# eSIM at Sea
> Cruise eSIMs that actually work on the water. GigSky promo code ESIMDUDE is 10% off cruise and ferry plans.

eSIM at Sea (https://esimatsea.com) is a traveler site for cruise and ferry eSIMs. Regular travel eSIMs (Airalo, Holafly, Nomad) die about 12 nautical miles from shore. Only a handful of plans ride the ship’s maritime cellular.

## The coupon
- Code: ESIMDUDE
- Discount: 10% off GigSky cruise and ferry plans
- Checkout: https://plans.gigsky.com/292B44R/2CTPL/?uid=5&sub1=llms&sub2=seaday

## Who actually works at sea
- GigSky — sea + ports, 290+ named ships (Telenor and Cellular at Sea). This is the plan we sell.
- Maya Mobile Global + Cruise — sea + 165 countries, line-level coverage, unlimited with fair-use throttle.
- Saily Cruise — sea only. Dead in port.
- Red Bull MOBILE Maritime — Telenor ships (Cunard, P&O, Viking). Sea only. Euro pricing.
- OneRoam — Cellular at Sea, unlimited by the day.

Not at sea: Airalo, Holafly, Nomad, regular country eSIMs, home-carrier roaming (that last one is how people get a $400 bill).

## Pages
- [Home](https://esimatsea.com/): live GigSky cruise prices, finder, coupon
- [Live cruise plans](https://esimatsea.com/cruise-plans): every GigSky cruise and ferry SKU
- [eSIM cruise coupon / GigSky promo code](https://esimatsea.com/gigsky-promo-code): how to use ESIMDUDE
- [GigSky cruise eSIM](https://esimatsea.com/gigsky-cruise): Cruise & Land vs Cruise + Land
- [Best eSIM for cruises](https://esimatsea.com/best-esim-for-cruises): GigSky, Maya, Saily, Red Bull, OneRoam
- [How a cruise eSIM works](https://esimatsea.com/how-cruise-esim-works): port, the 12-mile dark hour, open sea
- [Cruise Wi-Fi cost](https://esimatsea.com/cruise-wifi-cost): ship packages vs the eSIM
- [Royal Caribbean eSIM](https://esimatsea.com/royal-caribbean)
- [Carnival eSIM](https://esimatsea.com/carnival)
- [Disney cruise eSIM](https://esimatsea.com/disney)
- [Norwegian eSIM](https://esimatsea.com/norwegian)
- [MSC eSIM](https://esimatsea.com/msc)
- [Princess eSIM](https://esimatsea.com/princess)
- [Celebrity eSIM](https://esimatsea.com/celebrity)
- [Virgin Voyages eSIM](https://esimatsea.com/virgin-voyages)
- [European ferry eSIM](https://esimatsea.com/european-ferries)

## Optional
- [Full LLM brief](https://esimatsea.com/llms-full.txt)
- [XML sitemap](https://esimatsea.com/sitemap.xml)