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Originally posted by Phil eltringham The problem with GPS is that the public band is only accurate to 40 meters (unless you pay the US army loads of money or get a cracked unit).  When Gallilao goes online in a few months its free service is accurate to about 40cm, and so would be far better for instantanious speeds.  Simon is right about the accuracy of 10 second+ plots, but it does look cool to be able to say you've hit 22 knots!!

 

Are you sure about the 40m Accuracy.  I am sure I read somewhere that they were now accurate to around 10m - Well my Garmin keeps telling me this !

The think the accuracy og GPS really depends on
who the USA are at war with at the present moment.
They have been known to deliberately make it wrong
(so the enemy drive off a cliff), whilst they still get the
ultra accurate information... Wonder if they'd ever do
that to opposition sailing teams in off shore sailing!!

The think the accuracy og GPS really depends on who the USA are at war with at the present moment. They have been known to deliberately make it wrong (so the enemy drive off a cliff), whilst they still get the ultra accurate information... Wonder if they'd ever do that to opposition sailing teams in off shore sailing!!

I think you have been reading a little too much fiction....

There is a published accuracy of 10m.  It will not be worse than this - if the US Army turned it down to (say) 500m we would have supertankers filling up the beaches !!!!!!!

having worked on and off in a local chandlery, i can safely say that someone has been wildly mislead here, the new wrist mounted GPS are very very VERY accurate, up to sppeds around 30 knots when it falls off slightly, and have been widely used around the club with an accurancy found to be within 2 meters, the average being 4 but never more than 7!!!! and as for the magellan meridian series, they are constantly accurste WITHIN 3 meters!!!!! so you may wish to dismiss anything else that source has published as fluen babble

those pictures on the link are EXTREME