Gyrocompasses - SailNet Community
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post #1 of 17 Old 05-27-2007 Thread Starter
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Gyrocompasses

Are gyrocompasses coming to the general sailing community? Perusing the Sperry web-site, I see they have a new unit that weighs in at 45 kg and consumes around ten amps. Progress is being made.

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post #2 of 17 Old 05-27-2007
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How about this instead? Weight: 1.5 kgs.

ComNav Marine Ltd. - Vector G2 Specifications
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post #3 of 17 Old 05-27-2007
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I always wondered why Inertial navigation systems haven't been developed.
Other than gyros being bulky and very expensive. I guess its just to easy to build circuit boards and transmiters then shoot them into orbit. I'd like to see what they have in in subs.

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post #4 of 17 Old 05-27-2007
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Val-

That's not a gyro compass, and is dependent on getting GPS satellite signals, which isn't always reliable. They do make some very nice, fairly compact and low power draw laser-based gyrocompasses... but the price tag isn't for the faint of heart.

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post #5 of 17 Old 05-27-2007
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On subs, we have at least two of everything. Radar, GPS, gyro, satnav, etc. Sometimes we have them in triplicate. Oh yeah, and we have sonar too (in various flavors.) I can't give you any technical specs, but not only do we have every navigational aid known to man, but "Redundancy" is our watchword.
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post #6 of 17 Old 05-27-2007
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How about just one or two of theses and do it like my dad, and his dad, and his dad's dad and so on....they allways came home.....ask Magalhães, and Cabral, and Vasco da Gama etc.....



Simple, almost fool proof, marginal error and VERY LIGHT!!!!!

One in front of each wheel..simple...



In most cases that is just ******** sold to those with money and compulsory buying disorder....and those that love to load their boats with usless crap!!!

Like radars sold to boats that never leave the marina or do weekend sails aorund the bay....

Unless of course you need one to cross the Horn, at night in no lights during a fog.....most cases its USELESS oin a small sailboat!!!!!!!

My auto pilot has a flux gate one small and usefull, that is all I need. But if Otto is off, it serves no purpose, the good old compass serves me 100% of the time....

A good compass is where I get really critical and demanding...Its very very important for me. I got the best available the Olympic 135 series from Plastimo, and a handheld tactical compass. All you need really. Everything else is sales man ********.

Last edited by Giulietta; 05-27-2007 at 10:41 AM.
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post #7 of 17 Old 05-27-2007
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Gyro's and inertials all suffer from drift, so need some absolute reference system to correct them. Gyro compasses cleverly use gravity and the Earth's rotation but are really only needed in huge steel ships with magnetic field problems.
Giu is right, magnetic compasses are really all a plastic boat sailor needs for direction finding. However, GPS really makes life simple. Watch for some MEMS inertial/GPS hybrids entering the market (at about 10k$), which is about a tenth of the current kit. Useful for those guys with wings, and the artillery.
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post #8 of 17 Old 05-27-2007
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Quote:
Originally Posted by sailingdog
Val-

That's not a gyro compass, and is dependent on getting GPS satellite signals, which isn't always reliable. They do make some very nice, fairly compact and low power draw laser-based gyrocompasses... but the price tag isn't for the faint of heart.
I know, but I didn't realize that the idea was that a gyrocompass was so desirable in a boat when compared to satellite, magnetic or fluxgate like a KVH AC103 (I have the last two, plus a late '90s chartplotter and two handheld GPSes and a pelorus..so I think I'm covered.)

I mentioned the "satellite GPS compass" only in the context of autopilot systems: I am currently figuring out what would work best with my hydraulic steering, and the ComNav products are on my short list. I can't figure out if this Vector G2 is even necessary when there are newer "black box" solid-state compasses coming out that are probably just as good at providing headings to a below-decks autopilot.

So who needs a gyro the size of a microwave?
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post #9 of 17 Old 05-27-2007
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I'm with Giuletta. I've lived with gyrocompasses (USN) and they aren't appropriate for vessels that do not require numerous repeaters and consistent heading info for fire control.

A little handheld GPS is much more useful on a sailboat.

For instantaneous heading data, I watch my man Ritchie instead.
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post #10 of 17 Old 05-27-2007
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Quote:
Originally Posted by Valiente
So who needs a gyro the size of a microwave?
EXON VALDEZ!!!!!!!!!!
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