Acura RL (1996-2004 year). Manual — part 666
GPS Antenna
Receiving the electric waves from the satellites, the GPS antenna amplifies and transmits them to the GPS receiver.
GPS Receiver
The GPS receiver is built in the navigation unit. It calculates the vehicle position by receiving the signal from the GPS
antenna. The vehicle position and signal reception condition is transmitted from the GPS receiver to the navigation control
unit to adjust vehicle position. (cont'd)
Global Positioning System (GPS)
The Global Positioning System (GPS) enables the navigation system to determine the current position of the vehicle by
using the electric waves transmitted from the satellites in orbit around the earth. The satellites transmit the satellite identi-
fication signal, orbit information, transmission time signal, and other information. When the GPS receiver receives the
electric waves from three or more satellites simultaneously, it calculates the current position of the vehicle based on the
distance to each satellite and the satellite positions on their respective orbits.
Position detection Image with GPS satellite
NOTE: Four satellites on each of six orbits.
Precision of GPS
The precision of the GPS varies according to the number of satellites from which electric waves are received and the con-
trol condition. The precision is indicated by the GPS mark shown on the upper left of the display.
GPS MARK
No satellite
mark
No. of
SATELLITES
Two or less
CONDITION
Impossible to detect
vehicle position
Three
Four or more
Yellow
satellite
mark
Green
satellite
mark
Not indicated
Vehicle position
detectable in two
dimensions
Vehicle position
detectable in three
dimensions
Faulty
DESCRIPTION
GPS function is normal.
The satellite electric waves received
by the GPS are too few to detect the
vehicle position.
The longitude and latitude of the
vehicle position can be detected.
(Less precise than detection in three
dimensions)
The longitude, latitude and the alti-
tude of the vehicle position can be
detected. (More precise than detec-
tion in two dimensions)
The GPS can't be used due to a
faulty GPS receiver, open in the
wire, or other fault.
Main Menu
Table of Contents
Description
Navigation Function (cont'd)
Navigation Unit
The navigation unit calculates the vehicle position and guides you to the destination. The unit performs map matching
correction, GPS correction, and distance tuning. It also controls the menu functions and the DVD-ROM drive (hard disk
drive '96 - 99 models). With control of all these items, the navigation unit makes the navigation picture signal, then it
transmits the signal to the display unit and audio driving instructions to the audio unit.
Calculation of Vehicle Position
The navigation unit calculates the vehicle position (the driving direction and the current position) by receiving the direc-
tional change signals from the yaw rate sensor and the travel distance signals from the vehicle speed sensor (VSS).
Map Matching Tuning
The map matching tuning is accomplished by indicating the vehicle position on the roads on the map. The map data
transmitted from the DVD-ROM (hard disk '96 - 99 models) is checked against the vehicle position data, and the vehicle
position is indicated on the nearest road. Map matching tuning does not occur when the vehicle travels on a road not
shown on the map or when the vehicle position is far away from a road on the map.
GPS Tuning
The GPS tuning is accomplished by indicating the vehicle position as the GPS's vehicle position. The navigation unit com-
pares its calculated vehicle position data with the GPS vehicle position data. If there is large difference between the two,
the indicated vehicle position is adjusted to the GPS vehicle position.
Distance Tuning
The distance tuning reduces the difference between the travel distance signal from the VSS and the distance data on the
map. The navigation unit compares its calculated vehicle position data with the GPS vehicle position data. The navigation
unit then decreases the tuning value when the vehicle position is ahead of the GPS vehicle position, and it increases the
tuning value when the vehicle position is behind the GPS vehicle position.
Route Guidance
The navigation unit can calculate different routes to a selected destination. You have four options:
• Direct Route — Calculate a route that is the most direct and will take the least time.
• Easy Route — Calculate a route that minimizes the number of turns needed.
• Minimize Freeways — Calculate a route that avoids freeway travel. If that is not possible, keep the amount of freeway
travel to a minimum.
• Minimize Toll Roads — Calculate a route that avoids or minimizes travel on toll roads
Audio Guidance
The navigation unit transmits audio driving instructions before entering an intersection or passing a junction.
The audio instructions come through audio unit and the front speakers.
DVD-ROM ('00 - 01 models). Hard Disk ('96 - 99 models)
The map data (including all scale rates) is stored in the DVD-ROM/Hard Disk. The map data includes:
• Road distances, road widths, speed limits, traffic regulations, passing time at junction, distances to junctions, and the
driving instructions for audio guidance.
• Latitude and longitude for GPS.
Main Menu
Table of Contents
Audio Unit
The audio unit receives the audio driving instructions from the navigation unit and transmits the instructions through the
front speakers even when the audio system is in use.
Display Unit
'96 - 99 models
The display unit uses liquid crystal display (LCD). The LCD is a 6-inch-wide, Thin Film Transistor (TFT), stripe type with
220,000 picture elements. The color film and fluorescent light are laid out on the back of the liquid crystal film. The touch
sensor on the front of the LCD is an infrared type with nine vertical and nine horizontal infrared rays to produce 81 sensing
points. The display unit transmits the signal from each operation key and the touch switches the navigation unit.
'00 - 01 models
The display unit uses liquid crystal display (LCD). The LCD is a seven-inch-wide, Thin Film Transistor (TFT), stripe type
with 280,800 picture elements. The color film and fluorescent light are laid out on the back of the liquid crystal film. The
touch sensor on the front of the LCD is an infrared type with twenty vertical and seven horizontal infrared rays to produce
140 sensing points. The display unit transmits the signal from each operation key and the touch switches the navigation
unit.
Infrared rays
The illustration shows '00 - 01 models.
Main Menu
Table of Contents
Terminal Arrangement
'97 - 99 Models
NAVIGATION UNIT CONNECTOR A
NAVIGATION UNIT CONNECTOR A (20P)
Wire side of female terminals
Main Menu
Table of Contents
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