Checked against the Japan Coast Guard’s official pages and the Government of Japan’s public relations site on 18 September 2026. How well 118 is staffed for non-Japanese speakers can vary by region and time of day, so where the official pages don’t confirm a detail, this article says so rather than guessing.

Most visitors to Japan already know to call 110 for police and 119 for fire or an ambulance. Fewer know there’s a third number, used only for the sea: 118, run by the Japan Coast Guard. If your trip includes a ferry, a fishing charter, diving, or snorkeling off Okinawa or anywhere else on the coast, this is the number that actually gets a coast guard boat or helicopter moving — not 110 or 119.

118 covers accidents and crimes at sea, not on land

The Japan Coast Guard has operated 118 as a toll-free, no-area-code line since May 2000. It’s meant for maritime accidents and incidents: someone who hasn’t surfaced from a dive or a swim, a boat that’s taking on water or has broken down, a collision between vessels, and also non-accident reports like a suspicious boat, smuggling, or an oil spill. Ishigaki, in Okinawa, is a documented example of where this actually gets used — the coast guard has logged 118 calls there for snorkelers who went missing off Kabira Bay and swimmers who lost consciousness offshore. If the emergency is happening on the water or the coastline, 118 is the direct line; calling 119 for a marine drowning still tends to reach help, since Japan’s fire and coast guard dispatch centers coordinate with each other, but 118 is built specifically for this.

When you call, the operator wants three things: when, where, what happened

The Japan Coast Guard’s own guidance keeps it simple: state when, where, and what happened, as clearly and calmly as you can. You don’t need formal Japanese — a location (a beach name, a dive shop’s name, or GPS coordinates from a phone) and a plain description of the emergency are what the operator is listening for.

The Coast Guard hasn’t published confirmed English phone interpretation for 118

Japan’s fire agency has a well-documented three-way interpretation system for 119 calls, connecting a telephone interpreting center so an operator, a caller, and an interpreter can all talk at once. The Japan Coast Guard’s own pages for 118 don’t confirm the same setup is in place for maritime calls. That may simply be a gap in what’s published rather than a real gap in service, but it isn’t something this article can confirm either way — so if you can’t communicate in Japanese, keep it to the basics (location, “help,” “drowning,” “boat”) rather than assuming an interpreter will automatically join the way one does on 119.

Two features do work in your favor even without spoken Japanese. Live118, launched in January 2025, lets you send live video from your phone to the operator during the call, so they can see the situation directly instead of relying only on your description. NET118 is a separate text-based reporting option originally built for people who are deaf or have a speech impairment — but it requires registering your details in advance through a QR code or email, so it isn’t something you can set up in the moment of an actual emergency.

Here’s the part that matters if your data plan doesn’t include voice calling

Placing an emergency call at all requires an active voice line, not just mobile data. Many tourist eSIMs are data-only. Before you’re out on a boat or in the water, it’s worth confirming whether your specific plan includes voice calling — and if it doesn’t, knowing in advance that you’ll need to rely on a companion’s phone, the crew’s radio, or a plan that does include a voice line.

Almost every call the Coast Guard receives on 118 is a wrong number, a silent call, or a prank

This is the detail that surprised us enough to include it: in April 2024 alone, the Japan Coast Guard’s own published statistics show it received 33,868 calls to 118, and 98.9% of them were invalid — misdials, silent calls, immediate hang-ups, or pranks. Genuine reports of maritime accidents made up less than 1% of that month’s calls. This has been a consistent pattern for years, not a one-off. It says nothing about whether the line works when a real emergency comes in; it just means the number gets misdialed constantly, so operators are used to sorting real calls from noise. It’s a reason to remember the number correctly rather than a reason to hesitate using it.

How Travel AI Rescue helps

Travel AI Rescue keeps 118 correctly separated from 110 and 119 in the app, so you’re not guessing which one applies when something goes wrong on the water. It can generate a card stating your situation in Japanese — a missing swimmer, a boat in trouble — for the first seconds of the call, before any interpreter, if one becomes available, joins. It also runs an offline diagnosis if your eSIM itself is the problem, and keeps your passport and emergency contacts readable on the device with no signal at all. It doesn’t replace the call itself, and dispatch and rescue are handled entirely by the Japan Coast Guard. (The Coast Guard, not this app, decides what response an incident receives.)

Sources

• Japan Coast Guard, “海の『事件・事故』は118番” (Report Sea Incidents and Accidents to 118). https://www.kaiho.mlit.go.jp/doc/tel118.html (accessed 2026-09-18).
• Japan Coast Guard, “118番通報実績” (118 Call Statistics). https://www.kaiho.mlit.go.jp/doc/tuuhoujisseki.html (accessed 2026-09-18).
• Government of Japan Public Relations Online (gov-online.go.jp), “『118番』は海上保安庁への緊急通報” (118 Is the Emergency Line to the Japan Coast Guard). https://www.gov-online.go.jp/article/202506/entry-7901.html (accessed 2026-09-18).