Acura 3.5 RL Manual page 1332

Navigation System
System Diagnosis Mode (cont'd)
GPS Information
This screen shows the current status of GPS reception.
The circular diagram shows the current location of the
GPS satellites (yellow numbers) 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 dia-
gram (90 degrees elevation) is directly overhead.
Naturally, nearby obstructions, like tall buildings will
block satellites in that direction. That is why it is neces-
sary to be in an open area to effectively troubleshoot
GPS reception issues.
The satellite numbers shown on the diagram corre-
spond 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: To use this screen for troubleshooting, the vehi-
cle should be out side away from buildings, tall trees,
and high-tension wires for at least 10 minutes with the
engine running. Also, make sure the rear shelf is free of
loose items that can block reception and that the trunk
lid is closed.
• The "Number of Satellites" box shows the number of
acquired satellites (maximum of 12). It should contain
3 or more icons. If not troubleshoot for "GPS icon is
white" (see page 23-32).
• The "Current Position" shows latitude, longitude, and
elevation (in meters). If there are less than 3 satel-
lites, the elevation can be grossly inaccurate.
• The Date/Time field shows the current date, and also
a time that includes daylight savings and other off-
sets entered by the customer in Setup screen 2
"Adjust Time Zone/Clock".
GPS Detail
By pressing and holding the MENU button for 10 sec-
onds, a GPS Detail screen is displayed. This screen dis-
plays real time incoming satellite positional data. Most
of the information shown on this screen is for factory
use, however some of the data can indicate partial GPS
signal interference.
• The box TS/AS and HDop/VDop is for factory use.
• The Speed and Direction information is updated in
real time when driving, and can be used to detect
intermittent speed sensor problems.
• The Date/Time Information is the same as in Setup
screen 2 "Adjust Time Zone/Clock".
• If the "3D" icon is shown above the yellow dots, this
implies that at least 4 satellites are available for map
positioning, and the "GPS" indicator on the map
screen will be green. See the "Global Positioning
System" detailed explanation in the "System
Description".
• If the row of data in the table below begins with a
"yellow dot", the AZI and EL fields can be used to
locate each satellite on the circular GPS diagram (see
prior screen).
NOTE: The data below is an example only.
The table of values shown on the screen below has the
following columns:
If "3D" is missing, fol-
low troubleshooting
(see page 23-32).
If all 0, then, follow
troubleshooting (see
page 23-32).