The easiest thing is to go to Garmin and buy a mini-SD card loaded for Costa Rica. I say that assuming that they'll have one. I bought one from them for Mexico several years ago when we went to Guad.
Bill
Nodwell RN110 out moose hunting. 4-53 Detroit, Clark 5 spd, 40" wide tracks, 10:00x20 tires, 16,000# capacity, 22,000# weight. You know the mud is getting deep when it's coming in the doors.