Comparisons

I have a Garmin Nuvi 200W as my first satnav. I have been very pleased with
it.

Last week I acquired a TomTom One and decided to give it a try for the sake
of making a comparison. I was surprised that the TomTom wanted me to stay on
the defined route - even when I arrived at my destination after straying -
it was telling me to turn around. Is this normal with TomTom - or is it just
a feature of that model.

I prefer the way the Garmin recalculates within seconds if you make an
alternative turn.

I guess my real question is "Do the different makers employ a widely
different logic?"

x-posted to TT - since it was a related TomTom question -

I know when we went to a dinner,
a friend who has a TomTom - not sure which model -
took a slightly different route than I did with my Garmin.

Some differences can be due to device settings.... short, fast, avoid, etc -
Then there is just the weird things that happen every so often.

I tend to think the GPS logic is driven by straight line & stair step street
access,
and balanced with the speed limit of the streets involved.

In our case - haven't really timed it out for real, or via Google maps -
the Garmin GPS has us coming down I-335 and goes PAST our normal exit,
to get off at the next exit and work our way back...
Guessing the 50mph roads PAST our house are faster than the 35/40mph exit
roads.

ie - get from A to B in shortest/fastest path

ps56k wrote:

Very often, of course, the same unit will calculate a different route when
returning from a location, than the route it took getting you *to* the
location!

Kev

On Tue, 2 Mar 2010 22:27:08 -0000, Ret. wrote:

Sometimes that can be explained by turn weighting. An on-side turn
getting a different preference than off-side turns... Or it thinking
that going three-quarters of the way around a big roundabout is enough
distance difference to need a different route.

--
100. Finally, to keep my subjects permanently locked in a mindless
trance, I will provide each of them with free unlimited Internet
access.
        --Peter Anspach's list of things to do as an Evil Overlord

Peter H. Coffin schreef:
1. a calculated time of 30 seconds more makes that route not the fastest....
2. traffic lights are not an item in the calculation