GB2504995A - GPS anchor drag monitoring system - Google Patents

GPS anchor drag monitoring system Download PDF

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Publication number
GB2504995A
GB2504995A GB201214699A GB201214699A GB2504995A GB 2504995 A GB2504995 A GB 2504995A GB 201214699 A GB201214699 A GB 201214699A GB 201214699 A GB201214699 A GB 201214699A GB 2504995 A GB2504995 A GB 2504995A
Authority
GB
United Kingdom
Prior art keywords
anchor
monitoring system
drag monitoring
boat
anchor drag
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB201214699A
Other versions
GB201214699D0 (en
Inventor
Robert John Hartley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PARTNERS FOR ENDOSCOPY Ltd
Original Assignee
PARTNERS FOR ENDOSCOPY Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by PARTNERS FOR ENDOSCOPY Ltd filed Critical PARTNERS FOR ENDOSCOPY Ltd
Priority to GB201214699A priority Critical patent/GB2504995A/en
Publication of GB201214699D0 publication Critical patent/GB201214699D0/en
Priority to PCT/GB2013/052185 priority patent/WO2014027210A1/en
Publication of GB2504995A publication Critical patent/GB2504995A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/22—Handling or lashing of anchors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/24—Anchors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
    • B63C7/00—Salvaging of disabled, stranded, or sunken vessels; Salvaging of vessel parts or furnishings, e.g. of safes; Salvaging of other underwater objects
    • B63C7/26—Means for indicating the location of underwater objects, e.g. sunken vessels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B2021/003—Mooring or anchoring equipment, not otherwise provided for
    • B63B2021/009—Drift monitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/22—Handling or lashing of anchors
    • B63B2021/225—Marker buoys for indicating position of an anchor, or for providing a line connection between the anchor and the water surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2213/00—Navigational aids and use thereof, not otherwise provided for in this class
    • B63B2213/02—Navigational aids and use thereof, not otherwise provided for in this class using satellite radio beacon positioning systems, e.g. the Global Positioning System GPS

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Emergency Alarm Devices (AREA)

Abstract

A system for monitoring the drag of a boat's anchor 2 comprises a buoyant body 8 for housing a GPS receiver. A securing line 10 is attached to the body and is configured to connect the body to an anchor 2 such that the body is able to float on the surface of a body of water when connected to the anchor. A GPS receiver is provided that is associated with the body for receiving a global positioning satellite GPS signal 12. A processor is configured to generate location data indicative of the location of the body based on the received UPS signal. This location data is used to determine when the buoyant body has moved outside a predetermined perimeter that is indicative of the boat 1 having drifted, and an alert signal is generated if such a determination is made.

