Time Transfer (Message 5101): Also sent at 1 Hz, this message is essential for high-accuracy time synchronization between the GPS and the connected system. icd-gps-153 protocol

While the full specification is restricted to authorized personnel, standard implementations include these key periodic updates: Message Type Current Status Real-time health and status of the GPS receiver. Time Transfer Precise time of day (UTC) and Leap Second information. Buffer Box Once every 6s Introduction

) can be swapped or integrated into various platforms like missiles, aircraft, or handheld devices. Mayflower Communications message formats or how it differs from commercial protocols like NavGuard® 100 SAASM GPS Receiver with Anti-Jam Payloads per MessageType: Time Transfer (Message 5101): Also

Key Technical Aspects of the ICD-GPS-200 Protocol:

• HealthFlags: uint16 (bitfield)
• ReceiverMode: uint8
• VendorStatus: varbytes (optional)

• Message Type 1 – Position/Time: Contains latitude, longitude, altitude, time of week (TOW), and position fix type (3D, differential, etc.).
• Message Type 2 – Velocity: East, North, Up (ENU) velocities, speed over ground, heading.
• Message Type 4 – Satellite Tracking Status: PRN numbers, C/No, azimuth, elevation for all tracked satellites.
• Message Type 7 – Almanac/Ephemeris: Coarse orbital data for all GPS satellites.
• Message Type 15 – SAASM Status & Key Management: Cryptographically protected data for anti-spoofing.
• Message Type 26 – Precision Position: High-accuracy solution with standard deviation estimates.

Message Types