AIS Message Encoder

Build a valid AIS Type 1 position report from form inputs with step-by-step encoding.

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MMSI

Navigation status

Speed (SOG, knots)

Course (COG, °)

Latitude (°)

Longitude (°)

True heading (°)

NMEA sentence

!AIVDM,1,1,,A,15M67F@P1sG@9s0K;P83Ojmp0000,0*14

Encoding steps

1. Pack fields into 168 bits

000001000101011101000110000111010110010000100000000001111011010111010000001001111011000000011011001011100000001000000011011111110010110101111000000000000000000000000000

2. ASCII-armor in 6-bit groups
payload = 15M67F@P1sG@9s0K;P83Ojmp0000 (fill bits = 0)
3. Build sentence body
AIVDM,1,1,,A,15M67F@P1sG@9s0K;P83Ojmp0000,0
4. XOR checksum
*14

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