Description

ANChOR DRAG MONITORING SYSTEM The present invention relates to an anchor drag monitoring system, and in particular an anchor drag monitoring system for alerting a user when an anchor drags outside a s predetermined perimeter.
Anchor drag is a known problem experienced by boat owners. Where a boat has moored and dropped anchor the moored position of the boat is reliant on the anchor remaining in a fixed position. If the anchor should be dragged from its original position this will result in the boat drifting from its original moored location which could cause the boat to collide with other moored vessels or to drift onto rocks, against a harbour wall or numerous other hazards which could cause damage to the boat or danger to occupants of the boat or other vessels. When alerted to anchor drag the boat cati be operated to rectifr the problem.
However, if the boat operator is sleeping on the boat or on shore away from the boat they may not be aware that anchor drag is occurring.
It is known to provide systems which monitor the position of the boat and alert the boat operator if the boat drifts away from a predetermined location perimeter. However, given that boats experience a certain degree of drift under normal conditions in which the anchor is not dragged, due to the distance between the boat and the anchor, such monitoring systems must allow for a relatively large drift distance before activating an alert. As such, such a system may not react to anchor drag until the boat has drifted a significant distance.
It is therefore desirable to provide an improved system for monitoring anchor drag which addresses the above described problems and/or which offers improvements generally.
According to the present invention there is provided an anchor drag monitoring system as described in the accompanying claims.
3C In an embodiment of the invention there is provided an anchor drag monitoring system comprising a buoyant body; a securing line attached to the body and configured to connect the body to an anchor such that the body is able to float on the surface of a body of water when connected to the anchor; a receiver associated with the body for rceeiving a global positioning satellite (UPS) signal; a processor configured to generate location data indicative of the location of the body based on the received UPS signal; and means for determining on the basis of the location data when the body has moved outside a predetermined perimeter calculated and for generating an alert signal if such a determination is made.
It is not possible to locate a UPS receiver directly on an anchor as the UPS signal is unable to bc rcccivcd through a body of water. As such, when the anchor is submerged no UPS signal would be able to be received by any device mounted directly to the anchor, and similarly no signal transmitted from the dcvice would be able to travel through the water to a remote receiver. The buoyant body maintains the UPS receiver in a position en the surface. This ensures that the UPS signal is able to reach the receiver.
The location of the buoyant body on the surface of the water corresponds directly to the lateral position of the anchor beneath., By monitoring the position of the anchor via the buoyant body, rather than monitoring the position of the boat, the system of the present invention is more immediately responsive to anchor drag and doesn't include the system lag which is introduced when the position of the boat rather than the anchor is monitored.
In a further advantage, thc location monitoring dcvicc of the anchor drag system that is secured to the anchor provides a secondary security function by permitting the location of the boat to be identified should the boat be stolen. While boats commonly include such systems on board, these may be known to a thief wlio may di sable the system before stealing the boat, whereas the secondary anchor mounted system is unlikely to be immediately evident and may therefore go unnoticed and remain operational.
The processor is preferably configured to generate start position data indicative of the position of the body when the anchor is first deployed and wherein the alert signal is generated based on said start position data. Once the anchor has been dropped and the buoyancy device deployed the initial position is logged and provides the initial reference point from which future movement is referenced.
The predetermined perimeter maybe calculated relative to the start position of the buoyant body. Any movement from this initial start position is compared to the maximum drift perimeter to calculate whether an alert is required.
The predetermined perimeter is preferably defined as a circle having a predetermined radius relative to the start position. More complex perimeters may alternatively be utilised.
In one embodiment the perimeter may be calculated based on known geographical/location data relating to the position of the boat such a structural features of a harbour, rocks, mooring positions of other boats or an other objects/structures which may present collision hazards.
An automatic deployment and retraction means may be provided which is configured to automatically deploy the securing line when the anchor is dropped and retract the securing line when the anchor is retrieved. The automatic deployment and retraction means biases the securing line to a stowed position and permits the line to deploy as the anchor drops.
The biasing means is preferably a coil spring.
The securing line is preferably deployed by the buoyancy force of the body. The buoyancy force of thc body and the retraction for of the biasing means are selected such that the buoyancy force is sufficient to overcome the retraction force to allow the buoyant body to float to the surface.
The tension of the automatic retraction means is configured to accommodate for tide rise and faJl but to prevent drift of the body and maintain it in a position substantially vertically above (he anchor.
The perimeter is preferably adjustable by user interface device. This enables the user to selectively vary the perimeter depending on mooring conditions.
Means for transmitting data between the body and a hand held mobile device may be provided, wherein the hand held mobile device is configured to generate the alert signal to indicate to the user when the body as moved outside the predetermined perimeter.
Preferably the hand held mobile device is configured to determine whether the anchor has dragged outside the predetennined perimeter based on location data transmitted from the buoyant body, and to generate the alert signal when such a determination is made to indicate to the user when the body as moved outside the predetermined perimeter.
S
The mobile device is a preferably a mobile telephone and the data is transferred via a mobile telephone network.
