The Baja North map covers from the boarder (with a small section of southern California included) to Guerro Negro.  There are awesome topo details like mountain regions, washes and other water spots, dry lake beds, and elevation.  Nat. Geo offers a scale of 1:450,000 with a latitude/longitude grid. 

I took a trip south in my van (Beluga) with surfboards and dirt bikes playing all the way to Cabo and back.  My AAA map was destroyed half way into the trip (from use & mis-use) as we drove our way from oasis to oasis.  The National Geographic map is ruggedly worthy.... crumple it up, smooth it back out, find it under your tools in the backpack - even spill a little Negra Modelo on it (or a lot)..... it cleans up nicely with no tears & minimal wear!  It has been Lizard Lady abused and is still in use!