First couple mins cut off, gps finding signal. But anyhow, this is how annoying mine is. Also gives a good idea of how hard I flog the bike.
If you wanna do one of these, all you need is a GPS that records a GPX. Personally I had my android phone record with a program called "My Tracks" its free but the only issue is its for cyclists and it seems to cut out stops, so everywhere you the graph dip all the way down, I probably came to a complete stop or close to it . Uploaded it to the site http://utrack.crempa.net/ which turns the GPX into purty graphs and maps.