Land Rover Discovery Owners & Service Manuals

Land Rover Discovery: Navigation System / Operation

The navigation system receives GPS information via the GPS antenna. The GPS signals are used by the navigation system to calculate the vehicle's position. Once the driver has input a desired destination, the navigation system can calculate a route, based on the driver's pre-determined preferences or the default settings in the navigation system.

The navigation system is accessed from the Touch Screen (TS) home menu.

Navigation is initiated by the driver inputting a destination. This can be achieved via the TS by:

  • Entering an address
  • Entering a post code
  • Choosing a previous destination
  • Choosing a point of interest from the map disc database
  • Choosing the home location
  • Choosing a memory stored location.

The driver is then guided to the destination by a scrolling map display and voice guidance. The display can be varied by scale and display type.

Selection of 'Navigation' on the TS home menu and subsequent sub-menu selection sends a control request signal to the IAM for Rest Of World (ROW) markets on the Media Oriented Systems Transport (MOST) ring. In China, India, Asia markets the TS control request is passed to the NCM via the medium speed CAN comfort systems bus. The requested control information is processed by the Integrated Audio Module (IAM) or NCM.

On ROW vehicles, if voice guidance is operational, the voice signals are passed from the IAM to the Audio Amplifier Module (AAM) on the MOST ring for output on the speaker system.

On Japan vehicles, if voice guidance is operational, the voice signal information is relayed from the NCM on the MOST to the AAM for output on the speaker system.

On China, India, Asia vehicles, if voice guidance is operational, the voice signal information is relayed from the NCM, via an analogue audio signal to the IAM. The IAM converts the analogue signals which are then passed to the AAM on the MOST ring for output on the speaker system.

The navigation audio output is through the front speakers whilst the background audio, for example radio or CD (compact disc), is played at a reduced volume on the rear speakers. On China, India, Asia systems the radio or CD output is paused while navigation audio output is operating.

The GPS signal is available to the navigation system at all times when the vehicle ignition is switched on.

Navigation user voice commands are made using the Land Rover Advanced Voice system. The TS processes the analogue signal from the Voice switch on the left steering wheel switchpack. This is passed from the TS onto the MOST system to the Land Rover Advanced Voice control software which is integral with the IAM (ROW) or NCM (Japan, China, India). Voice control of the navigation system is not available on Asia specification vehicles.

The TS sends an instruction via the MOST ring to the IAM to turn on the microphone facility. The microphone is hardwired to the IAM.

For the ROW system, spoken voice commands are processed by the IAM.

The processed commands are then sent to the TS to determine which control signals need to be sent to the navigation system.

For the Japan system, the analogue voice signals are relayed from the IAM via the MOST ring directly to the NCM for processing. Navigation commands are handled internally within the NCM without the need for communicating with the TS for control.

For China and India systems, the analogue voice signals are relayed from the IAM via the medium speed CAN comfort systems bus directly to the NCM. Navigation commands are handled internally by the NCM.

Traffic data from the Traffic Message Channel (TMC) or the VICS (Japan only) is processed by the IAM or NCM (Japan only), distributed to the TS with any supporting voice instruction relayed through the MOST ring to either the IAM or audio amplifier module, dependant on equipment level, for output on the speaker system.

TRAFFIC MESSAGE CHANNEL (TMC)

NOTE:

TMC is not available in all markets.

The TMC is a specific application of the FM Radio Data System (RDS) or Radio Broadcast Data System (RBDS) (NAS only) used for broadcasting realtime traffic and weather information. Data messages are received and decoded by the IAM or the AHU. The IAM or the AHU processes the received information and alerts the driver and offers alternative route guidance to avoid the incident.

Each traffic incident is sent as a TMC message. One message consists of an event code and a location code in addition to time details. The message is coded and can be translated by the IAM or AHU into the market language.

Location code tables assign numbers to locations on the road network. The location tables are integrated in the maps stored on the IAM hard disk drive or on the SD memory card on vehicles with an AHU. The source of traffic information is typically police, traffic cameras and local network stations.

The TMC system uses the existing FM antenna located in the rear window and the audio system antenna amplifiers to pass the signals to the IAM or AHU.

VEHICLE INFORMATION AND COMMUNICATION SYSTEM (VICS) - JAPAN ONLY

The VICS is a similar system to the TMC used outside of Japan. VICS is a unique system for Japan and provides countrywide coverage and broadcasts of real-time traffic and weather information. The VICS has three methods of transmitting the traffic data to the vehicle's navigation system: FM, microwave RF and infrared. The microwave and infrared transmissions are both received by the VICS beacon antenna. The same information is also transmitted on a FM wavelength and is received by the FM antenna located in the rear window and uses the audio system antenna amplifiers to pass the signals to the Navigation Computer Module (NCM).

The VICS supplies information to enable the NCM to re-route the navigation guidance or to inform the vehicle driver of traffic conditions in the vehicles vicinity.

The RF transmissions are generally transmitted from road side beacons mainly on expressways. The information transmitted is as follows:

  • Traffic congestion
  • Travel time to next intersection
  • Traffic conditions in surrounding areas and expressway turn offs
  • Traffic accidents
  • Speed limits
  • Lane regulations
  • Tire change
  • Parking availability at expressway service areas and parking areas.

Infrared transmissions are transmitted from road side beacons on major trunk roads. The information transmitted is:

  • Traffic congestion and travel time
  • Traffic accidents
  • Breakdowns
  • Road works restrictions
  • Parking availability.

FM transmissions are broadcast as part of the FM multiplex broadcasting system from NHK (Japanese Broadcasting Corporation) FM stations.

Information transmitted is:

  • Traffic congestion and travel time for wide areas
  • Traffic accidents, road works, speed limits and lane restrictions for a wide area
  • Parking availability information.

The traffic data is split from the normal FM transmissions by the FM antenna amplifier module.

OFF-ROAD NAVIGATION

NOTE:

Off-Road Navigation is not available on Asia/Japan navigation systems.

Off-road navigation is selected pressing the 'NAV' switch on the TS then select the 'Off-road Nav' icon.

Off-road navigation maps are similar to the on-road maps but have additional features and information, for example; a large compass display, heading, altitude, latitude and longitude.

When switching to off-road navigation mode during on-road guidance, the current highlighted on-road route will be removed from the map and onroad guidance will be suspended. Way points and destination icons will remain displayed. The destination is marked with a double circle.

When exiting off-road guidance, the system recalculates the route and reverts to on-road guidance.

NOTE:

TMC is not available during off road navigation.

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