Specifications

BATS AND PORTABLE BATS OPERATION

3-48

HDG - Heading, Deviation and Variation

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$ --H D G , x . x , x . x , a , x . x , a * C S < C R > < L F >

Field Number:

1) Magnetic sensor heading, degrees

2) Magnetic variation, degrees, E/W

3) E = east, W = west

4) Magnetic variation, degrees, E/W

5) E = east, W = west

6) * = EOS Delimiter & CS = CheckSum

Trackman calculates magnetic heading by adding Easterly deviation to, or subtracting Westerly de-

viation from, the magnetic sensor reading. It calculates true heading by adding Easterly variation

to, or subtracting Westerly variation from, the magnetic heading. If the sentence structure only

contains magnetic heading information then Trackman displays an “M” after the heading data on

the display screen. If the sentence contains variation information it calculates the true heading and

Trackman displays a “T” after the heading data indicating True heading.

PRDID - Pitch, Roll and Heading

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$ PRDID, + x x .xx , +xx.x x,xxx.x x * C S < C R > < L F >

Field Number:

1) Pitch (+ or -)

2) Roll (+ or -)

3) Heading

4) * = EOS Delimiter & CS = CheckSum

This is typically a Pitch and Roll sentence with an optional Heading output. The data string will

include gyro heading information only if it is available. If there is no heading information available,

the heading field will be null.

The TSS MAHRS and others may not use the Checksum field. Uncheck the “Use Checksum” box

as required.