Car Navigation in Japan: Mapcode, Phone-Number Search and the Google Maps Settings You Need

A Japanese street intersection with mountains rising in the distance

In Japan, the hardest part of a drive is often entering the destination, not the driving itself (illustrative image)

GoodCars works with local suppliers across Japan, and the same scene plays out at pickup counters every day: the driver types the address into the built-in navigation system, hits search, and gets nothing — or gets routed to a field two kilometres from the attraction. If you are used to typing a place name into a map app and having it just work, Japanese built-in navigation will surprise you. It runs on a different logic, and most visitors discover that only after they have driven away.

This guide does not repeat the paperwork and pickup steps already covered in the complete guide to renting a car in Japan. It covers one thing only: how to get the destination into the system correctly — the three input methods and when each one fails, how Mapcode works, why the map data in a rental car may be older than you assume, the Google Maps settings to fix before you leave, and the Japanese penalties for handling a phone while driving.

📖 What this guide covers

Phone-number search is the fastest method, but viewpoints, beaches, parks and many car parks have no landline registered, so the search comes back empty
Mapcode is pure digits, so it works in any language — 6 to 10 numbers place you within roughly 30 metres, and an asterisk plus one or two more narrows it to about 3 metres
Some units cannot accept the digits after the asterisk — enter only the part before it and you will still arrive
The map data in a rental car is not necessarily current: newly opened sections and ETC-only interchanges may be missing
In Google Maps, "avoid tolls" and "avoid highways" are two separate switches — flipping only one rarely gives you the route you wanted
Holding a phone while driving costs 18,000 yen and three demerit points for a standard car; causing danger is six points, enough to suspend a licence outright

Three ways to enter a destination — and when each one fails

Close-up of a car navigation screen showing a route map

Same unit, three input methods, very different success rates (illustrative image)

Almost every rental car in Japan offers the same three ways to find a destination. GoodCars has put the practical success rate of each into one table worth reading before you pull out of the car park.

Input method	How it works	When it fails
Phone number	Enter the landline of a business or facility, including the area code	Attractions, viewpoints, beaches, parks and some car parks have no registered landline; mobile numbers are usually not in the database
Mapcode	Enter 6 to 10 digits, plus an asterisk and one or two more for higher precision	A few units do not support it; some cannot accept the high-precision digits after the asterisk
Address	Drill down by prefecture, city, district and block number	Japanese addresses are block-based, not street-and-number based, so one block number can cover a large area — and the menus are usually in Japanese only

The takeaway for an international driver is blunt: the address method is the one you should rely on least. It is the slowest, the least precise, and the one that demands the most Japanese. GoodCars suggests looking up Mapcodes for the stops you genuinely cannot miss, and trying phone numbers for everything else.

💡 The point most guides miss: Mapcode and phone numbers are numeric. Even if the interface is entirely in Japanese, a number pad needs no translation. If you read no Japanese at all, this is your most reliable route into the system — far faster than fighting through Japanese address menus.

How to look up and enter a Mapcode

A smartphone in a windscreen mount showing a navigation route in daylight

Look Mapcodes up before you travel, not in a car park with one hand on the phone (illustrative image)

Mapcode converts a position on the map into a string of numbers, and every point in Japan has one — including places with no address and no phone number. The standard code is 6 to 10 digits and places you within roughly 30 metres. Adding an asterisk and one or two more digits narrows that to about 3 metres.

Do the lookups before you fly

Supported map sites and apps will show the Mapcode for any point you drop a pin on. GoodCars recommends collecting the Mapcodes for your whole itinerary before you leave home and keeping them in a phone note or on paper. The reasoning is practical: looking one up in Japan means you need mobile data and a free hand, and neither is a given at the roadside.

If the asterisk digits will not go in, you did nothing wrong

This is where drivers get stuck at the counter. Some units simply do not accept high-precision codes — there is no asterisk key at all. You do not need to look the place up again: enter only the digits before the asterisk and you will still land within about 30 metres, which is close enough to see where you are going.

