Anyone know of software like Google Earth that can be downloaded and used offline to markup, etc like you would in google earth for example locations of cache's, bo locations, areas to avoid, and other planning maps? Preferably one that runs on linux? Thanks ahead of time... J. Kelly
National Geographics make some very good stuff that uses USGS MapSets, and is setup to distribute these MapSets by State.... I use the Alaska State Version extensively.... and it interfaces with a GPS TrackLog to show a Route, as well as Elevations Change Profiles.... the Mac version is called "ToPo" and I know there is a Windows version, for sure....
I go old school with Delorme Atlas & Gazetteers. You'd be surprised how accurate one can be with just a map & compass. I make coded notes with colored pencils. "Good spot for lunch" can have a completely unrelated meaning and that phrase does not appear in any atlas I have. I also use a standalone GPS, the little icons one can use for waypoint markers have coded meanings. Not exactly what the OP is looking for but its nice to have options.
Gesko - I will check out OpenMaps.... NotSoSneaky - that's a good idea... I'll have to pick one up sometime soon.
I have a Magellan meridian gold GPS, they are now obsolete, but still work well and do metro or turn by then directions (depending on which software you load). I have seen them on eBay complete with all cables, window mount, power 12vt for car use, for about $40. They have the marker icons as well, and visable or invisible waypoints. Flip the switch and it goes primarily water, for those mishaps at sea.
Marble Marble (software) - Wikipedia, the free encyclopedia for Linux should be able to use map data from OpenStreetMap offline
ViewRanger for iPhone and andriod as well (I think). I use this it for backpacking and it's pretty nice.