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0xa2 Telematics: Coordinates

Nav. 0x7f → Telephone 0xc8

The relevance of coordinates to telephone is in the role of telematics.

Later navigation computers should send coordinates irrespective of what telephone equipment is installed.

Related

  • 0x1f GPS Time
  • 0xa4 Telematics: Location

Examples

7F 14 C8 A2 00 00 36 01 36 50 01 15 09 02 61 00 00 00 00 00 00 2E
7F 14 C8 A2 00 00 38 48 16 60 00 77 10 03 61 00 00 00 15 38 00 2F
7F 14 C8 A2 01 00 49 48 03 50 00 08 44 19 80 02 30 00 16 10 51 E2
7F 14 C8 A2 01 00 51 28 35 20 00 00 56 58 11 00 46 00 17 00 32 10
7F 14 C8 A2 01 00 37 51 21 41 01 45 02 29 70 00 46 00 00 02 12 4F

Parameters

Fixed length. 17 data bytes.

Parameter Index Length
Signal 0 1
Latitude 1 5
Longitude 6 5
Altitude 11 2
NA 13 1
Time 14 3

Signal

If signal has not been acquired, or is temporarily lost, the coordinates and/or time may be inaccurate, or default to 00 00....

Parameter Index Length Type
Signal 0 1 Bitfield 
# Signal
# Index: 0, Length: 1
SIGNAL_FALSE    = 0x00
SIGNAL_TRUE     = 0x01

Latitude

Parameter Index Length (byte) Length (bit) Type
Degrees 1 2 16 Packed BCD
Minutes 3 1 8 Packed BCD
Seconds 4 1 8 Packed BCD
Fractional Sec. 5 1 4 MSB BCD
Sign (N/S) 5 1 4 LSB Bitfield 
# Sign (North/South)
# Index: 5, Length: 1 (4 LSBs)
SIGN_POS_NORTH  = 0b0000
SIGN_NEG_SOUTH  = 0b0001

Longitude

Parameter Index Length (byte) Length (bit) Type
Degrees 6 2 16 Packed BCD
Minutes 8 1 8 Packed BCD
Seconds 9 1 8 Packed BCD
Fractional Sec. 10 1 4 MSB BCD
Sign (E/W) 10 1 4 LSB Bitfield 
# Sign (East/West)
# Index: 10, Length 1 (4 LSBs)
SIGN_POS_EAST = 0b0000
SIGN_NEG_WEST = 0b0001

Altitude

Parameter Index Length Note
Altitude (metre) 11 2 Packed BCD

NA

Parameter Index Length Note
NA 13 1 Default 00

Time

Similar to 0x1f GPS Time.

  • Time is expressed as a 24-hour clock
  • Time is in UTC
  • Unlike GPS-T, is not sent at the top of the minute, thus seconds will not be limited to :00
  • Sent at 30 second intervals, e.g. :15 and :45, or :51 and :21.
Property Index Length Type
Hour 14 1 Packed BCD
Minute 15 1 Packed BCD
Second 16 1 Packed BCD

Example

# Telematics: Coordinates frame
7F 14 C8 A2 01 00 37 51 21 41 01 45 02 29 70 00 46 00 00 02 12 4F
Parameter Data Parsed
Signal 01 TRUE
Lat: Degrees 00 37 37°
Lat: Minutes 51 51′
Lat: Seconds 21 21
Lat: Fractional Sec. 41 & 0b1111_0000 => 40 .4″
Lat: Sign (N/S) 41 & 0b0000_1111 => 01 S
Long: Degrees 01 45 145°
Long: Minutes 02 02′
Long: Seconds 29 20
Long: Fractional Sec. 70 & 0b1111_0000 => 70 .7″
Long: Sign (E/W) 70 & 0b0000_1111 => 00 E
Altitude 00 46 46m
NA 00 --
Time: Hour 00 00
Time: Minute 02 :02
Time: Seconds 12 :12 
# Telematics: Coordinates parsed
37°51′21.4″S 145°02′29.7″E 46m
00:02:12+00:00

Use Cases

Emergency Call

Emergency Coordinates Source: BimmerNav

Earlier telephone modules will display location and coordinates when making a manual emergency call.

BMW Assist: Emergency Call

In addition, the TCU accompanies [manual and automatic] emergency calls with an SMS text message providing the location coordinates of the vehicle to the service provider.

The following data are transmitted in the SMS:

  • Location of vehicle
  • Vehicle identification number
  • Telephone number (from mobile phone)
  • Licence number, colour, model (if specified)

BMW Assist: Roadside Assistance

A breakdown call is sent by selecting the menu point BMW roadside assistance service, i.e. data are sent to the BMW roadside assistance service together with the current location and vehicle profile.