If you go to the california fish and game web page it has the areas in red and blue as to where and what you can fish. it is set up by gps cords. I don't have gps and i just go off the point of lj and then there is a street nautilas or something like that that is the start of the other red and blue areas. if you just f
amilurize youself with the surrounding area via google map you can kind of determine where you are at on the water. Also if you got a decent phone and put it in a ziplock or have a water proof case you can check it to make sure you are where you need to be or not be.
http://www.dfg.ca.gov/mlpa/