GPS Information
23-142
Navigation System
• ILL-Illumination Indication
(Navigation unit connector A (17P) terminal No. 10)
a) OFF (0) when parking lights, or headlights are off
b) ON (1) when parking lights, or headlights are on
The navigation unit uses the signal to determine
whether to put the navigation screen into the Day or
Night brightness mode. (Setup screen 1)
• Display-this displays the current position of the
display
a) (Close) when the display is closed
b) (Open) when the display is open
The navigation unit has a micro switch to detect this. If
open is indicated when the display is closed, replace
the navigation unit.
This screen shows the current status of GPS reception.
The circular diagram shows the current location of the
GPS satellites (yellow balls) as they would appear in the
sky. The outer circle represents the horizon (0 degrees
elevation). The middle and inner circles represents 30
and 60 degrees respectively. The very center of the
diagram (90 degrees elevation) is directly overhead.
Nearby obstructions, like tall buildings, will block
satellites in that direction. That is why it is necessary to
be in an open area to effectively troubleshoot GPS
reception issues. The satellites shown on the diagram
correspond to the PRN number in the GPS Details
screen. There are always 24 active GPS satellites in
orbit. Because satellites fail, and have to be removed
from service, spares are always parked in orbit, ready
to be activated. This is why the PRN (satellite ID
number) can be greater than 24.
NOTE:
• When you use this screen for troubleshooting, park
the vehicle outside, away from buildings, tall trees,
and high-tension wires for at least 10 minutes with
the engine running.
• Metallic window tinting on the front or side window
or after-market electronic accessories mounted near
the navigation unit, GPS antenna, or navigation
display can interfere with GPS acquisition.
• The Number of Satellites box shows the number of
acquired satellites (maximum of 12). It should contain
4 or more icons. If not, troubleshoot for GPS icon is
white or not shown (see page 23-122).
• The Current Position shows latitude, longitude, and
elevation (in meters). If there are less than 4 satellites,
the elevation can be grossly inaccurate.
• The Date/Time field shows the current date, and also
a time that includes daylight savings and other
offsets entered by the client in Setup function Adjust
Time Zone/Clock.
08/08/21 14:07:32 61SNR030_230_0145