As a broadcast engennier i do a lot of RF coverage measurements. The equipment i use have a flash ram and a build in GPS receiver connected to a external antenna. I drive from place A to place B with this unit and get the measurements into the flash. At office i download this TXT data files and using the especial DLL it draw the travel i made and place the data i want in pushpins over the map. This is why i sometimes might need other scale maps, let´s say a 1:25000, because there are small point to point measurements, i.e, only over the town, only outside the town, etc, etc.

Thanks
Vic