I still think getting more satelliteimages /maps options would be great as is some area satellite images offered by Google are blury, cloudy, etc. For the map side of things, OpenTopoMap maps are really good background and anyone can be an editor, so if the maps of the area isn’t detailed enough, we can add lots of features, which is not the case with Google Maps/Earth
I think the improvements of drawing frame is a great idea... if the export into info frame can include coordinates, altitude, and... surveyor list. Basically info we have already documented in the database and usually end up on the cave chart so we don’t have to rewrite everything again. Also.., if we could get a tool to create a UTM grid instead of drawing it line by line... One more thing is I like have my final drawings with UTM grid displayed but with True North pointing to the top... so I always have to rotate my drawings which is time consuming ( mainly to unrotate the text). would it be possible to do this automatically?
The benefit of exporting drawings as *.kmz overlays is the possibility to display them in Google Earth for PC/mobiles or GIS applications. All GIS applications like QGIS or ArcGIS are able to import *.kmz overlays. This tools are focused to manage various satellite images or maps.
About OpenTopoMaps:
I like this map in german topo style. On my Android I use Locus Map to display it online and offline. And the best, Locus Map could import *.kmz overlays.