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GPS accuracy

Created by yoyo yoyo  > 9 months ago, 9 Mar 2009
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yoyo
yoyo

WA

1646 posts

9 Mar 2009 3:06pm
From sail rocket site.

"It took some time to get the accurate results post processed off the TRIMBLE GPS to see what we really did down the mile the other day. In fact we only got the results back yesterday afternoon. Here they are...

Peak speed- 46.75 knots off Trimble

Best 500 meter- 45.75 knots off Trimble

NAUTICAL MILE AVG- 41.09 knots off Trimble

(Kilometer AVG- 43.35 off Trimble)

(interestingly, these numbers varied quite a bit in some instances from those taken off the GT-11 hand held units which are preferred by some other speed sailors with craft too small to carry the TRIMBLE. In the case of the 500 meter average it was by over 1.7 knots!!! * I for one would be interested to see a test carried out using all three systems simultaneously i.e. A TRIMBLE, a range of hand-helds and a good old fashioned fixed wheel unit. It could be done on land on a runway.)

So all this means that we did our second best 500 meter average... but that the Mighty Dunkerbeck still has the Walvis course record by 0.07 knots over the mile. We are exactly 2 knots off Hydroptere's time. It remains a worthy time and a good benchmark for us.
"

* My emphasis
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