11.3 Navigation 

11.3.1 Specification 

11.3.1.1 Fastener specifications 

Torque range 

Fastener name 

Model 

Metric 

(N.m) 

English system 

(lb-ft) 

Q2205516 

4 - 6 

3 - 4.4 

Bolt of navigation head unit 

Q1460620 

5 - 8 

3.7 - 6 

GPS antenna self tapping screw 

ST4 . 2×16 

3 - 4 

2 - 3 

Front door high-pitch speaker self 

tapping screw 

ST4.2×9.5 

3 - 4 

2 - 3 

 

2031

 

11.3.2 Description and operation 

11.3.2.1 Overview 

The on-board navigation system consists of a GPS receiver, a self-disciplined navigation device, a 
vehicle speed sensor, a gyro sensor, an LCD display, etc. GPS is the abbreviation of the term 
"Global Positioning System", which is developed by the United States for military purpose. 

Sending.Its meaning is that the navigation satellite is used for measuring time and distance to form 
the global navigation system. 

The navigation system of this vehicle has an advanced design: the navigation screen, navigation 
ECU and radio are integrated as a whole. Map database adopts a SD card storage technology; the 
previous map database is reserved in the mode of compact disc (CD); compared with the map CD, 
the data is read quickly in the storage mode of SD card; moreover, the map CD player is reduced, 
so that the structure is simple; therefore, the fault probability is also greatly reduced. When new 
navigate map database needs to be updated, the computer only needs to update the data in the SD 
card. If you need to upgradae the map database when you only have a traditional map disc, you 
must replace with a new disc. 

SX718Navigation SD card capacity is 4G. 

The on-board navigation system mainly provides the following functions: 

– 

Best route search of destination; 

– 

Have instant and search function 

– 

Provided rich menus and record function with searcher 

– 

Provide real-time voice prompt during proper time; 

– Extended 

function. 

2032

 

11.3.2.2 GPS system introduction 

A GPS mainly consists of three parts: space equipment, ground control and user terminals. 

Space segment: 

Including 21 satellites and 3 backup satellites, which as a whole seem like a constellation hanging 
20,000km high above the ground.Uniformly distribute in 6 orbital planes at the orbital angle of 
55°, wherein the angle between the orbital planes is 60°, 4 satellites are distributed in each orbit; 
thus, such distribution structure ensure that more than 4 satellites can be seen at any place of the 
global. 

1

6

8

17

20

21

15

5

10

11

9

14

7

2

4

13

16

18

12

19

NL11-2019b

 

Ground control section: 

For navigation positioning, firstly, the position of the satellite must be known. However, the 
position of the satellite is obtained based on the calculation of the movement of the satellite and its 
orbital parameters. Ground monitoring station constantly observes each satellite all the year round. 
According to the satellite state parameter observed, regulate the satellite to the preset orbit timely 
and amend the pose of the satellite. When certain satellite faults, a standby satellite can further be 
dispatched instead of the invalid one. 

User receiving system: 

The user receiving system includes hardware, such as a power supply, an antenna, a receiver, a 
microprocessor, control display device and the like, as well as other built-in software and data 
processing software package etc. 

2033

 

11.3.2.3 Extended function introduction 

1. Radio 

function 

The same as the common radio, the system has a radio function. The radio station can be stored by 
storing the list. After disconnecting the battery negative cable, radio station information in a 
memory list shall be reset completely. 

2. SD 

function 

Notes: 

This system supports the function of using a SD card for its intended purpose: an MP3/WMA file 
can be played only when it is copied onto another SD card not storing map files if it is copied onto 
a SD card containing map files and the system cannot recognize the corresponding audio file. 

This system supports playing audio files of such formats as MP3, WMA. After the SD card 
equipped with the MP3/WMA format file is inserted, the [SD] key system is pressed to start 
playing audio files in the SD card, and the display shows the SD state, including the information, 
such as "track name", "singer information" and "playback progress bar", etc. 

2034