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146     SPSx51 Modular GPS Receivers User Guide

This message provides information relating to the receiver battery and memory. It 
contains the following data:

Remaining battery power

Remaining memory

This message provides attitude information relating to the vector between the Heading 
antenna and the Moving Base antenna. It contains the following data:

Tilt or vertical angle, in radians, from the Heading antenna to the Moving Base 
antenna relative to a horizontal plane through the Heading antenna

Heading or yaw, in radians, relative to True North

Range or slope distance between the Heading antenna and the Moving Base 
antenna

Table B.14

Batt/Mem (Type 37 record)

0

Output record type Char

25h

1

Record length

Char

0Ah

Bytes in record

2–3

Battery capacity

Unsigned short percentage

Remaining battery capacity in percentage

4–11

Remaining memory Double

hours

Estimated remaining data logging time in 
hours

Table B.15

Attitude (Type 27 record)

0

Output record type

Char

1Bh

Attitude information

1

Record length

Char

2Ah

Bytes in record

2–5

GPS time

Long

msecs

GPS time in milliseconds of GPS week

6

Flags

Char

See 

Flag bits indicating validity of attitude components

7

Number of SVs used

Char

00h-0Ch

Number of satellites used to calculate attitude

8

Calculation mode

Char

See 

Positioning mode

9

Reserved

Reserved

10–17

Tilt

Double radians

Tilt relative to horizontal plane

18–25

Yaw

Double radians

Rotation about the vertical axis relative to True 
North

26–33

Reserved

Reserved

34–41

Range

Double meters

Distance between antennas

42–43

PDOP

Short

0.1

Position Dilution of Precision