User's Manual
CONFIGURATION
001-9193-001 Version 2 Page 42 of 52 Sentry 4G
TM
User
Manual
5.8 GPS Status and Settings
The Sentry 4G unit incorporates a highly sensitive 16-channel GPS receiver and an intelligent
algorithm that offers outstanding receive sensitivity. Summarized below are the specifications of the
integrated GPS module:
Typical sensitivity
-135 dBm
Reacquisition time
Less than 2 seconds
Average Cold/Warm/Hot Start time to first fix
Under 45/15/3.5 seconds
Position Accuracy
GPS Standard Positioning Service (SPS)
<15 meters
DGPS (WAAS) corrected
<3 meters
The GPS page allows the user to see the GPS status and configure remote or local delivery of GPS
position reports. Viewing the GPS data from a local or remote PC requires a UDP port listener
program be installed on the PC. Any UDP listener will work provided you can set an appropriate port
value for the program.
5.8.1 GPS Status
Figure 25 - GPS Status
Condition: Indicates No Fix, Standard GPS Fix, Differential GPS Fix, or Estimated / Last
Known Position
Number of Satellites: Indicates the number of satellites the GPS has locked on to. A
minimum of 3 is required to establish a position. Generally, the more satellites the GPS has
locked, the more accurate the position reporting will be.
UTC: Time of day in Universal Coordinated Time
Position: Device position reported in degrees and minutes
Altitude: Altitude from Mean Sea Level reported in meters.
True Course: Heading, reported in degrees (0 – 360)
Ground Speed: Reported in km/hr