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damadeo
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Joined: Sep 20, 2007
Posts: 8
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 Posted: Tue Sep 25, 2007 8:12 pm Post subject: |
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| Trying to cover every possibility, I performed two hard resets. After the first one I installed the software through the SD card. No results. After the second one I did it onto the built-in memory. No results again. |
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midnight1
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Joined: Nov 22, 2007
Posts: 4
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| Posted: Thu Nov 22, 2007 8:14 am Post subject: |
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My PDA is : I-mate Jamin
Bluetooth reviever is : Globalsat BT338
I installed garmin Mobile XT and it's working fine but when navigate the position is wrong. I'm away of my real position about 150meter. I don't know why ?!!!!
Anybody has a solution? pls reply to my email.
Thank you |
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philpugh
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Joined: Dec 28, 2005
Posts: 2003
Location: Antrobus, Cheshire
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| Posted: Thu Nov 22, 2007 3:21 pm Post subject: |
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Consistent positional errors sounds like a wrong datum setting in your GPS receiver. Check it's set to WGS84.
_________________
Phil |
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midnight1
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Joined: Nov 22, 2007
Posts: 4
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| Posted: Thu Nov 22, 2007 5:14 pm Post subject: |
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| philpugh wrote: | | Consistent positional errors sounds like a wrong datum setting in your GPS receiver. Check it's set to WGS84. |
The DATUM is WGS-84 as written in Globalsat BT338 specification part on the user manual. I also put the same DATUM on garmin Mobile XT software !! but i still have position error.?!! |
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midnight1
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Joined: Nov 22, 2007
Posts: 4
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| Posted: Fri Nov 23, 2007 11:26 am Post subject: |
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| UP^^^^^^^^^^^^^^^^^^^^^^^ |
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midnight1
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Joined: Nov 22, 2007
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| Posted: Sun Nov 25, 2007 2:20 pm Post subject: |
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| ^^^^^^^^^^^^^^^^^UP^^^^^^^^^^^^^^ |
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philpugh
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Joined: Dec 28, 2005
Posts: 2003
Location: Antrobus, Cheshire
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| Posted: Tue Nov 27, 2007 2:55 pm Post subject: |
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| midnight1 wrote: | | philpugh wrote: | | Consistent positional errors sounds like a wrong datum setting in your GPS receiver. Check it's set to WGS84. |
The DATUM is WGS-84 as written in Globalsat BT338 specification part on the user manual. I also put the same DATUM on garmin Mobile XT software !! but i still have position error.?!! |
There will be two datums associated with the software. The datum of the received GPS signal (WGS-84) and the datum associated with the mapping (for Garmin maps this will be WGS-84 also) this is usually embedded in the mapping - or assumed in the case of maps locked to specific applications/manufacturer.
Now if you are still getting a consistent positional error (over a number of days) with all the datum set correctly, this is very difficult to explain. Temporary errors can be explained by poor satellite geometery - but for this size of error it would need some of the sats to be shielded from view - giving a one-sided view of the sky.
Check the position being reported by your GPS receiver against a known location (eg your house as featured on Google Earth).
_________________
Phil |
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