Furuno GT-8031 16-channel GPS timing receiver module

The Furuno GT-8031 is a 16-channel GPS timing receiver module designed for precision time synchronization applications. It tracks up to 12 GPS satellites and 2 SBAS satellites simultaneously, outputs a 1PPS signal synchronized to UTC, and communicates over NMEA-0183. It shows up in telecom infrastructure, network timing equipment, frequency standards, and NTP/PTP server builds where GPS-disciplined timing is the requirement. Key Specs Channels: 16 (12 GPS + 2 SBAS simultaneous tracking) Signal: L1, C/A code Position Accuracy: 5.6m horizontal (typical), 7.3m vertical (typical) Time Accuracy: 30 nanoseconds (1PPS to UTC, typical) 1PPS Output: Yes, UTC synchronized Hot Start: 8.4 seconds Warm Start: 36 seconds Cold Start: 44.9 seconds Protocol: NMEA-0183 (approved and proprietary sentences) Baud Rate: Configurable Supply Voltage: 3.3V DC Interface: Serial (UART) SBAS: WAAS, EGNOS, MSAS supported Form Factor: PCB module Operating Temp: -40°C to 85°C (storage) The 1PPS output is what this module is actually used for in most applications. Position fixing is secondary. The 30 nanosecond 1PPS accuracy to UTC is what makes it useful in timing infrastructure, GPS-disciplined oscillators, and synchronization equipment from companies like Symmetricom, Datum, and Brandywine. If you have a timing server that originally used a Motorola M12 or M12+ and need a modern replacement module, the GT-8031 is one of the direct candidates.