Tracking streets I have walked

Just having a GPS or cellphone that has a GPS built it on while you walk each road can give you a GPX track. JOSM, and perhaps other OSM editors, can show your personal GPS tracks on a separate layer so you can see where you have walked. Keep your local GPX tracks in a folder and it is easy to open one or many of them after you've started JOSM.

If the GPS app on your smartphone is one setup for gathering data for OSM you can also collect geo-referenced notes and tags if you wish which might make your updating of OSM data easier.

If it helps, here's what I do:

1. Use a handheld GPS to record GPS tracks, and also store waypoints (essentially a numbered marker at a particular location)
2. On a mobile phone, create an email containing notes to go with each numbered marker (for example for a supermarket I might write down the name and other useful information)
3. When I get back, combine the GPX XML with the list of notes that I've emailed to myself
4. Upload the resulting tracks to OSM
5. In $osm-editor-of-choice, use the information in the waypoints to edit the map

Instead of a handheld GPS it'd be perfectly possible to create traces on the phone directly (though battery life might be an issue if you're out all day). In urban areas individual GPS traces may be less useful due to problems with overhanging buildings, but having the device still know where you are is still useful as it enables you (with a Garmin eTrex, and I'm sure with other devices too) to mark nearby places with waypoints and capture more information.

I use this to combine GPX traces with notes - I map a lot of footpaths and also use it to keep track of places that I've seen an unmapped footpath start for later reference. If you just want to combine external information into a GPX file I suspect that there would be easier ways, though.

I use Potlatch 2 as an editor most of the time because historically it has has better out-of-the-box support for waypoints in GPX files than JOSM (though you might be able to do something with MapCSS in JOSM these days).

Hi in addition to stf 's remarks, take a look here to get some hints, http://wiki.openstreetmap.org/wiki/Using_OpenStreetMap I would go for JOSM since it allows you to select (double click) a gpx file with points or a trace (current at Garmin) and gives a suggestion about the area for a download. And yes you’ll have to install JOSM or use Potlach2 or ID (quit friendly for a mobile) instead without a download. Enjoy. PS try to select those roads that are n't on the OSM map or incorrect.