If master units are set to nautical miles, and "Show Label" is set to true, it should format as something like "12.34 NM2" or "12.34 Sq.NM".
If master units are set to something other than nautical miles, you cannot format a distance/area/volume to use nautical miles, because as you already note that unit is not available in MstnPropertyFormatter schema.
If you knew the UORs-per-meter for the model containing the property, you could use the Conversion Factor and Suffix properties of your formatter to fake it.
Regards,
Paul
If master units are set to something other than nautical miles, you cannot format a distance/area/volume to use nautical miles, because as you already note that unit is not available in MstnPropertyFormatter schema.
If you knew the UORs-per-meter for the model containing the property, you could use the Conversion Factor and Suffix properties of your formatter to fake it.
Regards,
Paul