Initial impressions are not so great. I still haven't discovered a way to zoom in & out of each map loaded, and the maps seem accurate enough but I suspect that they are scanned versions of the USGS topographic maps.

I have a 16GB microSD in my 8820, which I loaded the first part of their map package which takes over 4GB of space and consists of over 1200 map files.

After loading the maps on the microSD card, you need to open the program and rebuild the map index. The program then warns you that it could take up to 30 minutes, but I suspect that it took my BB over 45 to index all the maps. Granted, I did not let it sit with TopoExplorer as the active application until about the 30 minute mark, but even still that is a long time for an application to load. Thank goodness you only have to re-index when you load new map files.

Once the indexing is finished you can click the command "Load optimal map" which then synchronized with the internal GPS to pick up the best map of your location.

A little bit of scrolling around shows a pretty large area but I think this may have been a waste of $29 if there is no way to zoom.

I'll send an email to the company and see if there is just something I'm missing, but I suspect that what I see is what I get. Perhaps in the second download package there is a more detailed tutorial than the pdf provided with the original "free" applcation, but I suspect the singular crippling flaw of this app is the lack of zoom.

Part two of the review to come...