Four to eight miles is a good seek range for radar, but also 1, 1/2, and 1/4 miles for trying to find the landmarks in a dark and stormy anchorage - especially the ones that act as range markers. Found radar also useful for trying to work out the antics of the shrimp boats as they dance around you. Not very useful for finding dark pangas which are either wood or fiberglass
I had a Furuno
8 and then a 16 mile LCD radar with the monitor
mounted in the cockpit
that worked out well. Now I have a 36 mile Furuno
so I can see mountaintops far far away...
Large vessels in the upper Sea are essentially the Santa Rosalia/Guaymas ferry
and the ore boat that goes to San Marcos Island (near Santa Rosalia). Anything else is usually Navy
of one stripe or another and presumably they see you...
Bring sunbrella or nursery cloth and a grommet kit to make shade.