Card / Program Help

Gents,

Chasing someone with a card reader and planner programmes local to Fremantle area if possible, have 2GB SD with some GPS marks I need to access. I’m not sure of the maps or file format…Cmap or Navionics.

Thinking of purchasing a card reader, will it give me any idea what map / file format type is on it if accessing through home PC ?...

Any help advice appreciated.

Coolbellup area - Brock 0421607986