Re: Ozi Explorer on UK OS maps

Many thanks Craig and Dominic for explaining that OS maps Lat/Long
don't use WSG84 datum. I was able to rotate my map image so that
Lat/Long is parallel to the page, then used the cursor readout to
calibrate the map with the Lat/Long readings corresponding to OS grid
intersections. However, uploaded waypoints are still not right because
the shareware version doesn't allow anything other than WGS84. No doubt
I could convert the OS Lat/Long to WGS84 to calibrate the map as
Dominic suggests, but then the cursor readout would not correspond to
the map grid - too much confusion.

So on to evaluate GPSU as recommended by Neil. For a day I could not
understand why the program calibrated my map but was offset from the
screen coordinates, and gave no method of shifting the map. Then I
realised that GPSU understands other programs including Ozi, and must
have imported a calibration file from there. All I had to do was copy
my map image into the GPSU folder and rename it. Successful calibration
at last. Uploaded waypoints are correct. Granted the shareware version
only allows 10 points on a route, but at least the program can be tried
out, unlike Ozi.

Regards,
Dave Williams

.

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