What this itinerary involves
The Eastern Caribbean is the classic sun-and-sea itinerary: two or three island calls, a couple of full sea days, and a lot of time on a ship in open water between them. Unlike the Mediterranean, the islands here are genuinely far apart, and the water between them is empty in a way the Aegean is not.
The sea-day arithmetic
This is where the sea-day ratio starts to matter properly. Two full sea days out of seven is nearly thirty per cent of your trip with no land network within reach at any price. That is enough to make a maritime plan a real purchase rather than an afterthought, and enough that the ship’s Wi-Fi pricing — $16 to $40 per device per day — becomes a genuine budget line.
Day-by-day data ledger
An eight-day Miami round trip calling at Nassau and St Thomas — the classic Eastern pattern. Sailings from Port Canaveral or Fort Lauderdale run the same shape with an hour or two of difference at each end.
| Day | Where | Ashore | What works | Data |
|---|---|---|---|---|
| 1 | Miami — embarkation Embarkation | 5h | Your US plan until the ship clears the Florida coast in the evening | 350 MB |
| 2 | Nassau, Bahamas Port call | 8h | Bahamian networks ashore. Note this is not US domestic coverage — a US plan roams here unless the Bahamas is explicitly included | 500 MB |
| 3 | At sea — open Atlantic, southbound At sea | — | Maritime eSIM or ship Wi-Fi only — no land eSIM works, at any price, on any network | 250 MB |
| 4 | At sea — open Atlantic, southbound At sea | — | Maritime eSIM or ship Wi-Fi only — no land eSIM works, at any price, on any network | 250 MB |
| 5 | Charlotte Amalie, St Thomas (US Virgin Islands) Port call | 9h | US territory — most American carriers treat this as domestic, so many passengers need no extra plan at all for this one day | 600 MB |
| 6 | At sea — open Atlantic, northbound At sea | — | Maritime eSIM or ship Wi-Fi only — no land eSIM works, at any price, on any network | 250 MB |
| 7 | At sea — open Atlantic, northbound At sea | — | Maritime eSIM or ship Wi-Fi only — no land eSIM works, at any price, on any network | 250 MB |
| 8 | Miami — disembarkation Disembarkation | 4h | Your US plan from arrival | 150 MB |
| Totals across 8 days | 26h | 4 days with no land network · 50% of the trip | 2.6 GB | |
What the ledger shows that the average does not
Four full days with nothing to connect to, against seventeen hours ashore across two calls. That ratio is the reverse of the Mediterranean itineraries and it is what makes this the strongest case on the site for buying a real maritime plan. The islands here are hundreds of miles apart and the water between them is genuinely empty.
Read down the data column and the split is stark: about 1.6 GB of the 2.6 GB is spent ashore across 26 hours off the ship, and roughly 1.0 GB is spent on the 4 days when no land network exists. Those two numbers buy different products at very different prices per gigabyte, which is the entire reason this site separates them.
Read the data column as a working estimate for normal holiday use: navigation, messages, email, a scroll through a feed and a few uploads. Nobody in it is watching television. Add video and the ashore figures roughly double while the at-sea figures stop being predictable at all. Metered maritime data is the one place on a cruise where a single evening of streaming can cost more than the plan did.
What to buy for this itinerary
The maritime plan is the purchase, not the top-up: roughly a gigabyte across four sea days at ordinary use. The shore side is unusually cheap because one of the two calls is US territory — check your existing plan before buying anything for St Thomas.
Port by port
| # | Port | Country | Local carriers | Coverage note |
|---|---|---|---|---|
| 1 | Nassau | BS | BTC (Bahamas Telecommunications Company), Aliv | Prince George Wharf sits in central Nassau with strong BTC and Aliv coverage across the whole downtown and Paradise Island area. Coverage is dependable but roaming into Bahamian networks from US plans is often expensive without an eSIM. |
| 2 | St Thomas | VI | AT&T, T-Mobile, Viya (US Virgin Islands networks) | Havensight and Crown Bay both have full US-carrier coverage — the USVI is US territory, so most US phone plans work here at domestic rates with no roaming charge and no eSIM needed. |
Plans for the sea days
With around 50% of this itinerary at sea, the maritime plan is the main purchase — so these are the larger allowances. Running out mid-ocean is the one problem you cannot fix from the ship.
