boardsurfr said..sailquik said..
The WGPSSRC rules have been updated, in 2016, with the addition of the newer (GW52) device and data retreival procedures for them. There is currently a problem with getting the updated rules onto the GPS-SS website.
The GW60 has not been officially added yet as we needed to evaluate it further. It will probably be added soon.
Top secret record rules - cool
. I checked the rules on the GPS3 site after reading Dennis' post, but it did not occur to me that posting updated rules might take more than a year.
sailquik said..
The GT-31 is still perfectly adequate for a 24 hr record at the very least, and 10 second and other records as well, as long as one accepts that they will incur a higher penalty for error deduction.
I imagine Dennis and Kato duking it out on Lake George next year, and one of them winning by a few km because he used a few GW-52s, the other GT-31s. But then, I've been told my sense if humor is a bit unusual
.
A bit more seriously - how to treat errors in 24 h attempts may deserve some discussion. With 5Hz and higher data rates, the calculated error pretty much disappears, which may be too optimistic (especially with GW-60s worn on the wrist). With > 400,000 data points at 5 Hz, the calculated error will be around or below 0.001 knots, which may be too optimistic. I have seen some device comparisons where the error estimates were too optimistic even for a nautical mile or 1 hour.
A simpler and more robust way would be to treat the results from the two devices (or sets of devices for GW-52 etc.) as the variables, and to calculate the standard deviation from these numbers. For Kato's tracks, that gives 0.002 knots (or 0.014%), the same number that GPSResults gives for "gaussian" error propagation. However, GPSResults reports a two standard deviations, IIRC. But even if you'd take three sigma to get 99.8% confidence, Kato's numbers would be darn close to 660 km.
Top secret rules? No, as I explained, that is not the case, and that is a very harsh characterisation.
The latest rules are available for any potential record candidates from me. But the most important thing is for potential candidates to contact myself or other committee members and discuss their plans.
I agree with you that a review of the error calculation rules for other than 10 second records is due. We had already begun that discussion before I received your recent email. We have provision in the rules to adjust the calculation method if we agree there is a better way, and then adjust previous records accordingly.
I agree that the method we use for 5Hz and higher Hz devices appears to be possibly optimistic for longer time periods, and we welcome your considered suggestion for consideration.
I would be pleased to hear more from you or other interested people via email. These forums are not the place for that discussion.
, back to the focus - Well done Kato!!!! 
, I did go for a sail......for the cameras
