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09-20-2008, 06:17 AM
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#1
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Ensign
Join Date: Sep 2008
Posts: 10
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Hi folks,
I've recently read somewhere about the existence of "GPS anchors" available on some pleasure craft. Whereas I understand the concept behind this wonderful development, I would love to hear comments on it from those of you who may have had first hand experience with it.
As a corollary, would something like this be worth installing as a retrofit? I have no idea of the costs involved in acquiring such stuff.
Thanks in advance.
- MP
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09-20-2008, 07:06 AM
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#2
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Admiral
Join Date: Oct 2004
Posts: 3,067
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Hello MP,
I guess you are taking about the Fortress - which in fact has been around for some ten years at least. CascadeGPS
----------------------------------------
This link will take to discussions in our forums on anchors - including the fortress.
ANCHORS
If you have more questions - please come back here.
Richard
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09-20-2008, 12:50 PM
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#3
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Ensign
Join Date: Sep 2008
Posts: 10
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Hi Richard,
Quote:
Originally Posted by MMNETSEA
I guess you are taking about the Fortress - which in fact has been around for some ten years at least. CascadeGPS
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Afraid not Richard. What i read was a system that utilized GPS satellites to "lock" a boat's position with a computer controlling throttles & thrusters to maintain position. No physical anchor was required.
- MP
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09-20-2008, 01:29 PM
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#4
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Admiral
Join Date: Oct 2004
Posts: 3,067
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Well, if you had only mentioned that in the first place!
How does this 'system' function when everyone on our cruising yacht has furled the sails - turned the engine off - and is enjoying a quiet dinner in a peaceful anchorage?
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09-20-2008, 01:33 PM
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#5
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Retired Mod
Join Date: Mar 2007
Home Port: Durban
Posts: 2,984
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What about wind-shift/swell-shift, etc.? Could get really uncomfortable.
Give me an anchor anyday!
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09-20-2008, 03:10 PM
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#6
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Ensign
Join Date: Sep 2008
Posts: 10
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Quote:
Originally Posted by MMNETSEA
Well, if you had only mentioned that in the first place!
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Sorry guys, just trying to understand a technology that I've briefly chanced upon ...
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09-20-2008, 03:25 PM
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#7
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Retired Mod
Join Date: Mar 2007
Home Port: Durban
Posts: 2,984
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I think that the simple answer may well be that this technology would not be suitable for a cruising yacht. Interesting concept though!
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09-20-2008, 06:25 PM
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#8
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Rear Admiral
Join Date: Feb 2006
Posts: 437
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I'm certainly no expert, but...
I believe what we're talking about here is "Dynamic Positioning" a system which has been around for quite some time for station keeping. All are now interfaced with GPS. It's a method to keep a powerful vessel in one spot by use of computer controlled thrusters and main propulsion system.
Commonly used on research & oilfield vessels but completely inappropriate for a sailing vessel as it requires a ship-load of energy to "hover" in one spot for any length of time. I can immagine dynamic positioning as a new & trendy accessory on some of the newer lulury yachts as an aide for landing helicopters or fishing or watching sunsets or whatever it is the filthy rich do while idling away their time at sea.
GPS sure is a helpful tool for setting-up an anchor watch... especially when working in conjunction with a chart plotter.
To life!
Kirk
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09-20-2008, 09:55 PM
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#9
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Admiral
Join Date: Sep 2005
Posts: 1,619
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I worked with DP systems a while back on a multi-support vessel. We used it when divers were down working on the seabed around platforms in the North Sea. GPS was not accurate enough nor was it safe enough for this kind of work so we placed a transponder on a rig and used that to as the DP's referance point.
As for the filthy rich - well that is a lifestyle I know nothing about nor am I likely to.
Aye // Stephen
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09-21-2008, 04:59 PM
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#10
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Ensign
Join Date: Sep 2008
Posts: 10
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Hi Kirk,
Quote:
Originally Posted by Gallivanters
I believe what we're talking about here is "Dynamic Positioning" a system which has been around for quite some time for station keeping. All are now interfaced with GPS. It's a method to keep a powerful vessel in one spot by use of computer controlled
<snip>
newer lulury yachts as an aide for landing helicopters or fishing or watching sunsets or whatever it is the filthy rich do while idling away their time at sea.
GPS sure is a helpful tool for setting-up an anchor watch... especially when working in conjunction with a chart plotter.
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Firstly, thanks for the explanation. Makes sense.
However, I don't completely agree that it's only for the "filthy rich" ... the article I chanced upon was for a 40' yacht that offered a joystick control with GPS anchor as an option. The craft was running IPS engines and no thrusters.
Perhaps this technology is derived from really expensive systems that used to be installed on mega yachts or ships, but only in concept. I think the advance in computers has made it much more accessible to smaller boats.
My two cents worth ...
Thanks.
- MP
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12-27-2008, 05:24 AM
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#11
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Ensign
Join Date: Dec 2008
Posts: 23
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I saw one vessel using this system in Bermuda in October, 2007. The boat was Octopus owned by Paul Allen. WARNING - the link to to a PowerPoint.
Jack
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As I sail, I praise God, and care not. (Luke Foxe)
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12-27-2008, 12:28 PM
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#12
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Admiral
Join Date: Jul 2004
Posts: 2,098
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I'm just curious as to the reason that a cruising yacht would want such a system. *Run one's engines to stay in one place when dropping an anchor is less complicated, quieter, and somewhat less prone to failure. *Who wants to sit in one place for several hours with a noisy engine running if there's an alternative - i.e., anchoring?
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12-27-2008, 07:04 PM
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#13
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Admiral
Join Date: Sep 2005
Posts: 1,619
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In my case, Jeanne, we used the DP system in about 300 feet of water, where anchoring would not have worked due to the scope of the rode as the diving bell would not remain sufficiently stable to ensure the safety of the divers.
Aye // Stephen
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12-27-2008, 07:14 PM
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#14
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Moderator
Join Date: Jun 2007
Home Port: Washington DC
Vessel Name: SV Mahdee
Posts: 3,236
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Interesting technology for a MOTOR cruiser or commercial vessel. As far as I can see, totally inappropriate for a SAILING cruiser. Anchoring in deep water is indeed difficult and staying in one location might be appropriate for a mission-driven trip (e.g. scientific research or commercial endeavors) but makes little sense for the cruiser.
If the cruiser wishes to stay in a general locale of very deep water without making way...well, one can pretty easily heave to, right? Yes, there's drift with it but it does work pretty nicely and doesn't use any energy
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