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JCV File format

A junction view is a SVG file composed of multiple layers which may, or may not, be displayed. Layers have a type and ID.


  There are 3 types of layers: signs, arrows, and backgrounds.  A layer id is a number unique to layers of the same type in the SVG.

Most bytes of header &h61 are understood.

Pictures are in jpg , png or svg format and encrypted - see 0x37

The height and width of pictures follow the header.

JCV Header &h61
00 Header Length 2
02 GARMIN JCV  
oc version? 2
0e year 1
10 month 1
11 day 1
12 hour 1
13 minute 1
14 second 1
15 ID  
21 Pointer to JCV1 containing ids 4
25 Length of record 2
27 length of block 4
2f Pointer to JCV 2 4
33 Length of block 4
37 encryption bytes to decode picture blocks 4
3c Pointer to JCV3 4
40 Length of block 4
44 Pointer to JCV4 4
48 Length of block 4
4c   2
50   2
52 Pointer to JCV4 4
56 Length of block 4
5a ?  
62 base value for 0x64 - bytes for width & hight 2
64 multiples of 0x62 denoting number of picture sizes to follow 2
66 ?  
6c width of pictures 4
70 height of pictures 4