Anybody have any insight on this?

The map tiles use a format that looks like:
publish0.geogarage.com/noaa/tqtrtt/tqtrttq.png

Different areas/zooms change around the last 3 letters of the png file, but always seems to be the letters 'r' 't' 's' or 'q'. Also, I've seen publish1, publish2, and publish3.

The linz maps follow a similar format, linz/tsrrq.

I've been able to find noaa maps elsewhere, but this is one of the few sources of linz (New Zealand's version of NOAA) that may be compatible with Maemo Mapper.