Changing up a tyre size (without a corresponding change in profile to
keep a constant circumference) is not generally considered a good idea
(especially by insurance companies, vehicle inspection services, etc)!
Jez
On 20/01/2013, Mike Lazzari <watershed@xxxxxxxxxxxxxxx> wrote:
> 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
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