Quote:
Originally Posted by Toyorelle
Has anyone noticed a big gap between your boat speedometer and a GPS? I've noticed as much as a 10mph difference and was wondering which was more accurate? I am assuming the GPS since it is accurate on the road. It is an auto GPS (Nuvi 350) with the Garmin winnepesaukee map on it. Looking forward to hearing if anyone else has noticed this.
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Yes, boat speedometers are notorious for being off. Since most of them work on water pressure there are many variables which can affect an accurate reading. A GPS is extremely accurate at determining your speed.
As an fyi,... My boat speedometer get progressively more inaccurate as I go faster. Between 10 and 20 mph my speedo is relatively accurate, but when I speed up to say 50 mph on my GPS, my speedometer on the boat reads 55 mph.
Dan