Plotting GPS coordinates on a map

Quick & dirty reply presuming you are using Potlatch 2 as your editor:

1 Connect GPS to PC and open OSM
2 Click on 'GPS Traces' tab
3 Click on 'Upload a trace' link
4 Click 'Choose file' button and locate your file
5 Complete Description and tags then select Visibility you want
6 Click 'Upload' button to upload your file to the server (may take a while to be published - you'll get an email when done)

When done:
7 Click on Edit tab in OSM
8 Click 'GPS data' dropdown button in blue bar at top of map and select My tracks
select your track and job done! :-)

Hope this helps.

You can achieve that easily with the javascript library OpenLayers or using a web service such as ShowYourJourney. For the home-made solution, using OpenLayers, you can find some examples on the wiki. For example, I've also published an example.

Checkout Viking GPS. It's FOSS that runs on Linux and Windows. You can enter GPS Coordinates manually, or read them from a GPS. It can dispay them on top of almost any tile server, including ones that use the OSM data (e.g. Mapnik, Cloudmade). You can also export created map to a file.

I personally user Viking when I am creating maps for road rallies so I can show people where they should have been.

1. Download Maperitive and run it.
2. Drag and drop your GPX file into it.
3. Choose one of the export options from the menu.

you should digg in direction of Mapnik, not openstreetmap