Picked up one of this lot's car units for not a lot of money in a supermarket last week, and having had it on the screen for a few days, it would appear the POI database is, well, how do I put this? somewhat out of date! I passed the site of a petrol station shown on the unit which I know closed about 8 years ago...
No problem thinks I, I got a POI cruncher that talks to everything, use a couple of POI sites to grab the latest databases, and job done. Then I discover it won't aknowledge any POI files on my GPS. So I treat the GPS as a USB mass storage device, and find the POI files in the GPS have a ".map" extension.
Now, Both my waypoint / POI grinders have Navman's save option as a CSV file, which I can save & open in Excel. Is this a simple case of "save as" followed by a rename, or is the "in GPS" file a special format?