Recording GPS tracks requires a GPS Receiver with the ability to save your location. A GPS Receiver is a device which allows you to accurately pinpoint your position, by receiving radio signals from GPS satellites. To record tracks and/or waypoints, you will need to select a GPS unit with this function — a specialized unit, but also a smartphone are both good candidates.
Types of GPS receivers
There are many types of GPS receiver, from a simple logger to smartphones with embedded GPS. The most useful for OpenStreetMap listed below.
See GPS Reviews for a list of reviews of GPS devices by OSM contributors.
With hundreds of GPS devices available, providing detailed instruction for all of them is infeasible. The following guide therefore provides generic advise to help you get started. Not all the steps may be necessary (or possible) on your particular device. If you need any help, please ask questions on the mailing lists or IRC.
Once you have recorded a GPS track you can upload it to OpenStreetMap. Some devices (mainly smartphone apps) allow you to directly upload your recorded tracks. For all other devices you will need to copy the file to your computer before uploading via the web interface. Depending on the file format, you may also need to convert the file.
Frequently Asked Questions
Can I use a smartphone?
It depends. Most smartphones do include GPS receivers and you can record track logs using one of the numerous available apps. Unfortunately the accuracy between phones can vary greatly, even between models from the same manufacturer! It can be very difficult to work out the technical accuracy of a GPS track, but a good compromise is to compare your results to other sources. Have a go at recording a track and check that it is smooth (does not jump all over the place) and is roughly in line with GPS tracks recorded by others (preferred), and/or aerial imagery (least preferred due to inaccuracy of aerial imagery in hilly areas).
Note: Recording GPS tracks on a smartphone will result in the battery running out quicker.
See JA:ソフトウェア/モバイル for a list of software for your smartphone; for most platforms there is a table comparing the "Track making features" of the apps.
すべてのカーナビが GPS 軌跡を記録する機能を持っているわけではなく、隠れたサービスメニューに存在することもあります。オンラインで特定の機種番号を検索するか、 mailing lists や IRC で質問するかしてみてください。なお、軌跡を記録する機能があったとしても、バッテリーの持ち時間の都合で実用的ではない場合もあります（一般的には、画面を表示したまま記録していて3時間以内です）。さらに、一部の機器には「道路に合わせる」機能があり、これを無効にできない場合は、マッピング済みの道路から離れたところでしか実用的ではない場合もあります。 これを試してみるには、道路から45度の角度で移動してみたとき、道路に沿って記録され、10数メートル離れたところで突然移動するかどうかで確認することができます。
What to record?
Anything, as long as it reflects a real world feature. For example, try to avoid tracklogs of flights, as these could be distracting or confusing to other map contributors. Don't worry if you don't have the time to edit the map features after uploading a GPS track - the track on its own is helpful for others. Also tracklogs of roads that have already been mapped are also useful, as they can help to validate the true path of a road by providing more sample points.
How accurate is my GPS track?
The accuracy of GPS data can vary greatly between GPS receivers. It is also affected by your surroundings, the weather and the position of GPS satellites at the time of recording the track. For more information see Accuracy of GPS data.
Other means to get data for mapping are described on JA:マッピング技術.