A interesting discussion took place the other day at the “GPX discussion group”:http://tech.groups.yahoo.com/group/gpsxml/message/1804

It was about the trkseg tag in a GPX feed, which is used to split a track up in segments. The problem is that track segments are not supported by all GPX exporters, including the popular open source project “GPSbabel”:http://www.gpsbabel.org/. GPSbabel and some other exporters parse every track segment into a new track, which can result in literally hundreds of new disjoint tracks! This is intensional by GPSbabel. I’m happy to read that many posters in the group agree with me on that track segments are a reasonable construct in the GPS schema and they should be supported by GPX exporters.

The GPX parser and exporter behind TopoShare.org supports track segments.

Here is GPS for your mountain bike.  It clips on your handlebars and gives you all the features of a sport GPS while you ride.  The units include measurement for speed, cadence, heart-rate, altitude.  It looks like you can buy it from REI or Amazon when its available.
Via Garmin Blog

Its always a good idea to pack paper maps before going on an outdoor adventure and now TopoShare.org enables users to create high resolution paper maps with routes from the site. Click the Acrobat icon below the route map and the PDF generator screen appears. Here you can drag the map to the right position and change the scale and paper orientation. You can then select a base map. The base map is requested from the web service in high resolution and it can take a while to get (about 5-6 mb of data). When ready hit ‘Make pdf’ and shortly after the pdf is ready for download.

I’ve experienced that the browser return a blank page after clicking ‘Make PDF’. Just try to hit the reload button on your browser. I’ll try to fix this bug.