Just noticed you also asked here, so you’ll get your answer in the reply to your email too.
For that area you will need C-MAP charts. Here’s a video on how to purchase and install them. Make sure you pick the region that works best for your future cruising plans. There are three regions that include Antigua:
M-NA-M027 - CENTRAL AMERICA AND CARIBBEAN
M-NA-M035 - PACIFIC COAST AND CENTRAL AMERICA
M-NA-M033 - ATL. COAST, GULF OF MEXICO & CARIBBEAN