GPS jamming over Japan

Updated 28 October 2026, 08:00 UTC

In the update of 28 October 2026, 08:00 UTC, 138 hexagons had enough aircraft to measure. 34 showed high interference (over 10% affected).

Flights on 27 October 2026. The map is rebuilt once a day from the previous day's flights.

The live map

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Embed this map

Paste this where the Japan map should appear. It is free to use and updates by itself.

<iframe src="https://gpsinterference.com/embed?region=japan" width="640" height="400"
        style="border:0;width:100%;max-width:960px" loading="lazy"
        title="Live GPS interference map: Japan"></iframe>
<p>Live map: <a href="https://gpsinterference.com/">GPS Interference</a></p>

Open the embed studio to choose the map style, altitude, height and place names, and see a preview.

Most affected areas

Place	Share affected	Aircraft affected
Open sea 43.8°N 143.8°E	28.6%	2 of 7
Open sea 43.6°N 142.3°E	27.3%	3 of 11
Open sea 42.8°N 143.3°E	25.0%	1 of 4
Open sea 43.2°N 142.3°E	23.8%	5 of 21
Open sea 42.8°N 142.3°E	21.4%	9 of 42

With few aircraft, one report can give a hexagon a high share; see the limitations.

Today in numbers

1,499 of 22,381 aircraft observations (6.7%) reported low accuracy. An aircraft counts once in each hexagon it crossed.

Hexagons by level, latest update
Level	Share of aircraft affected	Hexagons
High	over 10%	34
Medium	3–10%	78
Low	under 3%	26

By altitude

All altitudes: points to a powerful, wide-area source. How this is read.

Aircraft observations by barometric altitude, latest update
Altitude	Aircraft	Share affected
Below 5,000 ft	2,440	8.0%
5,000 to 15,000 ft	4,138	8.4%
15,000 to 30,000 ft	7,038	6.8%
Above 30,000 ft	15,020	5.7%

An aircraft is counted in each layer it crosses, so the rows do not add up.

Area covered

This page counts only the hexagons whose centre lies inside Japan's borders, so hexagons in neighbouring countries and out at sea are left out. The map is framed on 24°N to 45.6°N and 122.9°E to 146°E.

Background

For the reporting on interference in this area, and who it is attributed to, see the East Asian seas.

Thunderstorms over the South China Sea from the International Space Station

About these figures. Low reported accuracy points to interference but does not prove it, and the map cannot locate a transmitter or say who is responsible. How the map is made.