The red dashed lines on the map show groupings of islands, and do not accurately reflect maritime boundaries.
The telephone codes shown above are either international country codes (e.g., +596 for Martinique) or North American area codes (shown as +1 XXX). The two-letter codes are ISO 3166-1 codes, most of which are also in use as Internet top-level domains. However, the old AN code for the former Netherlands Antilles is still being used during the phase-in of the new codes (SX for Sint Maarten, CW for Curaçao, and (BQ) for Bonaire, Sint Eustasius, and Saba). SX and CW are already in use on the Internet; BQ may be activated some time in 2017 or 2018. Also, the French islands of BL Saint‑Barthélemy and MF Saint‑Martin continue to use .gp (Guadeloupe) or .fr (France) for Internet domains.
Time Zones are shown in the same format used on the US/Canada map. To convert to international format (offset from UTC/GMT), subtract 12 hours from the time shown; for example, 7:00 (Eastern Standard Time) is UTC–05:00. The Bahamas, Bermuda, Cuba, and Haiti observe daylight saving time on the same schedule as the USA and Canada. From the second Sunday in March until the first Sunday in November — for example, from 2016‑03‑13 until 2016‑11‑06, or from 2017‑03‑12 until 2017‑11‑05, or — those areas are one hour later, as indicated by the sunburst icon. The rest of the year, they are on standard time, indicated by the snowflake icon. The Cayman Islands began observing DST in 2016, using the same dates as the USA and Canada. The other islands all observe standard time year-round. Note that the Turks & Caicos Islands changed to Atlantic Standard Time (UTC–04:00, or 8:00 in LincMad notation), year-round. The Turks & Caicos no longer observe DST. Also, Venezuela has created its own time zone, halfway between Colombia to the west and the islands to the north and east.
Details about the Caribbean area codes and other nearby country codes are presented in table format on a separate web page. As of 1999‑05‑31, only DO Dominican Republic continues to use area code +1 809, now overlaid with +1 829 and +1 849. Note that PR Puerto Rico's +1 787 was overlaid with +1 939.
Although BM Bermuda is, strictly speaking, in the Atlantic Ocean (about 1000 km east of South Carolina) rather than in the Caribbean Sea, it is included on the map because it shared the old North American area code +1 809 until 1996. Bermuda is now +1 441; +1 809 is now only DO Dominican Republic.
Check out my political blog at LincMad.blogspot.com.