The location is west of the volcano at San Quintin Bay. I would call "The Old Mill" to see if he was staying there tonight since that is very close to his last location. There are usually off roaders staying at the Old Mill that might be able to check on your husband's well being. Hope this helps you out........
Old Mill Information
San Quintin, Baja California
1-800-479-7962 (toll free from the U.S.A.)
01-800-025-5141(toll free from Mexico)
Fax 011-52-616-5-33-76 (Mexico)