GPS location error

Have you configered your GPS NMEA Output Datum to the software? The Raster 250K series is Auslig 1966 datum (unless you have the latest edition) where I believe the Magellan default setting is WGS 84. If you have set both to WSG 84 the software should correct the map settings automatically, otherwise set it to the Auslig Datum. Don't forget that the map series is over 35 years old & tracks marked on there are not necessarily in the same postion today. Also there is a magnetic north deviation correction as well.
I run a Magellan 320 with OziExplorer software & the early edition of the Raster Series Maps & have my datum set at WSG84 & have no problems with positions. I also run it on the HEMA Great Desert Maps Series with the same configeration without any position problems.
You can always email Des Newman at info@oziexplorer.com as he has helped me with some mapping problems in the past. Hope this helps.Have Wheels Will Travel

Did you calibrate the maps yourself or did you use the .map files from the ozieplorer web site.

If you did the calibration yourself grab the .map files from the oze web site they are very accurate. I have been using this program for a few years now and highly recomend it.

Dont the Yanks throw the GPS out when theres a war on ?

Dont think it would be that far out though !

DXJ - Just reload the correct .MAP files. A very easy mistake (I did it a few weeks ago!!) here is the official response from Oziexplorer:

The file you attached which "doesn't work" is a map file for the AUSLIG Release 2 Sydney map not a NATMAP.

You have installed the NATMAP files or the AUSLIG Release 2 Files, there are both these options on the current OziExplorer CD Installation options. (I assume you have a recent CD which has the NATMAP and the AUSLIG Release 2 files on it.)

Please check what you have installed.

The NATMAP files are installed to "NATMAP CD1" etc folders under the "Maps" folder.

The AUSLIG files are installed to "AUSLIG CD1" etc folders under the "Maps" folder