JP2005003652A - Water depth detection method and water depth detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To precisely suspend a contrivance connected to a fishing line delivered by a fisherman on a ship to the right fishing depth. <P>SOLUTION: This detection device comprises a water depth detection means 11, an arithmetic processing means 14 for inputting and processing a signal from the detection means 11, and a communication means 15 for transmitting a signal from the processing means 14 to the outside. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water depth detection method for detecting, for example, the depth position of a fishing device in water, and a water depth detection device that embodies this method.
[0002]
[Prior art]
In the case of fishing, it is a rule of thumb that identifying the layer of fish (hereinafter referred to as “tana”) leads to good fishing results. Therefore, the angler, for example, uses a boat for fishing. If you do, you will find tana from where you found out with a fish finder (hereinafter referred to as fish finder) equipped on the ship.
[0003]
By the way, Tana differs depending on the fish species, but in many cases it is a few meters above the bottom, or a few tens of meters above the bottom, and sometimes it can be determined that the fish is swimming in the fish finder. Sometimes we know the depth.
[0004]
On the other hand, there is a depth of water, for example, in the ocean, in many cases there is a flow of tide, and therefore the fishing mechanism (hereinafter referred to as the mechanism) thrown into the sea reaches the above tana. Experience also shows that the device is not positioned directly under the ship, either by being swept away or by tana.
[0005]
Therefore, for example, in the case where a mechanism is made to Tana obtained by fish hunting, an extra fishing line connected to the mechanism is used, for example, from a fishing reel (hereinafter referred to as a reel). Need to pay out.
[0006]
And, when the device is flown and the fishing line is drawn out obliquely, or when it is drawn out in a curved shape such as an S-shape, it is uncertain whether or not the device is in the tana accurately. You will not get good fishing results.
[0007]
Therefore, the information that can be learned from the fish finder is transmitted to the reel used by the angler on the ship with a transmitter equipped on the ship, or a small and lightweight transmitter is incorporated into the mechanism, and from this transmitter There is a proposal that the information is once received by the ship and is transmitted to the reel used by the angler on the ship by a transmitter (see, for example, Patent Document 1).
[0008]
Therefore, according to this proposal, it is possible to provide so-called timely information, that is, underwater information, to the reel used by the angler on the ship, and the angler can set a predetermined tana. It can be said that
[0009]
[Patent Document 1]
JP 2002-142623 A (Claim 1, Claim 3, Claim 4, Paragraph 0021, Paragraph 0024)
[0010]
[Problems to be solved by the invention]
However, in the above proposal, it may be pointed out that the structure of the reel is unnecessarily complicated.
[0011]
In other words, with regard to the proposal of transmitting information that can be learned by fish hunting to the reel used by the angler with a transmitter equipped on the ship, it is sufficient for the angler to directly input the information obtained by fish hunting directly to the reel. .
[0012]
Therefore, if only information that can be found by fish finder is input to the reel, there is no need to configure it to receive information from the outside, such as by installing a receiver, that is, the reel structure does not have to be complicated. I can say.
[0013]
On the other hand, in the above proposal, a small and lightweight transmitter is incorporated into the mechanism, and information from the transmitter is once received by the ship and transmitted to the reel used by the angler on the ship. However, even if the water depth is quite shallow, it is well known that it is not easy to transmit information by sending radio waves or ultrasonic waves into the water. I have to say that there is no feasibility for the proposal to transmit to the receiver on the ship using ultrasonic waves.
[0014]
The present invention has been made in view of such a current situation, and an object of the present invention is to accurately lower a mechanism connected to a fishing line fed by a fisherman on a ship to a predetermined tana, for example. In the case of shallow water, of course, there is water depth, for example, the water depth detection method that is optimal for expecting the improvement of versatility for use in the ocean, and the implementation of this method It is providing the water depth detection apparatus for doing.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, first, in the first configuration in the water depth detection method according to the present invention, basically, the signal from the water depth detection means for directly detecting the water depth is arithmetically processed by the arithmetic processing means, It is assumed that the signal processed by the arithmetic processing means is transmitted to the outside by the transmitting means.
[0016]
Therefore, since the place directly detected by the water depth detection means is processed by the calculation processing means and then transmitted to the outside by the transmission means, for example, the water depth that was actually set is not above the water but above the water surface. I can confirm.
