Guides: how to read real-time data
Why is the metro missing? What does an aircraft's altitude mean? The data behind the map, explained.
The map pulls data from many different sources, and each has its own quirks: how often it updates, how accurate it is, and what it simply does not cover. These guides explain what you are actually seeing on the map — and why something is missing.
Electricity price by price area: why north and south pay so differently
On an ordinary evening, electricity can cost fourteen times more in south-western Norway than in northern Norway. The power flow on the map shows why.
Traffic cameras along the road: where they are and how fresh the images are
The Public Roads Administration has almost 900 cameras along the roads, and most take a new image every minute. Here is how to use them.
Helicopters over Norway: ambulance, rescue and offshore
Who is flying low over the house at night? About the helicopters on the map, and why many of them are not shown.
Sanctioned ships on the map: what the list is and what it does not say
The map can mark ships on the US sanctions list. Here is how the match is made, and what it does not mean.
Ferries in real time: two sources and why some crossings are missing
The ferry appears on the map twice, from two sources with their own gaps. Here is how they fit together.
The departure board at the stop, explained
Tap a stop and you get the departure board from there. Here is what each part of it means.
How to follow your bus in real time
Twelve county transport companies send their bus positions. Here is how to find your bus on the map, and where it does not work.
Why Oslo's metro is not shown on real-time maps
The Oslo metro is not on any real-time map, and it is not the maps' fault. Here are the measurements that show what Ruter actually shares — and what it does not.
How "+4 min" on the bus comes about
The delay is the difference between the timetable and the bus's own updated estimate. Here is the whole chain, from the bus to the number on the screen.
Why ships stand still in the middle of the sea
A ship that does not move on the map is usually not at rest — it is out of coverage. About how ship positions are actually collected.
Why some aircraft are not shown on the map
The plane you see in the sky but not on the map is rarely anything mysterious. About ADS-B, volunteer receivers and the gaps between them.
Aircraft altitude is not the distance to the ground
The altitude on the map is measured with a barometer, and above a certain height it is not height above sea level at all. Here is why that is deliberate.
The colours in the police log, explained
Red, orange, yellow, purple, blue, green and grey — what the police's own categories mean on the map.
How to add Kartradar to your home screen as an app
Kartradar can be used as an app without downloading anything: its own icon, straight into the map and no address bar. Here is how on Android and iPhone.