I believe that a GPS lays down a bread crumb trail. Any spurious bits
can throw off the track. Usually one can edit the logging feature to
best record the track for the current use, e.g. points per distance or
points per time interval. On one recent hike my GPS recorded a total
distance of almost 8½mi when I knew the distance was actually 7¼mi.
Quite a discrepancy. Upon viewing the track I could see that the unit
was still tracking during rest stops and lunch and also some bad
readings under tree cover. During lunch I had readings all over within a
35ft radius of the rock we were sitting on. The record setting was set
to "auto" rather than "distance". After I edited out the extra readings
the track showed 7¼mi! The problem with a distance setting is that
switchbacks are not correctly tracked. Don't see a solution other than
what I did after the fact at home. And I will try to remember to pause
tracking while stooped. This was a great learning experience with a new
unit on a beautiful day with no weather issues. The backtrack would have
been much more important had there been a chance of a turn in weather.
The same is probably true in an automobile especially in an urban canyon
in traffic.
BTW I used my GPS to note a 2-3% under reading of my speedometer after I
changed up a tire size. That explained the apparent reduction in gas
mileage.
Mike
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|