Friday, 30 May 2008

Navman iCN320 Sat Nav device

I have previously written elsewhere a guide to investigating TomToms and of course there is TomTology and the paper by Beverley Nutter of the MPS out there as well.

Today I had a Navman iCN320 sat nav come my way.

After a brief look it seems that the crucial three files are within the SYSTEM directory:
  • RECENT.DAT
  • FAVVER4.DAT
  • ROUTE.DAT
They are stored on a 256mb MMC card formatted FAT16.

RECENT.DAT stores up to thirty of the recently navigated to destinations. These destinations are stored in records of 520 bytes in length. Each destination has its Lat/Long coordinates stored in 8 bytes starting at Record Offset 507. These are decoded by bookmarking in Encase as a 32 bit integer. In the UK Latitude will begin in the range 49-59 and is decimally notated. Longitude is in the range -5 to +1.6 ish. When bookmarking as a 32 bit integer Longitude is shown first and will often be a negative value (i.e. anywhere west of Greenwich).

FAVVER4.DAT possibly stores up to 200 user entered favourite destinations. These favourite destinations are stored in records of 1508 bytes in length. Each destination has its Lat/Long coordinates stored in 8 bytes starting at Record Offset 352. These are also decoded by bookmarking in Encase as a 32 bit integer.

ROUTE.DAT I speculate is used to store the origin of the last navigated journey. Coordinates can be found at record offset 507.

GREP search expression for Encase ......[\x4f-\x55]\x00

Looks like a bit of testing is in order!

1 comment:

crofty said...

anyone had joy with icn330? I picked one up without the sd card from an auction. hoping i not made a bad buy,took gamble.
I got a sd card from ebay hoping it would work but no luck ebay item #220354088591