JP2016074236A - Tailwind direction display device in sailing yacht sailing and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tailwind sailing direction display device which can display an optimal sailing direction according to wind direction and wind velocity, and a program.SOLUTION: A tailwind sailing direction display device 1 is equipped with: a wind direction acquisition part 11 for acquiring a wind direction indicated by an azimuth direction as an angle of a base line, which extends in a cross direction, with respect to a magnetic meridian; a wind velocity reception part 12 for receiving a wing velocity; a storage part 40 for storing a sailing angle table which stores a sailing angle formed between an optimal sailing direction when wind is blown along the base line and the base line every wind velocity; a sailing angle determination part 13 which determines a sailing angle in a wind velocity based said wind velocity with reference to the sailing angle table; a sailing direction azimuth calculation part 14 which calculates an azimuth of a sailing direction from the sailing angle determined by the sailing angle determination part 13 and a wind velocity; a display control part 15 which so controls as to display the azimuth of the sailing direction on an input/output part 30.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a tailwind sailing direction display device and a program for reaching a leeward target in the shortest time during tailwind sailing (windward sailing) in a sailing yacht.

  Conventionally, a sailing yacht is sailed by a mast and a boom, and sails by receiving wind from the sail. For this reason, in order to sail a sailing yacht quickly, it is necessary to adjust the sail so as to be in an appropriate position (direction) with respect to the wind direction.

Therefore, an anemometer for detecting the wind direction, an encoder for detecting the boom position, a boom driving means for rotating the boom, and a controller are provided, and the controller receives the signals detected by the anemometer and the encoder and receives the wind direction and the boom. An automatic yacht sail control device has been proposed in which the boom drive means is operated so that the angle between the two is maintained within a substantially constant range (Patent Document 1).
According to the automatic control device for a sail disclosed in Patent Document 1, the sail position can be appropriately adjusted, and the ship operator can perform an appropriate ship maneuver only by steering.

Japanese Patent Laid-Open No. 10-218084

However, even if the sailing yacht is adjusted so that the sail is in an appropriate position (orientation) with respect to the wind, depending on the sailing direction with respect to the wind direction, the sailing yacht may move away from the target position even if the boat speed increases. As a result, the arrival time at the target position is delayed.
In sailing yacht leeward sailing (race, etc.), it is ideal to run at an inclination (shift) of about 30 ° with respect to the wind direction, but this angle varies depending on the wind speed.

  In view of the above problems, an object of the present invention is to provide a tailwind sailing direction display device and a program that can display an optimum tailwind sailing direction (downwind navigation) according to the wind direction and wind speed.

(1) A tailwind sailing direction display device for displaying a sailing direction targeted by a sailing yacht,
A wind direction acquisition unit that acquires a wind direction indicated by an azimuth that is an angle with respect to a magnetic meridian of a reference line extending in the front-rear direction;
A wind speed reception unit for receiving wind speed;
A storage unit that stores a sailing angle table that stores, for each wind speed, a sailing angle that is an angle between the optimum sailing direction when the wind blows along the reference line and the reference line;
With reference to the sailing angle table stored in the storage unit, based on the wind speed received by the wind speed accepting unit, a sailing angle determining unit that determines the sailing angle at the wind speed;
A sailing direction azimuth calculating unit that calculates an azimuth of the sailing direction from the sailing angle determined by the sailing angle determining unit and the wind direction acquired by the wind direction acquiring unit;
A tailwind sailing direction display device during tailwinding, comprising: a display control unit that performs control to display on the display unit the orientation of the sailing direction calculated by the sailing direction orientation calculating unit.

According to the invention of (1), the tailwind sailing direction display device displays the sailing direction targeted by the sailing yacht, and the wind direction acquisition unit, the wind speed reception unit, the storage unit, the sailing angle determination unit, and the sailing direction An azimuth calculation unit and a display control unit are provided.

A wind direction acquisition part acquires the wind direction shown by the azimuth | direction which is an angle with respect to the magnetic meridian of the reference line extended in the front-back direction.
The wind speed reception unit receives the wind speed.
The storage unit stores a sailing angle table that stores, for each wind speed, a sailing angle that is an angle between an optimum sailing direction when the wind blows along the reference line and the reference line.
The sailing angle determining unit refers to the sailing angle table stored in the storage unit and determines the sailing angle at the wind speed based on the wind speed received by the wind speed receiving unit.
The sailing direction azimuth calculating unit calculates the azimuth in the sailing direction from the sailing angle determined by the sailing angle determining unit and the wind direction acquired by the wind direction acquiring unit.
The display control unit performs control to display the azimuth in the sailing direction calculated by the sailing direction azimuth calculating unit on the display unit.

