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GPS calibration, is there such a thing?

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Old 09-05-2008, 02:41 AM
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My 07 prof. nav is always about 300 feet (100 meter) in accurate. Is there a calibration procedure?

For example, I've already arrived at my destination, but the nav still says I'm 100' away.

I have the 2008.2 USA DVD disc, but it happened with the 2007 discs also.
Old 09-05-2008, 06:25 AM
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The car constantly learns and although there is no calibration that you can perform there is a Secret Menu option that allows you to delete the learnt data and get the car to re-learn with the hope that this time you can teach it better.
Old 09-05-2008, 06:34 AM
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I've been amazed at how accurate my NAV GPS is.... within like 20' and refresh rate seems pretty frequent compared to my Garmin Nuvi in the truck... I don't know if there were upgrades in 2008 that make a difference,

Cal
Old 09-05-2008, 06:50 AM
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Bruce is correct. If you're looking for more informatin, the following threads may help you out:
http://forums.e60.net/index.php?showtopic=49489
http://forums.e60.net/index.php?showtopic=47906
http://forums.e60.net/index.php?showtopic=40647
Old 09-05-2008, 07:23 AM
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Thanks for all the info, I'll play around with it this weekend to see if it helps.

Tan
Old 09-05-2008, 07:57 AM
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Sometimes your civic address may not match that which is on the maps. Are you off for all addresses you put in? For example, my civic address is 15, but on my nav, I'm about 8 houses away. I corrected this by setting my 'home' as my 'current location' while parked in my driveway. Other addresses are fine though...just some of the really older streets or fairly new streets.

CLD
Old 09-05-2008, 09:50 AM
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Originally Posted by CLD' post='662649' date='Sep 5 2008, 11:57 AM
Sometimes your civic address may not match that which is on the maps. Are you off for all addresses you put in? For example, my civic address is 15, but on my nav, I'm about 8 houses away. I corrected this by setting my 'home' as my 'current location' while parked in my driveway. Other addresses are fine though...just some of the really older streets or fairly new streets.

CLD
Exactly right.....No GPS has the exact location of each address. It interpolates all the addresses from the addresses at various intersections or reference points. If you're right on the corner of the map intersection or reference address you'll be right on. If you're somewhere in between intersections or reference points then it's only approximate since it's interpolating the addresses in between evenly. Do this trick and your home address will be correct within the width of the driveway. One other thing....If you're off by 100' then the problem MAY be that you don't have enough satellites in view to be getting good data. Out of 24 satellites around the world your antenna need to be picking up three widely separated ones to get good two-dimensional data, four to get altitude. If you're driving in cities with big buildings or in the country with a lot of trees around you then your antenna may not be seeing enough satellites to get good triangulation.
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