Nissan Sentra. Manual - part 58

AV-224

< SYSTEM DESCRIPTION >

[NAVIGATION WITHOUT BOSE]

SYSTEM

SYSTEM

System Diagram

INFOID:0000000009758935

System Description

INFOID:0000000009758936

Refer to Owner’s Manual for navigation and audio system operating instructions.

Audio function and display are built into AV control unit.

This navigation has the following functions.

• Map data on SD-card.
• Full support for playback of music from iPod

®

 and USB device

• High resolution color 5.8 inch display with touch panel function

• FM/AM twin digital tuner

• USB mass storage connection

• Satellite radio

• Hands-free phone system
iPod

®

 is a trademark of Apple inc., registered in the U.S. and other countries.

NAVIGATION SYSTEM FUNCTION

Description

• The navigation system can be operated by control panel of the AV control unit and display (touch panel) of

the AV control unit.

• Guide sound during the operation of the navigation system is output from AV control unit to front speakers.

• AV control unit calculates the vehicle location based on the signals from GYRO (angle speed sensor), vehi-

cle sensor, and GPS satellite, as well as the map data from map SD-card. The vehicle location is displayed

on the AV control unit.

POSITION DETECTION PRINCIPLE

The navigation system periodically calculates the vehicle's current position according to the following three

signals:

• Travel distance of the vehicle as determined by the vehicle speed sensor

• Turning angle of the vehicle as determined by the gyroscope (angular velocity sensor)

• Direction of vehicle travel as determined by the GPS antenna (GPS information)

The current position of the vehicle is then identified by comparing the calculated vehicle position with map data

read from the map SD-card (map-matching), and indicated on the screen as a vehicle mark. More accurate

data is judged and used by comparing vehicle position detection results found by the GPS with the result by

map-matching.

AWNIA3361GB

AV

SYSTEM

AV-225

< SYSTEM DESCRIPTION >

[NAVIGATION WITHOUT BOSE]

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The current vehicle position will be calculated by detecting the dis-

tance the vehicle moved from the previous calculation point and its

direction.

• Travel distance

Travel distance calculations are based on the vehicle speed sen-

sor input signal. Therefore, the calculation may become incorrect

as the tires wear down. To prevent this, an automatic distance cor-

rection function has been adopted.

• Travel direction

Change in the travel direction of the vehicle is calculated by a gyro-

scope (angular velocity sensor) and a GPS antenna (GPS informa-

tion). They have both advantages and disadvantages.

More accurate traveling direction is detected because priorities are set for the signals from these two

devices according to the situation.

MAP-MATCHING

Map-matching compares a current location detected by the method

in the “Location Detection Principle” with a road map data from map

SD-card.

NOTE:

The road map data is based on data stored in the map SD-card.

The vehicle position may not be corrected under the following circumstances and after driving for a certain

time when GPS information is difficult to receive. In this case, the vehicle mark on the display must be cor-

rected manually.

• In map-matching, alternative routes to reach the destination will be

shown and prioritized, after the road on which the vehicle is cur-

rently driven has been judged and the vehicle mark has been repo-

sitioned.

Alternative routes will be shown in different order of priority, and

the incorrect road can be avoided if there is an error in distance

and/or direction.

Routes are of the same priority if two roads are running in parallel.

Therefore, the vehicle mark may appear on either of them alter-

nately, depending on maneuvering of the steering wheel and con-

figuration of the road.

SEL684V

Type

Advantage

Disadvantage

Gyroscope
(angular velocity sensor)

Can detect the vehicle's turning angle quite 
accurately.

Direction errors may accumulate when vehicle is 
driven for long distances without stopping.

GPS antenna
(GPS information)

Can detect the vehicle's travel direction 
(North/South/East/West).

Correct direction cannot be detected when vehicle 
speed is low.

SEL685V

SEL686V

AV-226

< SYSTEM DESCRIPTION >

[NAVIGATION WITHOUT BOSE]

SYSTEM

• Map-matching does not function correctly when a road on which

the vehicle is driving is new and not recorded in the map SD-card,

or when road pattern stored in the map data and the actual road

pattern are different due to repair.