[0017]
And the 2nd structure in the water depth detection method by this invention carries out the arithmetic processing of the signal from the water depth detection means which detects a water depth directly by an arithmetic processing means, and the signal which carried out the arithmetic processing by the arithmetic processing means outside by a transmission means It is assumed that the signal is transmitted, the signal from the transmitting means is received by the receiving means, the signal from the receiving means is arithmetically processed by the arithmetic processing means, and the signal arithmetically processed by the arithmetic processing means is displayed on the display means.
[0018]
Therefore, the place detected by the water depth detection means is processed by the processing means and then transmitted to the outside by the transmitting means, and the signal from the receiving means for receiving the transmitted signal is processed by the processing means. Then, since the calculated signal is displayed on the display means, the receiving means, the arithmetic processing means, and the display means are positioned on the ship, so that the water depth detected by the water depth detecting means, for example, the water depth that actually occurred Can be confirmed on the outside ship.
[0019]
Furthermore, in order to embody the above-described water depth detection method, the first configuration of the water depth detection device according to the present invention is basically the water depth detection means for directly detecting the water depth and the signal from the water depth detection means. It is assumed that there is an arithmetic processing means for performing arithmetic processing and a transmitting means for transmitting a signal from the arithmetic processing means to the outside.
[0020]
Therefore, for example, it is possible to know the water depth at which the device was actually worked above the surface of the water, and to provide the information obtained outside as information.
[0021]
And while a water depth detection means consists of a water depth sensor, the water temperature detection means which consists of a temperature sensor at this time, and the water flow detection means which consists of a water flow sensor may be provided side by side.
[0022]
Incidentally, it is preferable that the water flow sensor has a plurality of pressure sensors in series in the direction of the water flow, and the water flow can be calculated from the distance and the pressure difference between the pressure sensors in series.
[0023]
And the 2nd structure in the water depth detection apparatus by this invention is the water depth detection means which detects water depth directly, the arithmetic processing means which carries out arithmetic processing of the signal from this water depth detection means, and the signal from this arithmetic processing means is external Transmitting means for transmitting to the receiver, receiving means for receiving the signal from the transmitting means, arithmetic processing means for calculating the signal from the receiving means, and display means for displaying the signal from the arithmetic processing means. Suppose that
[0024]
Therefore, the water depth detecting means, the arithmetic processing means, and the transmitting means are positioned in the water, and the receiving means, the arithmetic processing means, and the display means are positioned on the ship, so that, for example, the actual water depth where the work has been made can be visually confirmed on the ship. it can.
[0025]
In the above-described water depth detection device, more specifically, the water depth detection means, the arithmetic processing means, and the transmission means are connected to the fishing line by the weight, the bait rod, the tenbin, or the fishing gear constituting the fishing mechanism. It is assumed that it is built in or connected to any of the tools.
[0026]
Therefore, it is not necessary to drop the water depth detection device into the water only to directly detect the actual water depth, and the actual water depth can be directly detected as long as the weight, the bait bowl, the tenbin, or the connector is in the water. .
[0027]
Further, in the above water depth detection device, it is assumed that the length of the fishing line fed out by the display means is displayed, the display means is provided on the reel, and the receiving means and the arithmetic processing means are incorporated in the reel.
[0028]
Therefore, by displaying the length of the fishing line delivered by the display means, the user can feed the fishing line based on the position displayed on the display means, and the display means is provided on the reel and received. Since the means and the arithmetic processing means are built in the reel, the angler who uses the reel can choose to dispose of the information displayed on the display means based on his / her own judgment. Will be able to make a good judgment.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on the illustrated embodiment. The water depth detection method according to the present invention is embodied by a water depth detection device as shown in FIG. Suppose that it has the detection part 10 which detects the condition of underwater, and more specifically, the display part 20 is electrically connected to the detection part 10 wirelessly as similarly illustrated. Yes.
[0030]
In the embodiment shown in FIG. 2, this water depth detection method is embodied when fishing from above the ship 1, for example, carp fishing. At this time, if viewed as a water depth detection device, a fisherman (not shown) The display unit 20 (see FIG. 1) is embodied on the reel 3 held by the fishing rod 2 used by Z.), and the device 5 connected to the tip of the fishing line 4 extending from the reel 3 to the fishing rod 2. The above-described detection unit 10 (see FIG. 1) is embodied.
