The five previous logs is a PQ limitation. If you want all the logs, press the refresh button while displaying the cache in c:geo. It's also possible to refresh all caches - from the Stored caches display press Menu -> Manage -> Refresh all (this will be slow). I'd suggest doing this only if you have saved a small number of caches.
Offline maps are supported in c:geo with Open Street Map. The c:geo FAQ explains how to do this.
Sorry I was off the forum for a few days getting a replacement N7--my screen stopped responding to touch. I followed your suggestion to display all the previous log entries and I think it will work OK if there is not a large amount of logs. I first tried it on an older, easily found cache and the action caused the app to stop running. With a newer and less found cache it worked well.
I followed the link for the OSM, but it refers to an SD card--which the N7 does not have. Are or will there be specific instructions for N7? On some caches I get maybe the top 1/4 of a map offline and on others, nothing.