GigSky — Cruise + Americas/Caribbean Unlimited 15-day🟢 Works at seaUnlimitedOur #1 pickBest valueCode ESIMDUDE⚠️ Switches between the ship’s maritime network at sea and local networks in port — one eSIM covers both.
Get deal →$82.99≈ $5.53/day- GigSky — Cruise + World Unlimited 15-day🟢 Works at seaUnlimitedOur #1 pickCode ESIMDUDE
⚠️ Switches between the ship’s maritime network at sea and local networks in port — one eSIM covers both.
Get deal →$82.99≈ $5.53/day - GigSky — Cruise - At Sea Only Unlimited 15-day🟢 Works at seaUnlimitedOur #1 pickCode ESIMDUDE
⚠️ At-sea data only — no coverage in port. Cheaper than Cruise + Land if you already carry a regional eSIM.
Get deal →$82.99≈ $5.53/day - GigSky — Cruise + Americas/Caribbean Unlimited 7-day🟢 Works at seaUnlimitedOur #1 pickCode ESIMDUDE
⚠️ Switches between the ship’s maritime network at sea and local networks in port — one eSIM covers both.
Get deal →$44.49≈ $6.36/day
Plans for the port days
One regional eSIM covering BS, VI handles every stop on this route. Our picks:
eSIM.dogCheapest way to cover St Maarten and San Juan if your own plan does not.
Code DUDEADVICE5
AiraloBroad island coverage in one pack; note US carriers already cover St Thomas for free.
EsimCardsBefore you buy for this itinerary
Numbers first, product second. Put the sea-day count above through the data calculator, which sizes it against your own habits rather than an average. Then check the hardware with the compatibility checker — both take under a minute, and a phone that cannot install a profile makes every price on this page irrelevant.
The alternative to all of this is the ship’s own package, and it is only ever worth comparing against a real figure. Every rate we track is in the Cruise Ship Wi-Fi Price Index, published under an open licence so you can check the arithmetic rather than take ours. Multiply the day rate by the number of phones in your cabin — that is where the ship’s pricing model stops looking reasonable.
One thing this page is not about: working at sea. Crew, survey and offshore-energy connectivity runs on different networks with different contracts — the offshore guide covers that.
Eastern Caribbean (7 nights) FAQ
01Is St Thomas covered by my US phone plan?+
For most US carriers, yes — the US Virgin Islands are US territory and are usually billed as domestic. Nassau is not, and neither is any of the water in between. That makes this itinerary unusually cheap on the shore side and unusually expensive on the sea side, which is the opposite of what most passengers budget for.
02What happens on four consecutive sea days if I buy nothing?+
You are on the ship Wi-Fi or you are offline. At $16 to $40 per device per day that is roughly $64 to $160 per phone for the four days, and a couple with two phones is looking at the higher end of that twice over. A maritime eSIM sized for a gigabyte across the same four days costs a fraction of it, which is why this itinerary produces the largest saving of any we cover.
03Does my US phone plan already cover Eastern Caribbean ports?+
Partly, and it is worth checking before you spend anything. Puerto Rico and the US Virgin Islands are US territory, so many American carriers include them at domestic rates. St Maarten, Antigua and the rest are not, and neither is any of the water in between. The honest sequence is: check your existing plan, buy a regional eSIM for the gaps, then buy a maritime plan for the two sea days.
04What eSIM do I need for a Eastern Caribbean (7 nights) cruise?+
You need something for the 2 port calls and something for the hours in between, because no single land eSIM does both. GigSky Cruise + Land is the one product that spans them; otherwise pair a maritime plan with regional coverage of BS, VI and remember to buy both before you sail.
05Which countries does the Eastern Caribbean (7 nights) itinerary visit?+
Nassau (BS), St Thomas (VI). Check any regional plan lists BS and VI by name rather than trusting the region label on the box.
06How many sea days does a Eastern Caribbean (7 nights) cruise have?+
Roughly 50% of the itinerary — the majority, which makes at-sea coverage the main purchase.