[0031]
And in the water depth detection apparatus which embodies this water depth detection method, the detection part 10 and the display part 20 shall be electrically connected under radio | wireless, and the detection part 10 which was underwater is displayed. The information collected by the detection unit 10 can be input to the display unit 20 by bringing the mechanism 5 pulled up from the water close to the reel 3 on the ship 1.
[0032]
Therefore, the water depth detection method will be described below while describing the water depth detection device.
[0033]
Incidentally, although not shown in the drawings, the reel 3 has a reel 3 that has a reel of about 100 to 200 meters by rotating a spool by a manual operation using a handle or an automatic operation using an electric motor. It is formed in a well-known structure that allows the fishing line 4 to be fed out from the spool by releasing the stopper mechanism.
[0034]
In the case of carp fishing, for example, the device 5 is formed in a structure called a tenbin device shown in FIG. 3, and is connected to the fishing line 4 under the interposition of a connector 6 called twist back. Basically, it has a tenbin 51 and a food bait 52 suspended from the tenbin 51.
[0035]
At this time, although it is about the bait bait 52, in the illustration, the weight 52a is integrally connected to the so-called bait body of the bait bait 52. The weight 53 (see FIG. 4) may be suspended.
[0036]
As for the tenbin mechanism, in the case of the tenbin mechanism in the case of fishing without using the bait, as shown in FIG. 4, a weight 53 instead of the bait rod 52 is connected to the tenbin 51.
[0037]
Further, in many cases, when the tenbin mechanism is connected to the fishing line 4, as shown in FIG. 3, a connector 6 called untwisting is used, but at this time, the same untwisting structure is formed. However, as will be described later, a connector 7 (see FIG. 4) incorporating the detection unit 10 may be used.
[0038]
In addition, the thread | yarn which tied the fishing hook (not shown), ie, Harris H, is directly connected with the front-end | tip of the tenbin 51, or it connects by using twisted-back H1, a cushioning material (not shown), etc. .
[0039]
When the reel 3 and the work-in-progress 5 are formed as described above, it is important that the detection unit 10 in the present invention is formed so as to be able to detect the underwater situation effectively. First, the water depth detecting means 11 is provided, and in the drawing, the water temperature detecting means 12 and the water flow detecting means 13 are provided.
[0040]
At this time, as shown in the drawing, the water depth detecting means 11 is constituted by a water depth sensor, the water temperature detecting means 12 is constituted by a temperature sensor, and the water flow detecting means 13 is constituted by a water flow sensor.
[0041]
The water depth sensor may be composed of a water pressure gauge in view of its function. Therefore, according to the proposal of this water depth sensor, it is sufficient to use an existing water pressure gauge, and the water depth detection according to the present invention. It becomes possible to avoid incurring an unnecessarily high cost in the apparatus.
[0042]
If the place intended by the present invention is ignored, many boats 1 are equipped with a fish finder, and therefore the depth detection means in the present invention can be obtained from the fact that the fish finder can know the depth of the bottom and tana. It can be understood that having 11 has no meaning.
[0043]
However, since the water depth detection means 11 in the present invention detects the water depth that is actually in the water, for example, the mechanism 5 can detect the water depth that actually has a mechanism that cannot be known by fish hunting due to the water flow. It will be.
[0044]
If this is the case, it is meaningful to have the water depth detecting means 11 in the present invention in that the water depth can be known even when the fish finder is not operating in the ship 1.
[0045]
By the way, although what is called a thermometer is sufficient for a temperature sensor, there was no proposal about what can detect a water flow directly until now about a water flow sensor.
[0046]
Therefore, in the present invention, as an example, the water flow sensor has a plurality of (two) pressure sensors 13a and 13b in series in the direction of the water flow, as shown in FIG. The other pressure sensor 13b is arranged downstream of the water flow, and the water flow is calculated from the distance and the pressure difference between the two pressure sensors 13a and 13b.
[0047]
Therefore, according to the proposal of this water flow sensor, it is possible to detect a water flow by using a plurality of existing pressure sensors, so as not to incur a mischievous cost increase in the underwater condition detection device of the present invention. This is advantageous in that it can be performed.