Navigate to the car park entrance, not the centre of the site

Precision only helps if you point it at the right spot. Set the centre of a large attraction as your destination and the route may end on a service road with no entrance — a common outcome at big parks, aquariums and mountain facilities. The better habit is to look up the Mapcode of the car park entrance instead. This matters most in Okinawa, where entrances are often on the opposite side from the main gate; see the GoodCars Okinawa car rental guide for local detail.

Rental car maps are older than you think

Blue overhead direction signs above a Japanese city road with traffic

The signs on the road have been updated; the map inside the car may not have been (illustrative image)

Here is a problem few visitors are warned about: the map data in a rental car was not necessarily updated close to your travel dates. Expressway extensions, new interchanges and rerouted roads do not exist as far as an older map is concerned. In practice it shows up three ways:

A road that opened recently is treated as non-existent, so the system sends you off the expressway and around on local roads
ETC-only interchanges may not be flagged as ETC-only, and the route takes you straight into one
New facilities and new car park entrances cannot be found at all, leaving Mapcode or on-site signage as your only option

The GoodCars rule of thumb is built-in unit first, phone second, and when the two disagree, pull over before deciding. The single most useful habit is to plan the day's main route on your phone before setting off so you know roughly which roads you should be on; if the car sends you somewhere obviously longer, you will notice immediately.

🚧 Never reverse or change lanes at the last moment at a toll gate. If navigation puts you in a lane you should not be in, stop where directed and press the intercom for assistance. Reversing or turning around inside a toll plaza is one of the most dangerous things you can do on a Japanese expressway.

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Can you just use your phone? Yes — after three settings

A bright car interior with a navigation map displayed on the centre screen

Phone data is newer, the built-in unit keeps working without signal — use both (illustrative image)

Plenty of visitors drive Japan with the phone as primary navigation and the built-in unit as backup, and that works well. Three things need sorting out before you go, though, because discovering them mid-drive is too late.

1. "Avoid tolls" and "avoid highways" are different switches

This is the one most people get wrong. In the Google Maps route options, "avoid tolls" targets every road that charges, while "avoid highways" also removes expressway sections that are free. Turn on only one and the route you get is usually not the one you meant to ask for. Check both together, and remember the choice carries over to later searches.

2. The toll estimate is an estimate

Google Maps does show expected tolls in Japan, but Google itself describes the figure as an approximation, and roads whose rates vary by lane or time of day may show no price at all. For a real number, use the expressway operator's own fare calculator. For how much an ETC card changes that figure in the first place, see the expressway section of the complete guide to renting a car in Japan.

3. Download the offline map first

Offline maps can be downloaded for Japan, which is worth doing for mountain and island itineraries. Two limits matter: offline, only driving directions work — walking and public transport routing do not, and a downloaded area expires and refreshes only when you are back online. GoodCars suggests pulling down tomorrow's region on hotel Wi-Fi so that losing signal in the hills does not strand you. One more practical point for overseas visitors: none of this works without mobile data, so sort out a travel SIM, an eSIM or a pocket router before you land.

The legal line: look at navigation, never hold the phone

A phone held in a car mount showing the route ahead

The phone belongs in a mount; reprogram the destination only when parked (illustrative image)

This is the one section where getting it wrong has consequences beyond a wasted hour. Japan treats phone use at the wheel severely:

Offence	Fine (standard car)	Demerit points
Holding a phone, or gazing at a screen, while the car is moving	18,000 yen	3 points
Doing so and causing danger	Handled as a criminal matter, not a fixed penalty	6 points, enough for immediate suspension

Three habits keep you clear of it: keep the phone in a mount, do all typing and destination changes while parked, and follow the voice rather than watching the screen. If someone is travelling with you, hand navigation duties to the passenger. And a useful non-screen check: in Japan green direction signs mean expressway, blue signs mean ordinary roads, so a glance at sign colour tells you which network you are on.

Navigation language is an option you request when booking

Many visitors assume a rental car will come with an English interface. It often does not. Multilingual navigation — typically English, Chinese and Korean — is an add-on that has to be requested in advance, stock is limited, and asking at the counter is usually too late.

