OSM Map On Garmin/LBL Subfile Format

OSM Map On Garmin

• Pre-Made Map Download
• Map File Format
  • IMG File Format
    • TRE Subfile Format
    • LBL Subfile Format
    • RGN Subfile Format
    • NET Subfile Format
    • NOD Subfile Format
    • MDR Subfile Format
    • SRT Subfile Format
    • GMP Subfile Format
    • DEM Subfile Format
    • TRK Subfile Format
  • TDB File Format
  • TYP File Format
• POI Files
• POI Types
• Mass Storage Mode
• mkgmap
• cGPSmapper
• Mapwel
• QLandkarte
• Cycle map

A reverse-engineering of Garmin's LBL Subfile format

LBL Header

	Byte Offset	Length (bytes)	Description	Notes
Header	0x000	2	LBL Header length.
	0x002	19	Garmin Common Header	The ID-String will be "GARMIN LBL"
LBL1	0x015	4	Offset
	0x019	4	Length
	0x01d	2	Data label offset multiplier
	0x01e	1	Label coding type	0x06, 0x09 and 0x0a have been seen
LBL2 Countries	0x01f	4	Offset
	0x023	4	Length
	0x027	2	Record size
	0x029	4	Flags
LBL3 Regions	0x02d	4	Offset
	0x031	4	Length
	0x035	2	Record size
	0x037	4	Flags
LBL4 Cities	0x03b	4	Offset
	0x03f	4	Length
	0x043	2	Record size
	0x045	4	Flags
LBL5 POI index	0x049	4	Offset
	0x04d	4	Length
	0x051	2	Record size
	0x053	4	Flags
LBL6 POI properties	0x057	4	Offset
	0x05b	4	Length
	0x05f	1	Offset multiplier
	0x060	1	Global mask
	0x061	3	Unknown
LBL7 POI types	0x064	4	Offset
	0x068	4	Length
	0x06c	2	Record size
	0x06e	4	Flags
LBL8 ZIPs	0x072	4	Offset
	0x076	4	Length
	0x07a	2	Record size
	0x07c	4	Flags
LBL9 Highways	0x080	4	Offset
	0x084	4	Length
	0x088	2	Record size
	0x08a	4	Flags
LBL10 Exits	0x08e	4	Offset
	0x092	4	Length
	0x096	2	Record size
	0x098	4	Flags
LBL11 Highway data	0x09c	4	Offset
	0x0a0	4	Length
	0x0a4	2	Record size
	0x0a6	4	Flags
	0x0aa	2	Codepage	0xe4 0x04 = 1252 has been spotted
	0x0ac	4	Unknown (flags?)

tbc...

Resources

• Garmin IMG Format at Sourceforge (pp. 40-41).