Acura TSX / Honda Accord CL. Manual - part 162

Fig. 26: GPS Receiver Receiving A Signal From Three Or More Satellites Simultaneously 

PRECISION OF GPS 

The precision of the GPS varies according to the number of satellites from which electric waves are received 
and the control condition. The precision is indicated by the color of the GPS icon shown on the upper right of 
the display. 

Fig. 27: Identifying GPS Icon Display 

GPS ANTENNA 

The GPS antenna amplifies and transmits the signals received from the satellites to the GPS receiver.

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Navigation System - TSX

  

 

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. 

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, and interprets voice commands. 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 directional change signals from the yaw rate sensor and the travel distance signals from the PCMs vehicle 
speed pulse (VSP) signal. 

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 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 compares 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 VSP 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 always ahead of 
the GPS vehicle position, and it increases the tuning value when the vehicle position is always behind the GPS 
vehicle position. 

ROUTE GUIDANCE 

The navigation unit can calculate different routes to a selected destination. You have five options:  

z

Direct Route - Calculate a route that is the most direct.  

z

Easy Route - Calculate a route that minimizes the number of turns needed. 

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Navigation System - TSX

  

 

z

Minimize Freeways - Calculate a route that avoids freeway travel. If that is not possible, keep the amount 
of freeway travel to a minimum.  

z

Minimize Toll Roads - Calculate a route that avoids, or minimizes travel on toll roads.  

z

Maximize Freeways - Calculate a route that uses freeways as much as possible.  

AUDIO GUIDANCE 

The navigation unit transmits audio driving instructions before entering an intersection or passing a junction. 
The audio instructions come through the audio unit to the front speakers. 

DVD-ROM 

The map data (including all scale rates) is stored in the DVD-ROM. The map data includes:  

z

Road distances, road widths, speed limits, traffic regulations, passing time at junction, distances to 
junctions, and the driving instructions for audio guidance.  

z

Latitude and longitude GPS.  

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 

The display unit uses a liquid crystal display (LCD). The LCD is a 8-inch-diagonal, thin film transistor (TFT), 
stripe type with 336,960 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 consists of a touch sensitive resistive membrane 
with an infinite number of possible touch locations. To maintain compatibility with earlier display units the 
sensing locations are confined to a grid of 20 vertical and 9 horizontal touch locations. This produces 180 total 
sensing points. The display unit transmits the signal from each operation key and the touch switches to the 
navigation unit over the GA-Net bus. 

MICROPHONE 

The microphone receives voice commands and transmits them to the navigation unit for interpretation. 

TALK BUTTON (VOICE CONTROL SWITCH) 

Activates the voice control system in the navigation unit to accept voice commands. 

BACK BUTTON (VOICE CONTROL SWITCH) 

NOTE:

The front speakers are muted whenever the navigation system is giving 
guidance commands, and all of the speakers when the voice control system is 
being used.

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Navigation System - TSX

  

 

Returns the display to the previous screen. 

GLOSSARY 

The following is a glossary of terms pertaining to the Voice Recognition Navigation System. 

Fig. 28: Voice Recognition Navigation System Glossary (1 Of 3)

 

2004 Acura TSX 

2004 ACCESSORIES & EQUIPMENT Navigation System - TSX