... GPS, GSM antenna, more easier installation, water- proof, suitable for field installation on buoys - Inductive measuring with independent power supply, no ... data at a fixed period of time- Remote monitoring: GPS location, battery voltage, light current and on/off status- Can set up ... : -30- 85 Deg C- Working temperature: -15 – 70 Deg C. Remote monitoring and control system for Aids to Navigations