There you will also find links to the proceedings for the two
I have uploaded my track logs from a few days of geocaching and
sightseeing in Frankfurt am Main. However, these are captured
with the "automatic" sampling interval on my Garmin GPS and thus
it is sometimes hard to follow which GPS points should be
connected. And some of the tracks were captured through the side
windows of buses or trams, with low precision and random jumps
caused by Garmin's misfeature to log initial and erroneous points.