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GPS Settings
• Differential Correction
Differential Correction allows WAAS correction information to be used to improve accuracy of the GPS position
reports.
Note: WAAS correction applies to North America only. The WAAS satellites currently in service are 48 (Galaxy 15)
and 51 (Anik F1R). The previous WAAS satellites 35 and 47 were taken out of service on 2007/07/30.
• Report Rate
For applications that require it, GPS reports are normally received from the internal GPS receiver at a rate of once
per second. Local Delivery reports are sent at this rate. Remote Delivery reports are limited by the "But no less than
X seconds between reports" setting.
Autonomous Automatic Vehicle Location (AAVL) Settings
The Autonomous Automatic Vehicle Location (AAVL) feature adds the ability for GPS-equipped Vanguard Cellular
Broadband Routers to transmit position reports either to a host connected to the local Ethernet port or to a remote
host over the cellular network. AAVL allows the system designer to specify the maximum distance or the time interval
between remote position reports.
Position reports can be transmitted in a number of possible formats. When the format is disabled or the Address or
Port fields are blank, no report is sent.
Table 22 Position report format information
Format
Definition
TAIP, No ID
Trimble ASCII
Interface Protocol
(TAIP), No ID
TAIP, With ID
Trimble ASCII
Interface Protocol
(TAIP), With ID
NMEA, GGA
NMEA GGA (Global
Positioning System Fix
Data)
NMEA, GLL
NMEA GLL
(Geographic Latitude
& Longitude)
NMEA, RMC
NMEA RMC
(Recommended
Minimum data)
NMEA, VTG
NMEA VTG (Vector
Track and speed over
Ground)
Example
>RPV73511+4549542-0736643100035822;*7F<
>RPV56655+4549542-0736643300000002;ID=ADAM12;*5E<
$GPGGA,202742.0,4529.7240,N,7339.8585,W,2,9,0.9,28,M,,,,*3E
$GPGLL,4529.7241,N,7339.8584,W,202645.0,A,D*7C
$GPRMC,153716.00,A,4529.72428,N,07339.86082,W,0.007,,180108,,,A*69
$GPVTG,,T,,M,0.004,N,0.008,K,A*2F
Vanguard 3000 Series Multicarrier Cellular Data Modem & IP Router PN 001-7300-100 Rev. B
| Page 70
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