[0048]
And the water flow detection means 13 which consists of said water flow sensor can enable the professional fisherman and the angler on the boat 1 to directly detect the water flow in Tana during actual fishing.
[0049]
Next, the detection unit 10 has an arithmetic processing unit 14 that receives and processes signals from the detection units 11, 12, and 13, and transmits a signal from the arithmetic processing unit 14 to the outside. Means 15 are provided.
[0050]
The arithmetic processing means 14 performs arithmetic processing on information as a signal input from each of the detection means 11, 12, 13 and inputs it as a signal to the transmission means 15, and is a processing unit 14a comprising a CPU that performs arithmetic processing. And a storage unit 14b composed of a RAM for temporarily storing results of arithmetic processing and instructions in the processing unit 14a.
[0051]
The transmitting unit 15 includes a main body 15a that is a communication module for inputting a signal from the processing unit 14a in the arithmetic processing unit 14, and an antenna that outputs a signal from the main body 15a toward the display unit 20 described later. It has an output part 15b.
[0052]
By the way, in this detection unit 10, since the arithmetic processing means 14 has the storage unit 14b, that is, the RAM, it is assumed that it has the power supply unit 16, that is, the battery, but when this RAM is not provided, Battery distribution can also be omitted.
[0053]
If the arithmetic processing means 14 does not have a RAM, the arithmetic processing means 14 simply outputs the information input from the detection means 11, 12, 13 to the communication means 15 as a signal. become.
[0054]
Therefore, the display unit 20 to be described later requires a RAM. However, from the viewpoint of the function of the display unit 20, it is indispensable to have a RAM. From this point of view, the detection unit 10 includes a RAM and a battery. Even if it is omitted, there is no problem.
[0055]
In addition, since it is possible to omit the RAM and the battery in the detection unit 10, it is possible to reduce the volume and the weight of the detection unit 10. Therefore, the detection unit 10 is distributed in the water. In view of this, it is advantageous in that it is easy to realize a reduction in size and weight.
[0056]
By the way, in this embodiment, the detection unit 10 formed as described above, that is, the water temperature detection unit 11, the water flow detection unit 12, the water depth detection unit 13, the arithmetic processing unit 14 and the detection unit 10 are formed. The transmission means 15 is incorporated in or connected to or held in any of the weight 53, the bait rod 52, the tenbin 51, or the connection tool 7 (see FIG. 4) for connecting the mechanism 5 to the fishing line 4 that constitutes the mechanism 5. It is said that it will be connected by such as.
[0057]
At this time, the tenbin 51 may easily stabilize the posture along the water flow from its shape and does not require special consideration, but the weight 53 or the bait bait 52 stabilizes the posture according to the water flow. Since it is not easy, it is not shown in FIG. 3 and FIG. 4, but it is preferable to attach a stabilizing plate to the weight 53, the weight 52 a in the soup bait 52, and further to the connector 7.
[0058]
Further, regarding the incorporation of the detection unit 10 in the tenbin 51, since the tenbin 51 is made of a wire in many cases, as shown in FIG. It is preferable to be incorporated in the dedicated capsule body 51a linked to the.
[0059]
As described above, since the detection unit 10 is built in or connected to the device 5, it is not necessary to drop the underwater condition detection device into the water only to detect the underwater condition. As long as the soup bait 52, the tenbin 51 or the connector 7 is in water, the situation in water can be detected sequentially.
[0060]
On the other hand, the display unit 20 transmits an underwater situation as information provided from the detection unit 10 to the angler on the ship 1. In this embodiment, the reel 3 used by the angler is finally used. It is said that it will appear in the liquid crystal panel part.
[0061]
Therefore, the display unit 20 includes a receiving unit 21 that receives a signal from the transmitting unit 15 in the detection unit 10, an arithmetic processing unit 22 that inputs and processes the signal from the receiving unit 21, and the arithmetic processing. And display means 23 for displaying a signal from the means 22.
[0062]
The display unit 20 includes a RAM that forms a storage unit 22b in the arithmetic processing unit 22 to be described later, and the display unit 23 performs so-called display display. It is said to have.
[0063]
The receiving means 21 inputs the signal from the transmitting means 15, that is, the signal from the transmitting section 15 b forming the transmitting means 15 to the arithmetic processing means 22 through the main body portion 21 a as a communication module. The receiving unit 21b as an antenna is connected to the unit 21a, and a signal is input to the receiving unit 21b via the transmitting unit 15b.