The map-matching function may find another road and position the

vehicle mark on it when driving on a road not present in the map.

Then, the vehicle mark may change to it when the correct road is

detected.

• Effective range for comparing the vehicle position and travel direc-

tion calculated by the distance and direction with the road data

read from the map SD-card is limited. Therefore, correction by

map-matching is not possible when there is an excessive gap

between current vehicle position and the position on the map.

GPS (Global Positioning System)

GPS (Global Positioning System) is developed for and is controlled

by the US Department of Defense. The system utilizes GPS satel-

lites (NAVSTAR), transmitting out radio waves while flying on an orbit

around the earth at an altitude of approximately 21,000 km (13,049

mile).

The receiver calculates the travel position in three dimensions (lati-

tude/longitude/altitude) according to the time lag of the radio waves

that four or more GPS satellites transmit (three-dimensional position-

ing). The GPS receiver calculates the travel position in two dimen-

sions (latitude/longitude) with the previous altitude data if the GPS

receiver receives only three radio waves (two-dimensional position-

ing). GPS position correction is not performed while stopping the

vehicle.

Accuracy of the GPS will deteriorate under the following conditions:

• In two-dimensional positioning, GPS accuracy will deteriorate when altitude of the vehicle position changes.

• The position of GPS satellite affects GPS detection precision. The position detection may not be precisely

performed.

• The position detection is not performed if GPS receiver does not receive radio waves from GPS satellites.

(Inside a tunnel, parking in a building, under an elevated highway etc.) GPS receiver may not receive radio

waves from GPS satellites if any object is placed on the GPS antenna.

NOTE:

• The detection result has an error of approximately 10 m (32.81 ft) even with a high-precision three dimen-

sional positioning.

• There may be cases when the accuracy is lowered and radio waves are stopped intentionally because the

GPS satellite signal is controlled by the US trace control center.

SATELLITE RADIO FUNCTION

• Satellite radio function is built into AV control unit.

• Sound signal (satellite radio) is received by satellite antenna and transmitted to AV control unit. AV control

unit outputs sound signal to each speaker.

AUXILIARY INPUT FUNCTION

• Sound can be output from an external device by connecting a device with USB connector and AUX jack.

• AUX sound signals are transmitted to each speaker via AV control unit.

REAR VIEW MONITOR FUNCTION

Camera Image Operation Principle

• The AV control unit supplies power to the rear view camera when receiving a reverse signal.

• The rear view camera transmits camera images to the AV control unit when power is supplied from the AV

control unit.

• The AV control unit combines a warning message and fixed guide lines with an image received from the rear

view camera to display a rear view camera image on the screen.

USB CONNECTION FUNCTION

• iPod

®

 or music files in USB memory can be played. 

SKIA0613E

SEL526V

AV

SYSTEM

AV-227

< SYSTEM DESCRIPTION >

[NAVIGATION WITHOUT BOSE]

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• Sound signals are transmitted from USB connector and AUX jack to the AV control unit and output to each

speaker and tweeter.

• iPod

®

 is recharged when connected to USB connector and AUX jack.

NOTE:
Use the enclosed USB harness when connecting iPod

®

 to USB connector and AUX jack.

iPod

®

 is a trademark of Apple inc., registered in the U.S. and other countries.

SPEED SENSITIVE VOLUME SYSTEM

• Volume level of this system goes up and down automatically in proportion to the vehicle speed.

• The control level can be selected by the customer.

HANDS-FREE PHONE SYSTEM

• Bluetooth

®

 control is built into AV control unit.

• The connection between cellular phone and AV control unit is performed with Bluetooth

®

 communication.

• The voice guidance signal is input from the AV control unit and output to the front speakers when operating

the cellular phone.

When A Call Is Originated

• Spoken voice sound output from the microphone (microphone signal) is input to AV control unit. 
• AV control unit outputs to cellular phone with Bluetooth

®

 communication as a TEL voice signal. 

• Voice sound is then heard at the other party.

When Receiving A Call

• Voice sound is input to own cellular phone from the other party. 
• TEL voice signal is input to AV control unit by establishing Bluetooth

®

 communication from cellular phone,

and the signal is output to front speakers.