NMEA-0183 message: ROT

Rate and direction of turn

The heading computation in this message is derived from consecutive positions. For heading using a moving baseline system, see NMEA-0183 message: PTNL,AVR.

An example of the ROT string is:

$GPROT,35.6,A*4E

ROT message fields

Field

Meaning

0

Message ID $GPROT

1

Rate of turn, degrees/minutes, “–” indicates bow turns to port

2

A: Valid data
V: Invalid data

3

The checksum data, always begins with *

From firmware version 5.15 onward, when the Receiver Motion (Dynamic Model) field in the Receiver Configuration - Position screen (see Position) is set to Marine Dynamics, then the Rate of Turn is optimized to more accurately reflect the ship's motion.