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07-26-2004, 10:09 PM
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Tracker
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Join Date: Dec 2001
Location: Saginaw County.
Posts: 109
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Speed
I am looking for imformation on the accuracy of GPS for correct speed at 25 to 35 mpg. thankyou toots P. S. for boating
Last edited by toots; 07-26-2004 at 10:11 PM.
Reason: Add for boating
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07-26-2004, 10:36 PM
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Administrator
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Join Date: Jan 2000
Location: The concrete jungle
Posts: 17,166
Photos: 325 
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That would depend a lot on your unit but I have found mine to be quite accurate when compared to my truck's speedometer.
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07-26-2004, 10:39 PM
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Moderator
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Join Date: Feb 2002
Location: MI
Posts: 5,390
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More GPS accuracy information than you'll know what to do with... http://www.edu-observatory.org/gps/gps_accuracy.html
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07-26-2004, 10:41 PM
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Michigan Sportsman
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Join Date: Jan 2001
Location: Rochester Hills, MI USA
Posts: 13,473
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I believe that GPS is very accurate. But in a boat, you've got to remember that the speed indicated is "over ground" speed. If you were headed into a strong current, your GPS speed would indicate your speed from point A to point B but your speed through the water would be greater. (because you're headed into the current) The opposite would be true once you turn around and head downstream with the current. Therefore using a GPS to gauge slower trolling speeds would not really be accurate due to the current but your "over ground" speed would be very accurate.
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It will take a LOT more than one bad season for me to abandon my beloved Maize & Blue!
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07-26-2004, 11:02 PM
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Charter Member
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Join Date: Dec 2000
Location: Lake Orion, MI
Posts: 1,324
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Found some info
toots,
I did a quick search and found some reasonable info. Looks like you can expect between 0.1mph and 0.5mph accuracy.
http://gpsinformation.net/main/gpsspeed.htm
Best Regards,
Byron
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07-30-2004, 08:14 PM
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Guide
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Join Date: Sep 2001
Location: Bay City
Posts: 428
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I have found it to be extreemly accurate for speed.
My son recently flew in from California and turned it on during the flight (maybe not good) put it near the window and got 538 mph! Wow, it even recorded at that speed. I heard they are accurate up to 700 mph.......
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07-30-2004, 09:20 PM
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Super Moderator
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Join Date: Nov 2000
Location: Macomb Co. and so close to the real world it almost let me in.
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I cant imagine why there would be any barrier to the upper end of speed accuracy. Mine reads its top speed ever as a whole 212 mph, and that was a seriously fast fly in trip......:O
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07-30-2004, 11:56 PM
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Tracker
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Join Date: Dec 2001
Location: Saginaw County.
Posts: 109
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Speed
Thanks for all your comments.We took the boat and trailed it at different speeds, all under 30 mpg. We found the GPS tobe within .2 to.4 for accuracy. No, we did pull any cranks. thanks again. toots
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