US VFR Sectional Chart coverage extends south to between the 28th and 24th parallel over Mexico. At 85W (just west of Cuba) the coverage extends south to between the 16th and 14th parallel.
Image 1: VFR Sectional coverage.
NOTE: WAC Charts have been discontinued by the FAA so are no longer available in ForeFlight Mobile.
IFR Low charts are provided for most of Mexico and South to Panama City, Panama. From 78W east to 60W, coverage extends south to roughly the 12th parallel.
Image 2. IFR Low Chart coverage.
IFR Low charts are provided for Mexico and Central America. From 75W east to 5W (to west Africa), coverage extends south to roughly the -10th parallel.
Image 3. IFR High Chart coverage.