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 Re: Rock art on your gps 71 messages | Select a forum: |
Megalithics wrote: tiompan wrote: The diffrence in is probably due to the use of two different datums .GE uses WGS84 and I think Magic uses OSGB 36 which is more likely to agree with the datum set on your GPS . Yes, that may be the reason, we extract OSGB grid refs from magic as we personally find these more "user friendly" than lat long. When stuck with GE only we take the lat/long and use OSGB converter to make the ref "human readable". This is interesting, might be an idea to take averaged gps readings at a clearly identifiable location using both datums/grid schemes and then compare them with readings obtained from Magic/GE and also from in-GPS datum conversion. The degree of fit between the two datums will probably vary with location though, so some points will give greater errors than others. Maggie & Keith Another factor is the altitude of the site and whether the gps is set for MSL (mean sea level ) or WGS geoid . When referring to a gps reading it might be worthwhile stating the datum it is set to . Reply | with quote |  3rd August 2010ce 20:16 In reply to: Re: Rock art on your gps (Megalithics) |
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