Installation guide

LMU Users Guide

V1.0.6 December 10 2009

- 65 - CalAmp Proprietary & Confidential

AT$APP PARAM 1024,19,128,0

9.5

While connected to the LMU’s host port, it is possible to enable further GPS messaging

beyond or instead of NMEA. Two of these messages are intended for use with MDTs while

the other is used for GPS debug.

Local GPS Messaging

9.5.1 Odometer Message

The ODO message is meant for use with MDTs to provide a compact description of the

current position of the LMU including an odometer estimate.

The message has the following format:

ODO,<time of

fix>,<latitude>,<longitude>,<heading>,<speed-

mph>,<speed-cm/s>,<HDOP>,<number of sats>,<Max

Speed>,<odo-skip>,<odometer>

This is the time of fix as produced by the GPS Receiver. It is displayed in seconds

since 00:00:00 of Jan 1, 1970.

This is the latitude produced by the GPS Receiver in decimal degrees. The value is

scaled by 10

. Please note that this value is subject to pinning

This is the longitude produced by the GPS Receiver in decimal degrees. The value is

scaled by 10

. Please note that this value is subject to pinning

This the heading value produced by the GPS Receiver in degrees from true north.

<speed-mph>

This the speed reading produced by the GPS Receiver in miles per hour.

<speed-cm/s>

This the speed reading produced by the GPS Receiver in centimeters per second.

<HDOP>

This is the Horizontal Dilution of Precision value produced by the GPS Receiver

scaled by 100.

This is the number of satellite the GPS Receiver is using to compute its position.