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Confused Navman

 
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swiftflo
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PostPosted: Mon Sep 07, 2009 8:40 pm    Post subject: Confused Navman Reply with quote

I recently went on a 400 mile round trip using my Navman F20.
What I would like to know is do other brands work in the same way as my Navman.
Leaving home I set up the post code to where I was going and the Navman calculated the route okay M1 - A14 etc.
Coming home I pressed the button for my home & the Navman again calculated the route, so I set off for home.
I then found part of the way home the Navman was directing me in a different direction to the one I had just been on, A14 - A12 - M25.
Had I done something wrong in the setup or do all Satnavs work like this.
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Darren
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PostPosted: Mon Sep 07, 2009 8:48 pm    Post subject: Reply with quote

It's not unusual for different routes to be calculated for outbound and return legs of a route. Was the return route wildly different?

Many factors affect the calculated route such as one way systems, on/off ramps etc and it may be that there was a shorter route available in one direction that was not available in the other.
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swiftflo
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PostPosted: Tue Sep 08, 2009 1:13 pm    Post subject: Reply with quote

Darren wrote:
It's not unusual for different routes to be calculated for outbound and return legs of a route. Was the return route wildly different?

Many factors affect the calculated route such as one way systems, on/off ramps etc and it may be that there was a shorter route available in one direction that was not available in the other.


Yes the route was very very different, outbound it went M1-A14-A12, return was A14-A12-M25 ( which to me is a no no) A406 - M1, a route which to me was hopeless and was in fact 10 miles further than the outbound route. The Satnav was set up for the shortest route.

Very confusing.
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PaulB2005
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PostPosted: Tue Sep 08, 2009 2:55 pm    Post subject: Reply with quote

It might help to have some idea of where you were travelling from and to. Also which is the outbound direction and which is thr return.
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swiftflo
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PostPosted: Tue Sep 08, 2009 7:54 pm    Post subject: Reply with quote

PaulB2005 wrote:
It might help to have some idea of where you were travelling from and to. Also which is the outbound direction and which is thr return.


I was going to Harwich from Stapleford, Nottm & then returning Harwich to Stapleford. So as I live almost on Junc.25 M1 that seemed the best starting point.
I thought the outward route was great so could not understand why the Navman was sending me back a different way.

Thanks
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swiftflo
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PostPosted: Mon Sep 14, 2009 3:34 pm    Post subject: Reply with quote

Any ideas anyone. Confused
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PaulB2005
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PostPosted: Mon Sep 14, 2009 4:42 pm    Post subject: Reply with quote

Looking at the route in a variety of route planners seems to result in the same sort of thing. Different routes from different planners and different routes in each direction.

I think Darren's post hits it on the head. Just because a route is better one way doesn't mean it's the best (or even possible) in the other direction. After that i would ask Navman as they created the routing engine so perhaps they can tell you why that journey results in the routes it does.
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swiftflo
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PostPosted: Mon Sep 14, 2009 5:09 pm    Post subject: Reply with quote

Thanks
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mikealder
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PostPosted: Mon Sep 14, 2009 5:19 pm    Post subject: Reply with quote

swiftflo wrote:
The Satnav was set up for the shortest route.

This is the answer to your problem, this is the most useless routing mode on any device be it Navman, TomTom, Garmin etc - it shouldn't be used when taking any serious trips without really looking at the route it offers, stick to the fastest or speed limitted or even non motorway but do not use shortest - Mike
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PaulB2005
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PostPosted: Mon Sep 14, 2009 5:33 pm    Post subject: Reply with quote

Quote:
The Satnav was set up for the shortest route.


I could have sworn earlier i saw that, but i couldn't find it just now and so thought i had my threads mixed up....
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swiftflo
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PostPosted: Tue Sep 15, 2009 1:35 pm    Post subject: Reply with quote

Thanks guy's.
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