Thereby, according to a wind direction and a wind speed, the azimuth | direction of the optimal sailing direction can be calculated, and it can display on a display part.
In steering a sailing yacht, a user uses a tailwind sailing direction display device in the following procedure.
First, the user aligns the tailwind sailing direction display device (reference line) with the wind blowing direction. At this time, the tailwind sailing direction display device acquires the wind direction indicated by the bearing.
Next, the user inputs the wind speed to the wind speed receiving unit by operating the touch panel or by an external device, for example.
When the wind speed is input, the tailwind sailing direction display device refers to the sailing angle table, determines the optimum sailing angle based on the wind speed received by the wind speed accepting unit, and calculates the direction of the sailing direction from this sailing angle. And displayed on a display unit (for example, a display).
The user steers the sailing yacht in the direction of the sailing direction displayed on the display unit.
Therefore, it is possible to provide a tailwind sailing direction display device that can display an optimum tailwind sailing direction (downwind navigation) according to the wind direction and wind speed.

(2) When the wind speed acquisition unit receives the wind speed at the wind speed reception unit, the wind direction acquisition unit fixes the wind direction,
The sailing angle determination unit determines the sailing angle only when the wind direction acquisition unit fixes the wind direction,
The sailing direction azimuth calculating unit includes the right sailing direction rotated to the right by the sailing angle with respect to the reference line, and the left sailing direction rotated to the left by the sailing angle with respect to the reference line; Respectively,
In the display unit, the display control unit
Control to display the wind direction acquired by the wind direction acquisition unit,
Until the wind direction acquisition unit fixes the wind direction, update the display of the wind direction to the value acquired by the wind direction acquisition unit at any time,
When the wind direction acquisition unit fixes the wind direction, the display of the wind direction fixed by the wind direction acquisition unit is fixed,
The tailwind sailing direction display device according to (1), which performs control to display the right sailing direction orientation and the left sailing direction orientation calculated by the sailing direction orientation calculation unit.

According to invention of (2), a wind direction acquisition part will fix a wind direction, if a wind speed is received in a wind speed reception part.
The sailing angle determination unit determines the sailing angle only when the wind direction acquisition unit fixes the wind direction.
The sailing direction azimuth calculating unit calculates a right sailing direction rotated to the right by the sailing angle with respect to the reference line and a left sailing direction rotated to the left by the sailing angle with respect to the reference line.
The display control unit controls the display unit to display the wind direction acquired by the wind direction acquisition unit, and updates the display of the wind direction to the value acquired by the wind direction acquisition unit at any time until the wind direction acquisition unit fixes the wind direction, When the wind direction acquisition unit fixes the wind direction, the display of the wind direction fixed by the wind direction acquisition unit is fixed, and the right direction sailing direction direction and the left direction of the sailing direction calculated by the sailing direction direction calculation unit are displayed. Do.

According to the invention of (2), since the wind direction is fixed by receiving the wind speed, the optimum direction of sailing direction can be calculated stably and displayed on the display unit.
Further, since the direction of the right sailing direction and the direction of the left sailing direction can be displayed, the user operating the sailing yacht appropriately selects the right or left sailing direction according to the target position and the wind direction, Can be steered.

(3) A computer that controls the tailwind sailing direction display device that displays the sailing direction targeted by the sailing yacht.
A wind direction acquisition unit that acquires a wind direction indicated by an azimuth that is an angle with respect to a magnetic meridian of a reference line extending in the front-rear direction;
A wind speed reception unit for receiving wind speed,
A storage unit that stores a sailing angle table that stores, for each wind speed, a sailing angle that is an angle between the optimum sailing direction when the wind blows along the reference line and the reference line;
With reference to the sailing angle table stored in the storage unit, a sailing angle determining unit that determines the sailing angle at the wind speed based on the wind speed received by the wind speed accepting unit;
A sailing direction azimuth calculating unit that calculates an azimuth of the sailing direction from the sailing angle determined by the sailing angle determining unit and the wind direction acquired by the wind direction acquiring unit;
A program that functions as a display control unit that performs control to display the azimuth of the sailing direction calculated by the sailing direction azimuth calculating unit on a display unit.

  According to the invention of (3), the same function and effect as those of the tail wind sailing direction display device of (1) can be obtained.

