Saab R5 SUPREME AIS, Operation & Installation Manual

Page: 44 / 156

R5
SUPREME - Navigation System
CONFIGURATION
7000 118-301, A3 Page 44
4.2.2 GPS
This view is accessed by pressing Main Menu

Configuration

GPS / DGPS

GPS
Parameter Name Description
Elevation Mask This parameter sets the elevation cutoff mask angle, in
degrees, for the GPS. Any satellites below this mask
angle will be ignored, even if available. The value
should be between 0° and 60°, and the default value is
5°.
Correction Age This parameter sets the maximum allowed age (in
seconds) for correction data. The R4 Navigation
Sensor is able to use old correction data for extended
periods of time. The default setting is 120 seconds. The
lowest allowed value is 10 seconds and the highest 900
seconds. When increasing the allowed correction age,
ensure that the new setting meets your requirements
as accuracy will degrade with increasing correction
age.
Correction Source This parameter sets the source for differential
corrections. Valid settings are:
Beacon. In this setting the system will use signals from
IALA radio beacon stations as source for differential
corrections. This setting is only available when using an
R4 DGPS Navigation Sensor (the DGPS configuration).
SBAS. This setting makes the system use SBAS
satellite signals as source for differential corrections.
User Port 1. This setting will command the system to
apply external differential corrections received in RTCM
SC-104 format on the User 1 port. The User 1 port will
not be available for output of serial data from the
system if this setting is selected.
None. This setting makes the system operate in
autonomous
mode, not using any differential
corrections.
ATTENTION: Both the EGNOS and MSAS satellite
based augmentation systems (SBAS) are currently
under development. Signals from these systems are
therefore used entirely at your own risk.
SOG Smoothing The SOG Smoothing parameter allows you to adjust
the level of responsiveness of the speed over ground
(SOG) measurement, as displayed by the R5
SUPREME CDU and provided in the $GPVTG and
$GPRMC sentences. The default value is zero, and
increasing the value will increase the level of SOG
smoothing.