Whilst testing XnView MP vers0.21 I discovered that the Geo Coordinates for NEF files are listed incorrectly. Upon further checking, I discovered that this error is also exhibited in XnView vers 1.96.5. Versions previous to 1.96.5 had displayed correctly but I don't know when the error first occurred.
The following image illustrates the error with the XnView listing and the correct coordinates as displayed by EXIFTool:

Thanks for the latest releases.
Regards
PETER