  According to the present invention, it is possible to provide a tailwind sailing direction display device and a program that can display an optimum tailwind sailing direction (downwind navigation) according to the wind direction and the wind speed.

It is a figure explaining the outline of the function of the tail wind sailing direction display device 1 concerning the embodiment of the present invention. It is a figure which shows the functional block of the tail wind sailing direction display apparatus 1 which concerns on this embodiment. It is a figure explaining the sailing angle table memorize | stored in the memory | storage part 40 which concerns on this embodiment. It is a figure explaining calculation of the direction of a sailing direction by sailing direction direction calculation part 14 concerning this embodiment. It is a figure which shows the tailing sailing direction display processing flow in the tailing sailing direction display apparatus 1 which concerns on embodiment of this invention. It is a figure which shows the example of a display in the input-output part 30 by control of the display control part 15 which concerns on this embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. In the description of the embodiments, the same components are denoted by the same reference numerals, and the description thereof is omitted or simplified.

FIG. 1 is a diagram for explaining an outline of functions of a tailwind sailing direction display device 1 according to an embodiment of the present invention.
In this embodiment, the tailwind sailing direction display device 1 is brought into a sailing yacht and displays the optimum sailing direction that can reach the target position earliest according to the wind direction and the wind speed.
In the present embodiment, the tailwind sailing direction display device 1 is configured by a smartphone. However, the present invention is not limited to this, and the tailwind sailing direction display device 1 may be a mobile phone, a personal computer, a tablet, or a dedicated device as long as it can acquire the direction. Or the like.

First, the tailwind sailing direction display device 1 (reference line L1) is aligned with the wind blowing direction. At this time, the tailwind sailing direction display device 1 acquires a wind direction α indicated by an azimuth that is an angle with respect to the magnetic meridian M of the reference line L1 extending in the front-rear direction.
Further, the tailwind sailing direction display device 1 receives the wind speed by a user operation, for example. In the present embodiment, the tailwind sailing direction display device 1 receives the wind speed by, for example, a user operation on a numeric key displayed on a touch panel of a smartphone, but is not limited thereto, and is output from an external wind speed measuring device. Information indicating the wind speed may be received.

  The tailwind sailing direction display device 1 refers to the sailing angle table that stores the sailing angle θ that is the angle between the optimum sailing direction and the reference line L1 when the wind blows along the reference line L1, for each wind speed. Then, the sailing angle θ corresponding to the received wind speed is determined.

  Then, the tailwind sailing direction display device 1 calculates the direction of the sailing direction from the determined sailing angle θ and the acquired wind direction α, and displays the direction of the sailing direction on a display unit (for example, a display or a touch panel of a smartphone). indicate.

  The user can sail in the optimum sailing direction that can reach the target position earliest by steering the sailing yacht in the direction of the sailing direction displayed on the display unit.

FIG. 2 is a diagram showing functional blocks of the tailwind sailing direction display device 1 according to the present embodiment.
The tailwind sailing direction display device 1 includes a control unit 10, a bearing acquisition unit 20, an input / output unit 30 as a display unit, a storage unit 40, and a position information acquisition unit 50.

  The control unit 10 includes a wind direction acquisition unit 11, a wind speed reception unit 12, a sailing angle determination unit 13, a sailing direction azimuth calculation unit 14, a display control unit 15, and a log acquisition unit 16.

The wind direction acquisition unit 11 acquires the wind direction α (see FIG. 1) indicated by the azimuth that is an angle with respect to the magnetic meridian M (see FIG. 1) of the reference line L1 (see FIG. 1) extending in the front-rear direction. To do.
The azimuth acquisition unit 20 can use a known electronic compass, and is composed of, for example, a pair of magnetic sensors that detect weak geomagnetism, and the pair of magnetic sensors are arranged at right angles.
The wind direction acquisition unit 11 detects geomagnetism from the direction acquisition unit 20 (a pair of magnetic sensors), detects the north direction (magnetic meridian M) from the strength, and detects the detected magnetic meridian M and the reference line L1. Is calculated.

For example, usually, in a smartphone, the reference line L1 extends in the front-rear direction and is arranged at the center. The user matches the front-back direction of the tailwind sailing direction display device 1 configured with such a smartphone to the direction in which the wind is blowing. Thereby, the wind direction acquisition part 11 acquires the wind direction (alpha). Specifically, the user turns the tailwind sailing direction display device 1 upward. And the wind direction acquisition part 11 calculates the angle of the magnetic meridian M and the reference line L1, adds 180 degrees to this calculated angle, and acquires the wind direction (alpha).
In the present embodiment, the wind direction acquisition unit 11 acquires the wind direction by using, for example, the direction acquisition unit 20 incorporated in the smartphone. However, the present invention is not limited thereto, and information indicating the wind direction output from an external wind direction measurement device. May be received.

