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post #1 of 12 Old Sep 5th, 2009, 9:57 am Thread Starter
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GPS or Speedometer

Just purchased and installed my first GPS (Nav III Plus). While still at the bottom of the learning curve in regards to what this high tech toy will do I have question.

MPH on the GPS is different then what is shown on the speedometer. Speedometer is showing slower then the GPS. Which one is more accurate?

GPS is installed on a 2209 K1200 LT.

Thanks

2006 Triumph Tiger
2007 Kawaski 500 LTD
2009 BMW K 1200 LT


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post #2 of 12 Old Sep 5th, 2009, 10:46 am
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Re: GPS or Speedometer

Your GPS should be more accurate than your spedo...



John

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post #3 of 12 Old Sep 5th, 2009, 2:21 pm
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Re: GPS or Speedometer

Agreed, GPS speed is much more accurate, in general ... but your speedo should be reading FASTER than the GPS. Uncle Sap (sorry, Sam) allows speedo accuracy to be +10% and -0%. Did you reverse the slower/faster thing ???

- Bob

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post #4 of 12 Old Sep 6th, 2009, 8:12 am Thread Starter
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Re: GPS or Speedometer

Didn't reverse. At 60, GPS says 63.

Thanks to both of you for the input.

2006 Triumph Tiger
2007 Kawaski 500 LTD
2009 BMW K 1200 LT


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post #5 of 12 Old Sep 6th, 2009, 8:21 am
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Re: GPS or Speedometer

Since the age of GPS, on every BMW MC I have had, the speedo shows 5-8 MPH faster than actual measured GPS speed. On my 2000 LT for example a speedo 80 is a GPS 73.

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post #6 of 12 Old Sep 6th, 2009, 9:03 am
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Re: GPS or Speedometer

GPS should be spot on but I have never ever heard of amotorcycle speedo that was showed slower than actual before.

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post #7 of 12 Old Sep 6th, 2009, 10:51 am
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Re: GPS or Speedometer

Quote:
Originally Posted by LostInAlaska
GPS is installed on a 2209 K1200 LT.

Thanks
I think the time / space warp feature was standard on the 2209's so it would be tough to get any kind of accurate speed reading.


and yeah, my 2000 speedo reads 80 when the GPS reads ~73

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post #8 of 12 Old Sep 6th, 2009, 10:50 pm
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Re: GPS or Speedometer

My speedo is 3 mph more than my GPS.

Paul
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post #9 of 12 Old Sep 7th, 2009, 4:38 pm
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Re: GPS or Speedometer

My speedo is 7% - 8% faster than reality. The BC speed reading and the GPS reading are real tight at virtually all speeds and differ from the speedo by above mentioned variance. Check your speedo by setting the cruise control on a flat road at a specific speed on speedo, reset BC ave. speed while CC is engaged and check reading on BC vs speedo. BC should be more accurate.
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post #10 of 12 Old Sep 7th, 2009, 5:18 pm Thread Starter
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Re: GPS or Speedometer

All your comments have me thinking. Pretty sure mine speedo is slower then my GPS. GPS is currently packed away for my trip to the Lower 48. Renting a bike in S.F. and riding to the East Coast (another item to stike off my Bucket List) by the old Route 66.

Will test again upon my return in two weeks.

Again, thanks for the responses.

2006 Triumph Tiger
2007 Kawaski 500 LTD
2009 BMW K 1200 LT


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post #11 of 12 Old Sep 7th, 2009, 6:13 pm
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Re: GPS or Speedometer

Yours would be the first that I heard of where the Speedo was slower than the GPS. Believe the GPS regardless.

John
Quote:
Originally Posted by LostInAlaska
All your comments have me thinking. Pretty sure mine speedo is slower then my GPS. GPS is currently packed away for my trip to the Lower 48. Renting a bike in S.F. and riding to the East Coast (another item to stike off my Bucket List) by the old Route 66.

Will test again upon my return in two weeks.

Again, thanks for the responses.

John & Marilyn Fisher
'00 K1200LTC "Katie"
'95 Triumph "Tigger"
'12 Triumph 800XC "Tigger II" (RIP)
'12 Triumph 1200 Explorer "Shadow Tigger"
Hillsboro, Oregon

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post #12 of 12 Old Sep 16th, 2009, 11:52 pm Thread Starter
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Re: GPS or Speedometer

Update.

Just finished my San Francisco to Washington, DC trip. During this trip the GPS DID register faster then the speedo.

I have a theory of why (if I'm correct) the GPS registered a slower speed while in Alaska. My theory is either correct or I'm all wet to begin with (Speedo slower).

I get home Friday so I will test my theory on Saturday and bring an end to this thread either way.

2006 Triumph Tiger
2007 Kawaski 500 LTD
2009 BMW K 1200 LT


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