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I acquire my own GPS traces using a Garmin GPS Map 76Csx. When I remember, I upload these to OpenStreetMap. Otherwise, I just open the GPX files directly in JOSM. The advantage of Garmin devices is of course that you can then create maps from OpenStreetMap data for the GPS unit itself.
When I want to see all the traces (both mine and those that other people have uploaded) in the OpenStreetMap database, I download the GPX tracks using JOSM (or if I’m using Potlatch 2, there’s an option to display the GPS data).