The LMR Master is available with a built‑in GPS receiver feature (Option 31) that can provide latitude, longitude, altitude, and UTC timing information. This option also enhances the frequency reference oscillator accuracy in the Spectrum Analyzer mode. Within three minutes of satellite acquisition, the reference oscillator will have an accuracy of better than 50 ppb (parts per billion).

In order to acquire data from the GPS satellites, you must have line‑of‑sight to the satellites, or the antenna must be placed outside without any obstructions. An Anritsu GPS antenna is required.