Gps, Mph, & Ae
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Post Fiend
Joined: Mar 2007
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From: Texas
Gps, Mph, & Ae
I picked up a portable GPS (Tom Tom) for the wife on Friday because I'm having to drive all over South Texas this week and could use it myself just to see how it works (turned out to be a good thing when I got re-routed from San Antonio to Victoria)
I noticed the GPS disagrees with my speedo by about 2 - 3 mph. Anyone know how accurate the speed on these GPS units are? Should I try and use the new AE feature that lets you change tire sizes to adjust my speedo to make them both match?
If so, what do I need to input in the AE? I'm running stock 265/75/16, and the truck is 2 - 3 mph faster than the GPS unit.
I noticed the GPS disagrees with my speedo by about 2 - 3 mph. Anyone know how accurate the speed on these GPS units are? Should I try and use the new AE feature that lets you change tire sizes to adjust my speedo to make them both match?
If so, what do I need to input in the AE? I'm running stock 265/75/16, and the truck is 2 - 3 mph faster than the GPS unit.
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Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
Thanks Greg. What's got me wondering is I've heard in the past that these trucks are off a little, and I got the upgrade to change my speedo for free. So if the GPS is right I figure why not. If it's wrong, I'd rather not screw with it.
Post Fiend
Joined: Jun 2004
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From: Parker, CO
If so, what do I need to input in the AE? I'm running stock 265/75/16, and the truck is 2 - 3 mph faster than the GPS unit.
Go to the website of your tire manufacturer. Look up the tire specs and find the exact overall diameter for your tire. For example, BFG A/T's in your size are 31.7" OD. AE calibrates in .25" increments, so you would push the arrow button until you see 31.75".
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Post Fiend
Joined: Mar 2007
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From: Texas
I was wondering that. The last time I was around any GPS stuff was when it was still a secret military only thing that was so large it had to be carried around in the new Hmmve's, and it took 2 of them to shoot an azymith to pinpoint the bad guys. This thing's not much bigger than a deck of cards.
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Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
Oops, forgot to answer this question.
Go to the website of your tire manufacturer. Look up the tire specs and find the exact overall diameter for your tire. For example, BFG A/T's in your size are 31.7" OD. AE calibrates in .25" increments, so you would push the arrow button until you see 31.75".
Go to the website of your tire manufacturer. Look up the tire specs and find the exact overall diameter for your tire. For example, BFG A/T's in your size are 31.7" OD. AE calibrates in .25" increments, so you would push the arrow button until you see 31.75".
Great idea with the speed trap sign. I've seen those a million times. How much you want to bet I won't see one for 6 months now?
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Posting Guru
Joined: Feb 2004
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From: IOWA
Boy, we gotta get you guys out on the farm!! There is GPS technology available giving us +/-1" accuracy from one pass to the next, and it'll drive the tractor too!! You just sit back and watch!
I'd trust the GPS moreso than your truck. Or average it out and be close.
I'd trust the GPS moreso than your truck. Or average it out and be close.
Posting Guru
Joined: Mar 2007
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From: East Peoria, IL
I agree with all of the above. My garmin nuvi750 is dead on with my speedo that I corrected. It also matches all the speed trap signs like curtis goes through 
I have also had someone pace next to me. I have even had 2 gps units, my garmin and another tom tom, when me and my buddies went on a road trip. They were exactly on together as well. Its correct
I have also had someone pace next to me. I have even had 2 gps units, my garmin and another tom tom, when me and my buddies went on a road trip. They were exactly on together as well. Its correct
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Post Fiend
Joined: Mar 2007
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From: Texas
If you are working your fields that fast I need to get some pointers from you, because 5 - 7 mph is about the fastest I can do anything light duty.
Post Fiend
Joined: Sep 2006
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From: Sioux Falls, SD
Oops, forgot to answer this question.
Go to the website of your tire manufacturer. Look up the tire specs and find the exact overall diameter for your tire. For example, BFG A/T's in your size are 31.7" OD. AE calibrates in .25" increments, so you would push the arrow button until you see 31.75".
Go to the website of your tire manufacturer. Look up the tire specs and find the exact overall diameter for your tire. For example, BFG A/T's in your size are 31.7" OD. AE calibrates in .25" increments, so you would push the arrow button until you see 31.75".
Thanks!