The present invention will now be described by way of example only with reference to the following illustrative figure iii which: Figure 1 shows an anchor drag monitoring system according to an embodiment of the present invention Referring to Figure 1, a boat 1 is provided with an anchor 2 that is secured to the boat 1 by a chain 4. The anchor 2 is a weighted body which is cast overboard to maintain the boat in a fixed location by virtue of the weight of the anchor 2 and its engagement with the seabed 6. The position of the boat 1 is further maintained by the engagement of the chain 4 with the seabed. The length of the chain 4 is such that when anchored the boat 1 may be located anywhere within a circular perimeter P having a radius defined by the maximum horizontal distance r of the boat from the anchor 2. The horizontal drag force resulting from the engagement of the anchor 2 and the chain 4 with the seabed 6 resists drift of the boat 1 outside the perimeter P. Onboard anchor drag monitoring systems monitor the position of' a boat using an onboard UPS device. Such systems monitor the position of boat rather than the anchor. Therefore, the onboard UPS anchor drag monitoring system must accommodate for a drift tolerance within an area of at least r2 before the alarm is activated with this being area the boat may naturally drift within for a stationary anchor. The boat is therefore potentially able to drift a distance of 2r, the diameter of the circular drift tolerance area, before the alarm is activated. The anchor defines the centre of the drift tolerance area, but as its position is unknown to the onboard monitoring system it is possible that the starting position of the boat may be at the maximum distance r from the anchor rather than centred above it as assumed by the system. This being the case, if the boat then begins to drift in a direction away from the anchor any drift represents anchor drag rather than natural drift for a stationary anchor within the tolerance area. It is therefore possible that the anchor may drag a significant distance of 2r before the alarms is sounded. Typically the length of anchor chain deployed is around 4 times the mooring depth. Therefore, for a typical mooring depth of Sm the boat could potentially drift a distance of up to 35-4Cm dragging the anchor, which represents a significant risk of damage to the boat and harm to its occupants.
Therefore a system is provided to monitor the position of thc anchor 2 rather than the position of the boat I, thereby providing a more accurate and responsive indication of anchor drag.
A float 8 comprises a buoyant body configured to float on the surface of a body of water.
is A securing line 10 connects the float 8 to the anchor 2. The float 8 contains a GPS receiver and transmitter configured to receive GPS signals from a plurality of GPS satellites 12 and to transmit information relating to the position of the float 8 based on the GPS signals received, The OPS device is connected to and preferably contained within the body of the float 8 such that it is maintained substantially above the surface of the body of water to ensure that it is able to effectively receive the GPS signals and transmit the associated location data without interference from the water.
The securing line 10 secures at one end to the float 8 and at the other end to the anchor 2.
In one embodiment the securing line may comprise a fixed length line fixedly or reliably connected at either end. Preferably however a retractable line deployment device is provided. The retractable line deployment line includes retraction means which may be a coiled spring or any other suitable means arranged to hold the securing line 10 in a stowed position wound about a spool. The sprung spool biases the securing line 10 to the wound stowed position. The spool may be connected to either of the float 8 and the anchor 2 with the float being held in close proximity to the anchor 2 in the stowed position. As the anchor 2 is deployed into the water and sinks to the seabed 6 under its own weight, the buoyancy of the float 8 forces the float 8 to the surface. The line deployment device is configured such that as the float S is forced to the surface, this buoyancy force overcomes the biasing force of the spring to allow the spool to unwind and deploy the securing line.
The spring is configured such that the float 8 is able to rise and fall with the tide but to hold the line sufficiently taught such that the float is held substantially vertically above the anchor 2 and is not able to drift horizontally away from the location of the anchor. As such, the position of the float 8 is able to accurately represent the position of the anchor 2. The biasing action of the spring is such that as the anchor 2 is withdrawn from the watcr, the securing line is retracted until it is once again fully wound about the spool in the stowed position.
The spring biased line deployment device is therefore configured such that the float S is automatically deployed when the anchor 2 is dropped, and automatically refracted as the anchor 2 is withdrawn from the water. Is
The UPS transmitter/receiver of the float 8 is may be arranged to transmit a signal indicative of the location of the float 8 via a mobile telephone network. The signal is preferably configured to be received by a mobile telephone device such as a smart phone.
Ihe user interface on the mobile device may use the location signal to indicate to the user the location of the anchor, for example by integrating the location data with a map based application to provide a graphical marker on a map indicative of the anchor's location.
Software may be provided on the mobile device, which be a mobile telephone but may also be any hand held device configured to receive a data signal transmitted from the float 5, which is configured to determine when the anchor 2 moves outside of a predetennined perimeter. The perimeter may be a fixed predetermined perimeter. Alternatively the user may alter the perimeter value P depending on the mooring location. When it is determined that the anchor 2 has moved outside the perimeter P, an alert signal is generated to alert the user to the situation, thereby enabling them to take responsive action. Alternatively or in addition a signal may be generated to automatically initiate remedial action to prevent further anchor drag.
In an alternative cmbodimcnt processing of thc location data from the UPS receiverltransmitter may be conducted on a processor provided on the float 8. The processor of the float 8 may be pre-programmed to indicate the maximum drift perimeter and to calculate when the boat has drifted outside this perimeter due to anchor drag. An alert signal is then generated which could be transmitted to a mobile alter device carried by the user, which may for example be a mobile telephone or pager.
S
Whilst endeavouring in the foTegoing specification to draw attention to those features of the invention believed to be of particular importance it should be understood that the Applicant claims protection in respect of any patentable feature or combination of features hereinbefore referred to and/or shown in the drawings whether or not particular emphasis JO has been placed thereon.

