It turns out that the problem I mentioned in the above post wasn't the screen going blank but the ocean.

for some reason the GPS management in AMIdos intermittently drops the " - " from the longitude coordinate this has the effect of changing it from West to East of the prime meridian.

This problem seems to disappear by just using the Location service -

turn off GPS hardware support and enable "Location" in AMIdos
activate " location " in Windows 10 settings.


At the moment i don't know whether this method of location is good enough for Nextgen when actually driving a route.

( now using GPS over BT app - free)

image - matched dpi settings - amiduos / nextgen
Spoiler: laptop shot
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