Does anybody make a GPS unit that all it does is measure speed? I would like a small, portable unit to calibrate boat speedos.

Fred

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I have a little Garmin Etrex Legend that does a good job of giving me the speed. Its almost dead on from the tests I have given it. Not to mention its waterproof, and about 100 bucks!

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-Justin

91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd

it's automatic.

Radar guns work well if you just want speed over water.


Any cheap GPS should give you speed over ground, don't forget to account for currant...

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Uncorrected GPS can have positional errors of 3-10 m/sec. That is, the position reported could jump 3-10 meters in a second. If you need accuracy you are better-off with laser or Radar.

I was hoping to find a tiny hand held gizmo that would be really handy.

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