[0064]
The arithmetic processing unit 22 includes a processing unit 22a including a CPU that performs arithmetic processing on information that is a signal input from the receiving unit 21, and a RAM that temporarily stores arithmetic processing results and instructions in the processing unit 22a. And the storage unit 22b.
[0065]
Further, the display means 23 is for causing the display unit 23a composed of a liquid crystal panel to finally display the information required by the angler. The display unit 23a receives the signal from the arithmetic processing means 22 described above. Input from the output unit 23b.
[0066]
Therefore, in the display unit 20 formed as described above, underwater conditions can be visually recognized on the ship 1 when the receiving means 21, the arithmetic processing means 22 and the display means 23 are positioned on the ship 1. become.
[0067]
At this time, as shown in the figure, since the display unit 20 is displayed on the liquid crystal panel portion of the reel 3, the angler who uses the reel 3 can choose to discard information displayed at his / her own discretion. Become.
[0068]
In the display unit 20, the display unit 23 a in the display unit 23 may display the length of the fishing line 4 connected to the mechanism 5. In this case, the display unit 23 The fishing line 4 can be paid out based on the position displayed on 23a, and personal judgment can be made based on the displayed information.
[0069]
Also, in the figure, it is assumed that the display unit 20 is built in the reel 3. However, in view of the function of the display unit 20, instead of the illustration, it is not shown again, but from the reel 3. It may be displayed on a dedicated display device having a separated liquid crystal panel, and the dedicated display device is formed so as to be held on the rim of the ship 1 or is formed in a wristwatch shape. If so, the convenience will be improved.
[0070]
As described above, in the present invention, the underwater situation can be known, but at this time, the underwater situation is characterized in that it is obtained in the water, not from the remote ship 1, for example.
[0071]
In the above description, the detection unit 10 that constitutes the underwater condition detection device that embodies the underwater condition detection method according to the present invention is embodied in the tenbin mechanism in carp fishing. Other devices may be used as long as they are positioned on the tana.
[0072]
For example, in the case of using the tenor mechanism 5a or the turnip mechanism 5b in which the fishing hook is fixed to the weight shown in FIG. Part 10 will be embodied.
[0073]
【The invention's effect】
As described above, in the first aspect of the present invention, the portion directly detected by the water depth detection means is processed by the calculation processing means and then transmitted to the outside by the transmission means. The water depth can be confirmed above the external water surface, not in water.
[0074]
In the invention of claim 2, the place detected by the water depth detecting means is subjected to arithmetic processing by the arithmetic processing means and then transmitted to the outside by the transmitting means, and from the receiving means for receiving the transmitted signal. The signal is calculated by the calculation processing means, and the signal subjected to the calculation processing is displayed on the display means. Therefore, the receiving means, the calculation processing means and the display means are positioned on the ship, and are detected by the water depth detection means. For example, the water depth where the work was actually made can be confirmed on the outside ship.
[0075]
Further, in the invention of claim 3, for example, the depth of water that has actually been worked on can be known above the water surface, and the information obtained can be provided to the outside as information.
[0076]
At this time, the water depth detection means may be composed of a water depth sensor, a water temperature detection means including a temperature sensor, and a water flow detection means including a water flow sensor.
[0077]
Incidentally, it is preferable that the water flow sensor has a plurality of pressure sensors in series in the direction of the water flow, and the water flow can be calculated from the distance and the pressure difference between the pressure sensors in series.
[0078]
At this time, when the water flow sensor is used alone as a separate body from the water depth detection device, not only a so-called amateur angler on the boat but also a specialized fisherman directly detects the water flow in Tana during actual fishing. It may be possible to detect.
[0079]
In the invention of claim 4, the water depth detecting means, the arithmetic processing means, and the transmitting means are positioned in the water, and the receiving means, the arithmetic processing means, and the display means are positioned on the ship. You can see the actual water depth on board.
[0080]
At this time, the display means may be a liquid crystal panel portion in a reel held by a fishing rod used by a fisherman on board, and in view of the function of the display means, a liquid crystal panel separated from the reel is provided. It may be displayed on a dedicated display device, and in this case, if this dedicated display device is formed to be held on the rim of the ship, or if it is formed in a watch shape, Convenience is improved.