Request it at booking if you want a non-Japanese interface, rather than raising it at pickup
If none is available, you are still fine: Mapcode and phone numbers are digits, and a Japanese menu does not block you from entering them
Let the phone fill the gap — run your own language on the phone and use the built-in unit as backup and traffic display

GoodCars works directly with local suppliers, so navigation options and vehicle specifications for a given pickup point can be confirmed at the booking stage rather than discovered on arrival.

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Six pickup points: what navigation actually demands in each region

A country road between green fields and woodland under a clear sky

The more rural the itinerary, the more a pre-trip Mapcode list is worth (illustrative image)

The same navigation setup runs into different problems in different regions. This table tells you where to spend your preparation time.

Pickup point	Region	What matters for navigation
New Chitose Airport	Hokkaido	Long distances and patchy mountain signal — offline maps and Mapcodes both worth preparing
Fukuoka Airport	Kyushu	Urban expressways interleave with local roads — get the two "avoid" switches right
Narita Airport	Tokyo and Kanto	Dense junctions — follow the voice, not the screen, and let it recalculate if you miss an exit
Haneda Airport	Tokyo and Kanto	Elevated and surface roads overlap — trust on-site signage when the two devices disagree
Kansai Airport	Osaka and Kansai	City car park entrances are hard to find — look up the car park's own Mapcode
Naha Airport	Okinawa	Most sights have no phone number to search — Mapcode is effectively the local standard

That last row is not an exaggeration. Okinawan tourist information routinely publishes the Mapcode for a site, because beaches, viewpoints and sacred groves have neither a phone line nor a street number. For regional detail see the GoodCars Kyushu car rental guide and Kansai car rental guide; for long-distance and winter driving, the Hokkaido car rental guide.

Frequently asked questions

Q1. Do I really need Mapcodes? Can I not just type the address?

For city restaurants and hotels, an address usually works. For attractions, beaches, viewpoints and mountain facilities it often does not, or it lands you on the wrong side. GoodCars suggests preparing Mapcodes for the stops you cannot afford to miss and improvising for the rest.

Q2. How many digits should a Mapcode have?

The standard code is 6 to 10 digits and places you within roughly 30 metres, which is enough for driving. The asterisk and the one or two digits after it are only for finer precision. If the unit has no asterisk key, enter only the digits before it.

Q3. Why does phone-number search so often fail?

Because the unit matches against landlines recorded in its map database. Sites with no landline, and businesses that list only a mobile number, will not be found, and recently opened places may not be in the data yet. Switch to Mapcode.

Q4. Can my phone replace the built-in unit entirely?

It can be your primary tool, but leave the built-in unit running. Phone map data is newer; the car's unit keeps working where there is no signal. When they disagree, pull over to compare rather than working it out while moving.

Q5. Do offline maps work in Japan?

Yes, you can download an area. Note two limits: offline, only driving directions are available — walking and transit routing are not, and a downloaded area expires and needs a connection to refresh. Download tomorrow's region on hotel Wi-Fi.

Q6. Navigation sent me into an ETC-only lane. What now?

Do not reverse and do not turn around inside the plaza. Stop where directed and press the intercom; staff will tell you how to settle it. This usually happens because the map data is older than the road layout, not because you made a mistake.

Q7. I read no Japanese. Can I still use a Japanese-only unit?

Yes. Mapcode and phone numbers are pure digits, and a number pad needs no language skills. If you would rather have an English interface, request it from GoodCars when booking — stock of multilingual units is limited and cannot be guaranteed at the counter.

📌 About this article. Rules, penalties and product features described here reflect official guidance and market practice at the time GoodCars verified them. Japanese traffic law, map service features and rental company options all change, so always confirm against current Japanese regulations, each service's official documentation and the terms shown when you book.

One sentence to take away: in Japan, entering the destination wrongly costs more time than driving the wrong way. Look up Mapcodes for the stops that matter, understand the two "avoid" switches, download the offline area, and keep the phone in a mount — do those four things and the rest is just driving. GoodCars works with local suppliers across Japan and can confirm navigation options with your booking; the complete guide to renting a car in Japan covers the documents, costs and pickup process.

Car Navigation in Japan: Mapcode, Phone-Number Search and the Google Maps Settings You Need