1) FastRawViewer display (selected/most) standard EXIF fields and a very limited range of non-standard/vendor specific (so called Makernotes) metadata.
The reason is simple: vendor specific metadata is neither officially documented, all interpretations is a guess (of unknown quality).
2) GpsImgDirection is standard field, but we have never been asked about this.
The reason is most likely simple: to record such data GPS receiver should contain electronic compass to determine direction without receiver movement.
Most/all cameras with GPS receiver(s) lacks it, while external receiver (you mentioned) may have such an ability.
If and when we'll have sample files with such tag in it and known approximate direction (East/West/South is enough) we'll implement this tag display in FRV.
1) FastRawViewer display
1) FastRawViewer display (selected/most) standard EXIF fields and a very limited range of non-standard/vendor specific (so called Makernotes) metadata.
The reason is simple: vendor specific metadata is neither officially documented, all interpretations is a guess (of unknown quality).
2) GpsImgDirection is standard field, but we have never been asked about this.
The reason is most likely simple: to record such data GPS receiver should contain electronic compass to determine direction without receiver movement.
Most/all cameras with GPS receiver(s) lacks it, while external receiver (you mentioned) may have such an ability.
If and when we'll have sample files with such tag in it and known approximate direction (East/West/South is enough) we'll implement this tag display in FRV.
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Alex Tutubalin/FastRawViewer team