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B     GSOF Messages

140     SPSx51 Modular GPS Receivers User Guide

This message describes position time information. It contains the following data:

GPS time, in milliseconds of GPS week

GPS week number

Number of satellites used

Initialization counter

This message describes latitude, longitude, and height. It contains the following data:

WGS-84 latitude and longitude, in radians

WGS-84 height, in meters 

Table B.3

Time (Type 1 record)

0

Output record type

Char

01h

Position time output record

1

Record length

Char

0Ah

Bytes in record

2–5

GPS time (ms)

Long

msecs

GPS time, in milliseconds of GPS week

6–7

GPS week number

Short

number

GPS week count since January 1980

8

Number of SVs used

Char

00h-0Ch

Number of satellites used to determine the 
position (0-12)

9

Position flags 1

Char

See 

Reports first set of position attribute flag 
values

10

Position flags 2

Char

See 

Reports second set of position attribute flag 
values

11

Initialized number

Char

00h-FFh

Increments with each initialization (modulo 
256)

Table B.4

Latitude, longitude, height (Type 2 record)

0

Output record type

Char

02h

Latitude, longitude, and height output record

1

Record length

Char

18h

Bytes in record

2–9

Latitude

Double Radians

Latitude from WGS-84 datum

10–17

Longitude

Double Radians

Longitude from WGS-84 datum

18–25

Height

Double Meters

Height from WGS-84 datum