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Old 05-02-2011, 10:42 PM   #8 (permalink)
dcb
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pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

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the boat already has a speedometer? What sort of signal is it? That might be the simplest solution.

While of course you *could* compare indicated to made-good, nobody is asking for it and you would have to get programming to make sense out of it, for an individual user.

I think if there is a "digital" speed signal on the boat, see if we can use that, else gps up a speed signal is the pragmatic approach. gps would give a reading more in-tune with what us lubbers would consider mpg.
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