Navigon 1200 GPS-navigator

I'm a newbie in GPS forensics and I'm doing a forensic investigation on a Navigon 1200 GPS-navigator and would appreciate help and ideas on how to understand information that I found.

In the folder called ROUTES I found a file called CITY VIEW.route - in that file I found about 5 adresses and very many numbercombinations (see example below).

218 462 218 732 218 712 218 722 218 752 235 942 238 432 238 412 238 422 238 402 238 302 238 392 216 112 218 382 218 332 218 322 218 312 218 372 218 362 218 402 216 172 216 162 216 152 216 122 216 422 216 412 216 142

Does anybody know what these posts mean? I've googled the GPS-model to find information on how to extract information but without success.

Thanks,
Mike