The modular design of the APS-3 allows maximum flexibility in product use to maximize the return of survey equipment investment. The product is compact and lightweight, with all wireless modules completely internal for ultra portability. For ease of use and simplicity, the APS-3 is completely configurable from the data collector via Bluetooth for either Base or Rover operation with the internal UHF radio, or for Network Rover operation with the internal cellular modem. The powerful multi-frequency AsteRx receiver provides GPS, GLONASS & SBAS as standard with every APS-3, as well as the option for GALILEO and Compass.