The GPS coord is not an implemented feature for mapping purposes within AirWave (to my knowledge), it's there mostly as a way to record the lat/lon for the customers that want it (might have been an option within the MeshConfig system but that's been long EoS).
For the interface you may need to import the template and then tell AirWave to ignore that section, but honestly I haven't seen much MSR added to AirWave. Might check the user guide to see if it has a how-to or guide on adding MSRs.