Moreover, the wind direction acquisition part 11 will fix the wind direction (alpha) (refer FIG. 1), if the wind speed reception part 12 mentioned later receives a wind speed.
Specifically, the wind direction acquisition unit 11 fixes the acquired wind direction α when the wind speed reception unit 12 receives the wind speed. For example, the wind direction acquisition unit 11 does not acquire the wind direction α until the received wind speed is cleared.

The wind speed receiving unit 12 receives the wind speed by a user operation in the input / output unit 30.
The input / output unit 30 is configured by, for example, a touch panel, and displays various images such as a numeric keypad image that can be operated by the user under the control of the display control unit 15 and accepts user input operations.

  The sailing angle determination unit 13 refers to the sailing angle table stored in the storage unit 40 and determines the sailing angle θ (see FIG. 1) at the wind speed based on the wind speed received by the wind speed receiving unit 12.

FIG. 3 is a diagram illustrating the sailing angle table stored in the storage unit 40 according to the present embodiment.
In the sailing angle table, when the wind blows along the reference line L1 (see FIG. 1), the sailing angle (°) that is the angle between the optimum sailing direction and the reference line L1 is a plurality of types of wind speeds (m ). The sailing angle table is associated with a smaller sailing angle as the wind speed increases.
In the sailing angle table, the same sailing angle is associated with wind speeds of 1 to 3 m (lower limit side), and the same sailing angle is associated with wind speeds of 13 to 19 m (upper limit side). .
In the present embodiment, the optimum sailing angle is an angle with respect to a wind direction set in advance from past sailing logs or the like, and is an angle in a direction in which the target position can be reached earliest.

  Returning to FIG. 2, the sailing angle determination unit 13 determines the sailing angle θ (see FIG. 1) only when the wind direction acquisition unit 11 fixes the wind direction. That is, the sailing angle determination unit 13 determines the sailing angle θ after the wind speed receiving unit 12 receives the wind speed.

The sailing direction azimuth calculating unit 14 calculates the azimuth in the sailing direction from the sailing angle θ determined by the sailing angle determining unit 13 (see FIG. 1) and the wind direction α acquired by the wind direction acquiring unit 11 (see FIG. 1). .
Specifically, the sailing direction azimuth calculating unit 14 rotates the right sailing direction rotated by the sailing angle θ to the right with respect to the reference line L1 (see FIG. 1) and the sailing angle θ by the left with respect to the reference line L1. The left sailing direction is calculated.

FIG. 4 is a diagram for explaining the calculation of the sailing direction heading by the sailing direction heading calculation unit 14 according to the present embodiment.
The sailing direction azimuth calculation unit 14 calculates the right-side sailing direction azimuth β by adding the sailing angle θ determined by the sailing angle determination unit 13 to the wind direction α acquired by the wind direction acquisition unit 11.
Further, the sailing direction azimuth calculation unit 14 calculates the left sailing direction azimuth γ by subtracting the sailing angle θ determined by the sailing angle determination unit 13 from the wind direction α acquired by the wind direction acquisition unit 11.

Specifically, for example, when the wind speed received by the wind speed receiving unit 12 is 8 m, the sailing angle determining unit 13 determines 10 ° as the sailing angle θ in the example of the sailing angle table shown in FIG.
For example, when the wind direction α received by the wind direction acquisition unit 11 is 135 °, the sailing direction azimuth calculation unit 14 adds the sailing angle θ (10 °) to the wind direction α (135 °). 145 ° is calculated as the direction β in the sailing direction on the right side.
The sailing direction azimuth calculating unit 14 calculates 125 ° as the azimuth γ in the left sailing direction by subtracting the sailing angle θ (10 °) from the wind direction α (135 °).

