Source for Mexico Bathymetric Charts?

This is kind of a longshot, but I was wondering if anyone had any sources for bathymetric charts for Mexico.  I'm going there next week and I'm bringing a modicum of fishing gear (but not a depthfinder - too heavy).  I will rent a kayak and fish off the beach.  Went out one day last year and did pretty well.  I plan to do more this trip, provided the weather cooperates.

Anyway, I'd love to see a depth chart for the water surrounding the town of Sayulita:
http://g.co/maps/xvfp9

Tried the Navionics iphone app for the Carribbean and S. America.  It has this area but there is no detail   $14.99 down the drain.

I dunno about iPhone, but on Android they let you get a refund within an hour or 24 hours or something like that.

Good thought - I'm going to give that a try

I envy your lifestyle brotha Rory!