GPS Tech...accuracy

[scoota]

keith

get this one http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT
This is the GPS used by the guy who run HPR 135 @ topspeed 205km/h

Cool , nice find

[drwayne]

Eagle tree V4 GPS 'reads' 5Hz
can log motor rpm with cheap AD module.
useful because rpm Vs speed is a great tool to evaluate prop efficiency.
The waterproof Forerunner201 are not... store became tired me replacing under warranty.. refunded money, told me to go away !
haha

Scoota,.. you going to SAW2011 ?

W

[m4a1usr]

I dont think there's any question which method is more likely to glitch. There is an aspect of convenience to consider though. If I have to plant buoys an exact distance apart and time myself while driving every time I go to a pond, I just wont bother. Its a great method for events where a course can be set up for multiple members, but a bit impracticle for someone who just runs down to the nearest water to make some runs. Also, in instances with vehicles like my road cars, I usually use all the room I have to get up to speed. I dont normally have the room to run 120mph between two points for someone to time it.

Yep. I'm with you Keith. I dont know what I would do without my GPS units. Its the only reliable method I know of measuring improvements to hardware adjustements, changing props, adding a new motor, etc. I hope no one has taken any of my comments as anti-GPS. I use mine all the time. Its just a tool.

I have a couple of the Geko's (101 and 201). Cheap and work fine. The 101 has no data interface capability. The 201 does.

I also have a forerunner 305 which I think is the better of the three I own. Whats funny is if I put all three in a hull and run it. I will get at least 2 different top speed values. Thats why you hear me being so skeptical. And the fact that these units cannot be calibrated. Since I work in the scientific community, where everything literaly gets calibrated to some standard, Well,..........you see why I am polarized. Good luck with your choice.

John