This map covers area from the main Pfeiffer State Park entrance and Lucia
 
The map has been preset for Gamboa/Potters/3palms beaches
 
The 3 markers are adjustable to measure other areas on the map.

Position 2 markers where the swells become blocked by the coastline

the blue one at the northern boundary
the yellow one at the Southern boundary

and the red one on the location you want to measure