Does anyone know of any software out there useful for mapping dive sites? Freeware would be great. 
I'm looking for something that will allow me to diagram wreck sites, coral formations, dive site stuff in general for future reference. There's no particular project in mind here.
So far my google searches and here on SB haven't turned up anything useful.
Thanks in advance.

I'm looking for something that will allow me to diagram wreck sites, coral formations, dive site stuff in general for future reference. There's no particular project in mind here.
So far my google searches and here on SB haven't turned up anything useful.
Thanks in advance.