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Old 05-02-2011, 07:55 PM   #6 (permalink)
EcoModding Lurker
Join Date: May 2011
Location: US
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I think the GPS is a good idea. To add a layer of complication is the 'ground speed' verses 'indicated speed' issue. Similar to aviation, 100mph indicated is equal to 90mph ground speed with a 10mph head wind.

The river I navigate has a current speed of 2-5mph. So if I avoided the paddle wheel for VSS and went straight to GPS, then I would have more accurate MPG readings (since fuel burn is greater and efficiency is reduced traveling upstream.) This would also allow for some interesting trip MPG --(motor up river, float back down to the boat launch.) Though, while pulling a skier indicated MPG would be slightly more useful since it would remain constant upriver vs down river.

Thanks for the input so far.
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