I won't pretend to be anything like an expert on all the different map reference protocols. Is there a good site anywhere,
Also any tools for converting say from Longditudte etc to OS references.
Lee D
OT: Map reference conversions
Sep 16, 2004
5 Replies
in article b7i2d.795$ snipped-for-privacy@newsfe2-win.ntli.net, Lee_D at snipped-for-privacy@lrproject.com wrote on 16/9/04 16:16:
I have just been messing about with my Garmin Etrex gps system and I can put in lat and long refrences and ,by switching the grid get OS refs out of it, if that is of any use.
- Rory Manton
- Oh gods , why me?
Thats the idea but I was hoping to use something of an Internet Link IYSWIM.
Lee D
I might have some code (probably C++) that could do the conversion. It might also be available in VB6. If interested, I'll have a look to see what I have.
Microsoft's MapPoint product can also do the conversion.
If you're looking at doing the conversion yourself, there's the gotcha that most GPS systems use the WGS 84 geoid for longitude/latitude, whilst Ordnance Survey use Airy '36 (iirc) for the national grid.
(WGS 84 is a better global fit, whilst Airy is historical for the OS and a better local fit for the UK).
Yes much of my day job is maps and GIS...
Richard Marsden
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Richard Marsden Winwaed Software Technology
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Go to
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and run NGR84, its easy to use. Peter.
Have you tried the Ordnance Survey site?
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more specifically:
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There's an on-line convertor here:
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(but it looks like an IE-only page!)Register here first:
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If you want something for your own PC try here:
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(Grid InQuest)Registration required and there are likely to be some restrictions on use for non-personal purposes. Link was found via the OS GPS site. David
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