Claims (4)

  1. CLAIMS1. An anchor drag monitoring system comprising: a buoyant body; a securing line attached to the body and configured to connect the body to an anchor such that the body is able to float on the surface of a body of water when connected to the anchor; a receiver associated with the body for receiving a global positioning satellite (UPS) signal; a processor configured to generate location data indicative of the location of the body based on the received GPS signal; and means for determining on the basis of the location data when the body has moved outside a predetermined perimeter calculated and for generating an alert signal if such a determination is made.
  2. 2. An anchor drag monitoring system according to claim I wherein the processor is eonfigurcd to generate start position data indicative of the position of the body whcn the anchor is first deployed and wherein the alert signal is generated based on said start position data.
  3. 3. An anchor drag monitoring system according to claim 2 wherein the predetermined perimeter is calculated relative to the start position of the body.
  4. 4. An anchor drag monitoring system according to claim 3 wherein the predetermined perimeter is defined as a circle having a predetermined radius relative to the start position 5, An anchor drag monitoring system wherein the further comprising automatic deployment and refraction means configured to automatically deploy the securing line when the anchor is dropped and retract the securing line when the anchor is retrieved.6. An anchor drag monitoring system according to claim 5 wherein the securing line is biased to a slowed position by a biasing means.7. An anchor drag monitoring system according to claim 6 wherein the biasing means is a spring.8. An anchor drag monitoring system according to claim 6 or 7 wherein the securing line is deployed by the buoyancy force of the body.9. An anchor drag monitoring system according to any one of claims 5 to 8 wherein the tension of the automatic refraction means is configured to accommodate for tide rise and fall but to restrict horizontal drift of the body and maintain it in a position substantially vertically above the anchor.is 10, An anchor drag monitoring system according to any preceding claim thither wherein the drift perimeter is adjustable via user interface device.11. An anchor drag monitoring system according to any preceding claim comprising means for transmitting data between the body and a hand held mobile device, wherein the hand held mobile device is configured to generate the alert signal to indicate to the user when the body as moved outside the predetermined perimeter.12. An anchor drag monitoring system wherein the mobile device is a mobile telephone and the data is transferred via a mohile telephone network.13. An anchor drag monitoring system substantially as hereinbefore described with reference to, and/or as shown in figure 1.
GB201214699A 2012-08-17 2012-08-17 GPS anchor drag monitoring system Withdrawn GB2504995A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB201214699A GB2504995A (en) 2012-08-17 2012-08-17 GPS anchor drag monitoring system
PCT/GB2013/052185 WO2014027210A1 (en) 2012-08-17 2013-08-16 Anchor drag monitoring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB201214699A GB2504995A (en) 2012-08-17 2012-08-17 GPS anchor drag monitoring system

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GB201214699D0 GB201214699D0 (en) 2012-10-03
GB2504995A true GB2504995A (en) 2014-02-19

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WO (1) WO2014027210A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2493390A1 (en) * 2014-03-26 2014-09-11 José Pelayo DEL RIEGO PALACIOS Device for the detection and warning of anchorage of anchors of anchors, and procedure for said detection and warning (Machine-translation by Google Translate, not legally binding)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10035566B2 (en) 2016-10-12 2018-07-31 Cutting Edge Innovations, Llc Multi-anchoring depth control system
CN112319700B (en) * 2020-11-17 2021-08-24 厦门天吴海洋科技有限公司 Anchoring method of mother ship without anchor machine
CN113562118B (en) * 2021-09-27 2022-03-29 南通军华船舶配件有限公司 High convenient ship anchor that receive and releases of stability

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1034293C2 (en) * 2007-08-27 2009-03-02 Janssen Prec Engineering B V Anchor position determining device for boat in sea, has global positioning system located in auxiliary body i.e. buoy floating above anchor, where global positioning system indicates position of receiver attached on boat

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CH659981A5 (en) * 1983-06-22 1987-03-13 Martin W Oettli Method for monitoring the drift of lying at anchor vessel and device for implementing the procedure.
AU3163384A (en) * 1984-08-06 1986-02-13 Oettli, M.W. Drift of an anchored vessel
DE3810084A1 (en) * 1988-03-25 1989-10-05 Herbert Walter Device for indicating the risk of drifting of water craft lying at anchor
DE20021739U1 (en) * 2000-12-21 2001-03-01 I For T Gmbh Motion and tilt monitoring device
JP4423364B2 (en) * 2003-11-04 2010-03-03 財団法人新産業創造研究機構 Anchorage monitoring system
NZ562819A (en) * 2007-10-26 2010-02-26 Brian Edward Michie A method of determining and monitoring a distance travelled by a marine vessel connected to anchor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1034293C2 (en) * 2007-08-27 2009-03-02 Janssen Prec Engineering B V Anchor position determining device for boat in sea, has global positioning system located in auxiliary body i.e. buoy floating above anchor, where global positioning system indicates position of receiver attached on boat

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2493390A1 (en) * 2014-03-26 2014-09-11 José Pelayo DEL RIEGO PALACIOS Device for the detection and warning of anchorage of anchors of anchors, and procedure for said detection and warning (Machine-translation by Google Translate, not legally binding)
WO2015144954A1 (en) * 2014-03-26 2015-10-01 Jose Pelayo Del Riego Palacios Device for detecting and warning in case of anchored vessels dragging anchor, and detection and warning method

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Publication number Publication date
WO2014027210A1 (en) 2014-02-20
GB201214699D0 (en) 2012-10-03

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