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Thread: WGS84 and OSGB

  1. #1
    botogol Guest


    In the UK I normally like to keep my GPS set to OSGB, so it tallies with the OS Map that I would normally be carrying.

    When I'm entering a cache location from I therefore reset my GPS to WGS84, enter the lat/long coordinates, and then set it back. It's a bit tedious - do other people do this?

    But I also notice that gives a OS grid reference.. but one the one ocasion I used it, I found myself some distance away.... it didn't seem to tally...

    Am I right in thinknig that is giving an OS Grid reference, using the the WGS84 Datum? But is that a meaninful concept? Surely an OS Grid reference only makes sense with the OSGB datum...

    help please! :

  2. #2

    Join Date
    Jun 2003
    St Helens, Lancs, UK


    If you use the OS reference you should also use the OSGB datum. There are some errors in conversion but the biggest one is the omission of a leading zero in the OS grid reference. If there are only 11 digits in the reference, adding the appropriate leading zero usually puts it nearly right.
    Enjoy your caching!

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