详细规格及用途描述

GM-739 is equipped with the u-blox 7 low-power, high-sensitivity engine. The dual-antenna design allows it to be flexibly used in various GPS environments.
An electronic antenna switch is built-in for automatic switch between built-in and external antennas. Antenna short-circuit protection prevents it from damage due to accidental human mistakes. GM-739 allows switching between GPS and GLONASS. It default works with GPS and QZSS.