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Reply to: Your boats top speed.

[quote=smfinley]I also believe the instantaneous speed measurements on the GPS's are not really accurate, and are less accurate the slower you are going. [quote]as for pin point accuaracy that's not as important when dealing with speed. Whether it knows exactly where you are or not it will still accurately depict your movement.[/quote] I do not agree with this suggestion. Since it is the pin point location that is used to calculate speed. If the accuracy is +/- 5 feet and you move 20 feet between readings. The GPS could read either you went 30 feet or you went 10 feet, that would be a huge speed difference. So the faster you go, the smaller the location accuracy error impact is. This is what allows average speed to be very accurate. This is also the reason behind adjusting the sample rate of the speed calculation. For a speed reading I think the average speed on a 5-10 minute reach would be much more accurate then the max speed your GPS reports.[/quote]

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