[0081]
In the invention of claim 5, it is not necessary to drop the water depth detection device into the water only to detect the actual water depth, and as long as the weight, the bait bait, the tenbin, or the connector is in the water, The water depth can be detected directly.
[0082]
In the invention of claim 6, since the water depth sensor as the water depth detecting means can be substituted with the existing water pressure gauge, it is possible to prevent the costly misuse of the water depth detecting device.
[0083]
Further, in the inventions of claims 7 and 8, by displaying the length of the fishing line that the display means feeds, the user can feed the fishing line based on the position displayed on the display means. Therefore, the display means is provided on the reel, and the receiving means and the arithmetic processing means are built in the reel, so that the angler who uses the reel can choose to discard the information displayed on the display means by his / her own judgment. In addition, personal judgment can be made based on the displayed information.
[0084]
As a result, according to the present invention, the water depth detection means can directly detect, for example, the water depth where the device is actually in operation, and the detected location is input to the reel used by the angler on the ship. This makes it possible to correct the length of the fishing line fed out from the reel, so that the device connected to the fishing line can be accurately moved to the tana and is suitable for use in the sea, for example, underwater. Ideal for expecting improved versatility.
[Brief description of the drawings]
FIG. 1 is a view showing in principle an underwater condition detection apparatus that embodies an underwater condition detection method according to the present invention.
FIG. 2 is a schematic diagram showing a situation in which an underwater situation detection device according to the present invention is used.
FIG. 3 is a diagram showing a tenbin mechanism that embodies a detection unit constituting the underwater condition detection device according to the present invention.
FIG. 4 is a diagram showing a tenbin mechanism having another structure.
FIG. 5 is a model diagram showing the structure of a water flow sensor.
FIG. 6 is a diagram showing a device having another structure.
[Explanation of symbols]
1 ship
2 Fishing rod
3 reel
4 Fishing line
5 Work in progress
5a Tenya work in progress
5b Turnip work
6,7 connector
10 detector
11 Water depth detection means
12 Water temperature detection means
13 Water flow detection means
13a, 13b Pressure sensor
14,22 Arithmetic processing means
14a, 22a processing unit
14b, 22b storage unit
15 Transmission means
15a, 21a body
15b, 23b output section
16, 24 Power supply
20 Display section
21 Receiving means
21b Input section
23 Display means
23a display
51 Tenbin
51a capsule body
52 Thatched Bait
52a, 53 weight
54,55 connector
H Harris
H1 twist back

Claims (8)

A water depth detection method characterized in that a signal from a water depth means for directly detecting water depth is processed by an arithmetic processing means, and a signal processed by the arithmetic processing means is transmitted to the outside by a transmission means. The signal from the water depth detection means that directly detects the water depth is processed by the processing means, the signal calculated by the processing means is transmitted to the outside by the transmitting means, and the signal from the transmitting means is received by the receiving means, A water depth detection method characterized in that a signal from a receiving means is arithmetically processed by an arithmetic processing means, and a signal arithmetically processed by the arithmetic processing means is displayed on a display means It has water depth detection means for directly detecting the water depth, arithmetic processing means for arithmetic processing of a signal from the water depth detection means, and transmission means for transmitting the signal from the arithmetic processing means to the outside. Water depth detector Water depth detection means for directly detecting the water depth, arithmetic processing means for arithmetic processing of the signal from the water depth detection means, transmission means for transmitting the signal from the arithmetic processing means to the outside, and reception of the signal from the transmission means A water depth detecting device comprising: a receiving means for performing processing; a processing means for processing the signal from the receiving means; and a display means for displaying the signal from the processing means. The water depth detection means, the arithmetic processing means, and the transmission means are incorporated in or connected to any of a weight, a bait rod, a tenbin, or a connector that connects the fishing mechanism to the fishing line. Item 5. Depth detector according to item 4 6. The water depth detection device according to claim 3, wherein the water depth detection means comprises a water depth sensor. The water depth detection device according to claim 4, wherein the display means displays the length of the fishing line fed out. The water depth detection device according to claim 4, wherein the display means is provided on the reel, and the receiving means and the arithmetic processing means are built in the reel.

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