Might it be possible to include the easting/northing coordinates as well as the lat/long coordinates in the location field for installations in the app?
I encountered the situation today where my phone was completely failing to find my location, and I tried to use my GPS instead. Unfortunately, the GPS demanded its coordinates in easting/northing format, and the app was displaying the coordinates as lat/long. Standing in the middle of the bush with no internet is not when you want to be mucking around with coordinate system settings on a GPS (even assuming that the average fieldworker knows about these settings), and just having both sets of coordinates showing on the app display would avoid the whole problem.