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moaten
Occasional Visitor
Joined: Jun 10, 2006
Posts: 2
Location: Yateley - Hants
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 Posted: Sat Jul 08, 2006 10:43 pm Post subject: Nuvi - problem using National Grid Co-ordinates |
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Hi - I mailed Garmin about my problem and didn't get a reply, so some feed back on here would be great. ( It could be that I'm half brain dead and doing something wrong - pls say so if thats the case !! 
If I enter a location using the British National Grid co-ordinates it ends up showing the location in completley the wrong place. e.g TQ458277 is the location of the Airmans Grave on Asdown Forrest - my Nuvi shows it as being on the south coast near Climping !
Anybody else seen this problem ? |
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Skippy
Pocket GPS Verifier
Joined: 24/06/2003 00:22:12
Posts: 2946
Location: Escaped to the Antipodies! 36.83°S 174.75°E
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| Posted: Sun Jul 09, 2006 11:37 am Post subject: Re: Nuvi - problem using National Grid Co-ordinates |
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| moaten wrote: | | If I enter a location using the British National Grid co-ordinates it ends up showing the location in completley the wrong place. e.g TQ458277 |
That's not an uncommon mistake to make. The OS reference is accurate to 100 meters, the GPS is much more accurate than that so you have to write the reference differently.
What you have to do is add some zeros and enter it as TQ 45800 27700 or else it thinks you mean TQ 00458 00277 or something...
Good luck!
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Scarecrow
Lifetime Member
Joined: Jun 09, 2006
Posts: 185
Location: Kent
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| Posted: Sun Jul 09, 2006 6:27 pm Post subject: |
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| The other area for discrepancy, though not to the same scale, is that the National Grid system uses a different map to the one that GPS uses. OS is GB36 and GPS is WGS84 and there are differences between the two. |
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Skippy
Pocket GPS Verifier
Joined: 24/06/2003 00:22:12
Posts: 2946
Location: Escaped to the Antipodies! 36.83°S 174.75°E
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| Posted: Sun Jul 09, 2006 6:48 pm Post subject: |
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| Sorarse wrote: | | The other area for discrepancy, though not to the same scale, is that the National Grid system uses a different map to the one that GPS uses. OS is GB36 and GPS is WGS84 and there are differences between the two. |
Ahh, yes. You may need to select OSGB as a map datum (not WSG84)when using BNG references.
I think my Quest will automatically select OSGB if select the BNG grid format, but older GPS units used to allow you to select them independently and it caused a lot of confusion...
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moaten
Occasional Visitor
Joined: Jun 10, 2006
Posts: 2
Location: Yateley - Hants
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| Posted: Sun Jul 09, 2006 10:52 pm Post subject: |
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Cheers Skippy 
That certainly solves the problem for me.
Mike |
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planetnine
Regular Visitor
Joined: Dec 11, 2006
Posts: 93
Location: Lincolnshire, England.
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| Posted: Mon Dec 11, 2006 3:39 pm Post subject: |
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Skippy/Moaten,
i have a nuvi310 and i came up against the OS grid ref problem; how do you set the device to OSGB datum instead of WGS84?
currently if i ask it to give me GB grid references it takes its WGS Lat/Lon coords and applies an OSGB-to-grid-ref conversion on them resulting in errors of over 100 metres. (there's also a bug in which the coords are over 400m out until you've been to the coord format page, but that's another story)
i can't find any settings in the menus to do this and i need grid ref format to work, (else i'll have to get different hardware) any ideas? |
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Skippy
Pocket GPS Verifier
Joined: 24/06/2003 00:22:12
Posts: 2946
Location: Escaped to the Antipodies! 36.83°S 174.75°E
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| Posted: Mon Dec 11, 2006 6:02 pm Post subject: |
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| planetnine wrote: | | i have a nuvi310 and i came up against the OS grid ref problem; how do you set the device to OSGB datum instead of WGS84? |
In older units you could select them seperately (leading to confusion) but in the newer ones it should select the correct map datum automatically. 
It yours isn't doing this then perhaps there is a firmware upgrade you can get to fix the problem? Check Garmin's website and see if you have the latest version.
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planetnine
Regular Visitor
Joined: Dec 11, 2006
Posts: 93
Location: Lincolnshire, England.
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| Posted: Tue Dec 12, 2006 1:34 am Post subject: |
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Thanks for getting back to me Skippy, i think i have the latest firmware and, yes, i think it's supposed to set the transformations automatically, but i think it's got buggy firmware.
if you format the coordinate system to UK grid ref, any saved favourite locations have their position displayed as grid ref. if you switch the unit off and then back on again, the live current position and the favourites develop a 300-400m error on top of the normal conversion error, until you visit the coords format page again. whoops!
i know osgb grid ref is not the primary function of the 310, but i need it. garmin don't seem to want to discuss the matter. perhaps the uk slid a little further than realised on its european plate |
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