Returning to FIG. 2, the display control unit 15 uses the sailing direction azimuth calculated by the sailing direction azimuth calculating unit 14 (the right sailing direction azimuth β and the left sailing direction azimuth γ) as an input / output unit. The control to display in 30 is performed.
Specifically, the display control unit 15 performs control to display the wind direction α (see FIG. 4) acquired by the wind direction acquisition unit 11 in the input / output unit 30 and until the wind direction acquisition unit 11 fixes the wind direction α as needed. When the display of the wind direction α is updated to the value acquired by the wind direction acquisition unit 11 and the wind direction acquisition unit 11 fixes the wind direction, the display of the wind direction α fixed by the wind direction acquisition unit 11 is fixed, and the sailing direction azimuth calculation unit 14 Control is performed to display the right-side sailing direction azimuth β (see FIG. 4) and the left-side sailing direction azimuth γ (see FIG. 4).

  When the input / output unit 30 receives a user's predetermined operation (for example, input of sailing yacht speed), the log acquisition unit 16 receives the wind speed received by the wind speed reception unit 12 and the wind direction acquired by the wind direction acquisition unit 11. α, the speed of the sailing yacht received by the input / output unit 30, the direction β of the right sailing direction calculated by the sailing direction azimuth calculating unit 14, the direction γ of the left sailing direction, and the tailwind sailing direction acquired by the position information acquiring unit 50 Log information in which the position information (latitude, longitude) of the display device 1 and the date and time when a predetermined operation of the user is performed is associated with each other is stored in the storage unit 40.

  The display control unit 15 displays log information on the input / output unit 30 in response to a predetermined operation by the user (for example, touch or swipe of a screen switching button displayed on the input / output unit 30 configured with a touch panel). Control.

The position information acquisition unit 50 receives a GPS signal from a GPS (Global Positioning System) satellite, and calculates position information based on the received GPS signal.
The position information acquisition unit 50 calculates position information and transmits the position information to the log acquisition unit 16 when a predetermined user operation (for example, input of sailing yacht speed) is received.

  Note that the functional blocks shown in FIG. 2 are merely examples, and one functional unit may be divided or a plurality of functional units may be configured as one functional unit. In each functional unit, a CPU (Central Processing Unit) built in the tailwind sailing direction display device 1 reads a computer program stored in a storage device such as a ROM (Read Only Memory) or a hard disk as a storage means, and the CPU The computer program executed by the computer reads and writes necessary data such as a table from a database (DB; Data Base) stored in a storage device or a storage area on a memory, and in some cases, related hardware (for example, This is realized by controlling an input / output device, a display device, and a communication interface device.

Next, the tailwind sailing direction display process in the tailwind sailing direction display device 1 according to the embodiment of the present invention will be described.
FIG. 5 is a diagram showing a flow of the tailwind sailing direction display process in the tailwind sailing direction display device 1 according to the embodiment of the present invention.

In step S1, the wind direction acquisition unit 11 uses the azimuth acquisition unit 20 to indicate the wind direction α (FIG. 4) indicated by the azimuth that is an angle with respect to the magnetic meridian M (see FIG. 4) of the reference line L1 (see FIG. 4) extending in the front-rear direction. Reference).
In addition, the display control unit 15 performs control to display the wind direction α acquired by the wind direction acquisition unit 11 on the input / output unit 30.

In step S <b> 2, the wind speed receiving unit 12 receives the wind speed by a user operation in the input / output unit 30.
In step S3, the wind direction acquisition unit 11 fixes the wind direction α (see FIG. 4) acquired in step S1.

  In step S4, the sailing angle determination unit 13 refers to the sailing angle table (see FIG. 3) stored in the storage unit 40, and based on the wind speed received by the wind speed receiving unit 12 in step S2, the sailing angle at the wind speed. θ (see FIG. 4) is determined.

  In step S5, the sailing direction azimuth calculating unit 14 determines from the sailing angle θ (see FIG. 4) determined by the sailing angle determining unit 13 in step S4 and the wind direction α (see FIG. 4) acquired by the wind direction acquiring unit 11. The right-side sailing direction azimuth β (see FIG. 4) and the left-side sailing direction azimuth γ (see FIG. 4) are respectively calculated.

  In step S6, the display control unit 15 inputs and outputs the right sailing direction azimuth β (see FIG. 4) and the left sailing direction azimuth (see FIG. 4) calculated by the sailing direction azimuth calculating unit 14 in step S5. Control to be displayed on the unit 30 is performed.

FIG. 6 is a diagram illustrating a display example in the input / output unit 30 under the control of the display control unit 15 according to the present embodiment.
With reference to FIG. 6, the usage method of the tailwind sailing direction display apparatus 1 is demonstrated.
First, the user aligns the mark 32a indicating the direction of the reference line L1 (see FIG. 4) in the direction in which the wind blows. Thereby, the display control part 15 displays the wind direction (alpha) (refer FIG. 4) which the wind direction acquisition part 11 acquired in the wind direction display 32. FIG.

