Search & Rescue needs mapping software for a laptop

Hello,

I am a land search operations manger here in the US. I would like some type of software that shows me topo maps of the area. The catch is we sometimes go places where there is no cell or Internet coverage. So they would need to be preloaded. Virgina maps would be about it. I have the DeLorme Earthmate BT-20 currently and its running Microsoft Streets and Trips 2009 with some other proprietary software on a mounted laptop in car. Any suggestions?

Also if you think of something else that may be useful to sar let me know.

Thanks!

Check DeLorme Topo 8 or Garmin Mobile PC plus the Garmin topo maps for your region.

...ken...

What he said! But my preference would be DeLorme.