New answers tagged utm
So it's been figured out. Apparently it's a format called MDV, which is an internal format used by the company providing this data. They nevertheless appear to be based on Gauß-Krüger coordinates, but only somewhat. As not noticed by me previously, the API does offer options for returning WGS84 coordinates as well, which fortunately makes this question ...
The MTM 1 coordinate system for Newfoundland (my guess) is found in he projected coordinate systems section, national grids then Canada and select your MTM zone. You can project these data into a UTM zone 22 keeping the same NAD83 datum between the systems
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