Next, the user inputs the wind speed with the numeric keypad 36 and touches the ENTER button 38. Thereby, the wind speed reception unit 12 receives the wind speed, the wind direction acquisition unit 11 fixes the acquired wind direction α (see FIG. 4), and the display control unit 15 displays the received wind speed on the wind speed display 31.
The user can return the input wind speed to the initial state (for example, 00) by touching the clear button 37.

When the wind speed is input by the user and the ENTER button 38 is touched, the sailing angle determination unit 13 and the sailing direction azimuth calculation unit 14 execute the processes of steps S4 and S5.
Then, the display control unit 15 displays the left sailing direction azimuth γ (see FIG. 4) on the Port display 34 and the right sailing direction azimuth β (see FIG. 4) on the Starboard display 35.

The display control unit 15 may display a log screen on the input / output unit 30 when the user taps the screen switching button 39 or swipes the screen.
In this log screen, the display control unit 15 displays the wind speed, wind direction α, sailing yacht speed, right sailing direction azimuth β and left sailing direction azimuth γ, and position information stored in the storage unit 40 by the log acquisition unit 16. Log information such as date and time is displayed.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Following wind sailing direction display apparatus 11 Wind direction acquisition part 12 Wind speed reception part 40 Memory | storage part 13 Sailing angle determination part 14 Sailing direction direction calculation part 15 Display control part

Claims (3)

A tailwind sailing direction display device that displays a sailing direction targeted by a sailing yacht,
A wind direction acquisition unit that acquires a wind direction indicated by an azimuth that is an angle with respect to a magnetic meridian of a reference line extending in the front-rear direction;
A wind speed reception unit for receiving wind speed;
A storage unit that stores a sailing angle table that stores, for each wind speed, a sailing angle that is an angle between the optimum sailing direction when the wind blows along the reference line and the reference line;
With reference to the sailing angle table stored in the storage unit, based on the wind speed received by the wind speed accepting unit, a sailing angle determining unit that determines the sailing angle at the wind speed;
A sailing direction azimuth calculating unit that calculates an azimuth of the sailing direction from the sailing angle determined by the sailing angle determining unit and the wind direction acquired by the wind direction acquiring unit;
A tailwind sailing direction display device during tailwinding, comprising: a display control unit that performs control to display on the display unit the orientation of the sailing direction calculated by the sailing direction orientation calculating unit. When the wind direction acquisition unit receives the wind speed at the wind speed reception unit, the wind direction acquisition unit fixes the wind direction,
The sailing angle determination unit determines the sailing angle only when the wind direction acquisition unit fixes the wind direction,
The sailing direction azimuth calculating unit includes the right sailing direction rotated to the right by the sailing angle with respect to the reference line, and the left sailing direction rotated to the left by the sailing angle with respect to the reference line; Respectively,
In the display unit, the display control unit
Control to display the wind direction acquired by the wind direction acquisition unit,
Until the wind direction acquisition unit fixes the wind direction, update the display of the wind direction to the value acquired by the wind direction acquisition unit at any time,
When the wind direction acquisition unit fixes the wind direction, the display of the wind direction fixed by the wind direction acquisition unit is fixed,
The tailwind sailing direction display device according to claim 1, wherein control is performed to display the right side sailing direction heading and the left sailing direction heading calculated by the sailing direction heading calculation unit. A computer that controls the tailwind sailing direction display device that displays the sailing direction targeted by the sailing yacht.
A wind direction acquisition unit that acquires a wind direction indicated by an azimuth that is an angle with respect to a magnetic meridian of a reference line extending in the front-rear direction;
A wind speed reception unit for receiving wind speed,
A storage unit that stores a sailing angle table that stores, for each wind speed, a sailing angle that is an angle between the optimum sailing direction when the wind blows along the reference line and the reference line;
With reference to the sailing angle table stored in the storage unit, a sailing angle determining unit that determines the sailing angle at the wind speed based on the wind speed received by the wind speed accepting unit;
A sailing direction azimuth calculating unit that calculates an azimuth of the sailing direction from the sailing angle determined by the sailing angle determining unit and the wind direction acquired by the wind direction acquiring unit;
A program that functions as a display control unit that performs control to display the azimuth of the sailing direction calculated by the sailing direction azimuth calculating unit on a display unit.