Sounds like a good idea Hardie,
but might be hard to police "wave sailor", using wave gear for ocean distance? or doing a string of half gybes to count as bottom turns? Maybe just start with altitude catergory.
Can we use our existing Navi GT GPS's? or would we all need US$500 Shadow Box devices for some form of accuracy and validity?
How accurate are the S'Box's?
Would they also be able to be used for record attempts in GPSSS? in conjunction with a Navi?
A single unit that does all is what is needed,
does the S'Box do this? does it have a dual chip set? 50hz etc?
For wave sailing I would prefer not to have a device strapped to my arm/body, I like the idea of the S'Box device mounting on deck using mast foot plate. One could easily make a plate to hold a suitable device in its waterproof case, as long as it had clearance from getting crushed from mast base. ie mount close and in front of uni-joint.
I'll leave it up to the Tech Heads to debate a comparison with the Shadow Box device re performance, accuracy, and cost against others if available and maybe a new device that Tom is working on and maybe its ability to record required data, it may need air pressure and temp added to it though to assist with accurate altitude measurement........
www.gps-speedsurfing.com/default.aspx?mnu=forum&forum=193&val=19874Navi 50Hz....
"50Hz instrument, which can be described as "5 instruments in one", all fitting into a single GT31 case:
1. two (2) independent GT31 chipsets with firmware, sharing one SD card
2. three (3) accelerometers along 3 orthogonal axes, sampling at 50Hz each (150 acceleration measurements per second), logging to SD card.
Single SBN file from this instrument contains GPS data from 2 independent GT31 chipsets plus 3 sets of 50Hz acceleration data. "