2 recent "faults" with my i3?

MaFt · Posted: Tue Feb 21, 2006 6:13 pm Post subject:

i'm sorry mhb but how is that example inconsistent? you had different destinations each time... obviously you'll get different routes with different destinations Rolling Eyes

MaFt

mhb · Regular Visitor Joined: Dec 21, 2005 Posts: 155

The point is that the M6 services were on the route between home and Dundee given at Christmas and so if the unit had been consistent it surely ought to have taken me to this same service station by the appropriate part of same route not an entirely different one.

Lester_Burnham · Frequent Visitor Joined: Oct 17, 2005 Posts: 618

ride4smilesjonny · Posted: Tue Feb 21, 2006 8:33 pm Post subject:

Lester_Burnham · Frequent Visitor Joined: Oct 17, 2005 Posts: 618

MaFt · Posted: Tue Feb 21, 2006 11:56 pm Post subject:

guys, let's stop this getting personal and get back to the point of the topic ;)

MaFt

ride4smilesjonny · Posted: Wed Feb 22, 2006 12:33 am Post subject:

My sincere apologies to all, it was meant as harmless fun, my apologies Lester Embarassed

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mhb · Regular Visitor Joined: Dec 21, 2005 Posts: 155

On further reflection I suspect that Lester's suggestion (also referred to by Ash10 earlier in this thread) that not knowing the complete algorithm by which a route is calculated is the root cause of this apparent problem.

I say this because in my own quoted instance of apparent inconsistency it occurs to me that I was taken over the Forth Bridge and around Edinburgh ring road at a time of comparatively low traffic density whereas on the journey up such a route would have coincided with a time of high traffic density. After all the Edinburgh route was marginally better so maybe anticipated traffic and time of day is taken into account. Who knows!

bumpkin · Posted: Wed Feb 22, 2006 12:39 pm Post subject:

jimbo_hippo · Frequent Visitor Joined: May 18, 2005 Posts: 444

Crikey! Check out the handbags swinging in the Garmin Forum! Great entertainment!

If you started on your drive every day and navigated to the same favourite and it gave you a different route from time to time then I would consider that an inconsistency. If you introduce extra variables like waypoints, etc then that will probably affect the route. Was the alternative route considerably longer than that of the first one? i.e. an hour longer?

I find that with various GPS proggies, a startpoint as little as 1mile on a straight road can make a difference. I think unless we get to see what the coder who wrote the program does with the data from the maps at time of route calculation we'll never know but I can confirm that other proggies do the same. Currently using Destinator PN and got stuck yesterday. Due to boredom I tried tapping the screen and selecting recalculate. Did it a few times over about 3miles and got a couple of different routes.

I'm no expert so all is guess work but perhaps the system does a quick 'sweep' of the area for major roads within a certain distance then extends it and so on. If that was the case then a movement of a few hundred yards could put that first hop to a major road out of reach and lead to a recalculation. pure guessology.

But I'm sure this isn't unique to Garmin and Tom Tom Nav 5 sometimes gives a different return route.

As for the naving on roads you know, I do it. But I don't get upset if I know a better route. Its just maths inside the unit. I live in a rural area and there are some fast B-roads which all programs ignore. If you know them then yippee. But I don't get upset that my GPS hasn't driven down them while I'm asleep and checked them.
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Orange M3100, Orange SPV M5000
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ride4smilesjonny · Posted: Fri Feb 24, 2006 3:33 pm Post subject:

ride4smilesjonny · Posted: Fri Feb 24, 2006 3:37 pm Post subject:

Aitch2 · Posted: Fri Feb 24, 2006 4:03 pm Post subject:

It's a filthy lie, I tell you - the pixies said to tell you that they're not your friends any more and will likely take you via Penzance next time... 8O Twisted Evil

Aitch
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ride4smilesjonny · Posted: Fri Feb 24, 2006 4:14 pm Post subject:

...to the little blighters!!!! Hang on though... i live in penzance!!.. Aww Bless em, my little friends! Jumping With Joy

_________________
**********************************
Hi ho - Hi ho its off to Arran i go,
with my i3 and a cup of tea hi ho, hi ho
hi ho hi ho.....
**********************************
www.ride4smiles.co.uk

£3500 raised in two weeks! :-)

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