I would like to know whether it is possible to convert the coordinates given in a NAV4 coordinates system into WGS84. I could not find out what NAV4 is and if it is actually a standardized CRS.
Here is an excerpt from the XML document which contains the coordinates:
<stop stopID="2309" name="Rasthaus" locality="Unterwittelsbach">
<place selected="0">
<placeID>36</placeID>
<placeName>Unterwittelsbach</placeName>
<OMC>9771113</OMC>
</place>
<coords>
<coordSystem>NAV4</coordSystem>
<longitude>4437685</longitude>
<latitude>788825</latitude>
</coords>
</stop>
Is there a EPSG reference which uniquely identifies NAV4? I could not see any helpful information in the document which help to identify the CRS used.