My Tom Tom one V2 GB doesn't find the fastest route

JoshT

Does anybody else have the same problem with the TT one V2 GB version not finding the quickest route ?

With the preference set to fastest I put in my destination - I've found in some instances that if I block off certain roads on the proposed route I can find a quicker route (in distance and journey time) Sad

What's worse the information can be 300 - 500% out. On driving home from a meeting I had to take a detour due to congestion on the proposed route. I reached the A4 and the TT wanted me to turn left estimated journey 29 minutes and 7.9 miles. I turned right and the TT immediately recalculated 9 minutes and 2 miles Sad

I've contacted TT but all support can tell me this is due to the routing algorithym (Really - I'd have never have guessed:!: )
and I have the option to reprogramme the unit if I don't like the TT's routing. As far as I'm concerned not while I'm driving Evil or Very Mad

This issue makes the TT useless as far as I'm concerned - If I knew the way always I wouldnt need a Sat Nav.

Anybody else experienced similar problems Question

Tumbleweed · Frequent Visitor Joined: Aug 30, 2004 Posts: 315

trog100 · Regular Visitor Joined: Sep 15, 2006 Posts: 195

neither would u with a five year out of date map.. or at least sometimes u wouldnt.. i think it just goes for the "use the motorways" approach if possible.. it cant be that clever.. its only a computer after all..

trog

mlhindley · Occasional Visitor Joined: Jun 03, 2006 Posts: 5

JoshT · Posted: Fri Sep 29, 2006 12:07 am Post subject:

Tumbleweed: To answer your question

Try start point: Taplow Station near Maidenhead (Bucks)

Finish: Maidenhead, Berks: junction Oldfield road, Bray Road and Forlease road.

FYI - I've taken the unit back. I'm waiting to see if the European version is any better. This is a show stopper for me on the regional version. Also the POI are all over the place. I guess they put them on using post codes ; for the petrol stations I've looked at some are on the wrong side of the street, wrong road or even worse routed to a Cul de sac in a housing estate will no access the the petrol station forecourt Exclamation

trog100 · Regular Visitor Joined: Sep 15, 2006 Posts: 195

u only have to look at the new intel cpu and compare it to the earlier P4 to know that raw processor speed alone dosnt count for much..

i assume that a tomtom 400 mhz is better than a 200 one but i should know better.. he he

trog

uptowndisco · Regular Visitor Joined: Jan 06, 2005 Posts: 79

Here is the route I got on my TT1 New Edition using your route instructions.

Click the Pics to enlarge.

Tumbleweed · Frequent Visitor Joined: Aug 30, 2004 Posts: 315

shauneco · Posted: Fri Sep 29, 2006 9:48 am Post subject:

If navigating with "Fastest Route" doesn't give you the expected result's use the "Shortest Route". Remember it's only a computer and doesn't alway's get things right. Maybe TomTom will improve the route calculation in the next Firmware update as they have done with V6.51 Firmware for the x10 serie's.

JoshT · Posted: Fri Sep 29, 2006 10:05 am Post subject:

Thanks for checking.

Well thats the correct route! I guess the TT was trying to stay with the original route from Milton Keynes M1-M25-M4.

Another instance of not finding the fastest route is:

Start: Junction Bray Road/Chiltern road Maidenhead
Finish: POI, Ferry Terminal, Poole passenger ferry.

TT takes you to M3 at J 3 ? journey 2 hours 9 minutes

by blocking off roads you can get a quicker route by getting on the M4 at J8/9 then down the A33 .... This saves about 4 minutes and 4 miles. Not so bad but another instance of the device not being able to find the quickest route.

iancjc · Posted: Fri Sep 29, 2006 1:12 pm Post subject:

The problem with sat nav and users views of it is that it has to calculate the fastest route in the shortest time which may not be the best route..

Saving 4 minutes on a 2 hour Journey is a difference of only 3% - well within most applications of this types "tolerable error".

If it took say 4 minutes to calculate the route (by looking at every road combination possible) rather than say 30 seconds it's likely that there would be tons of posts about calculation times (4 years ago on these forums there were loads of posts about navigator taking minutes and minutes to calculate certain routes. Also if it took a long time to sort the route the saving on the journey would vanish.

The thing about sat nav is that it will get you to a destination without you having to ask directions but local knowledge will always be better - thats why London cabbies take the "knowledge".

The next firmware may well tweak the routing as it has done on different versions in the past.
_________________
-----------------------------------------------------------
TyTn II (WM6.1) / tomtom one v2
TTN6.03 tomtom 7.xx (one)

JoshT · Posted: Sat Sep 30, 2006 5:01 pm Post subject:

As far as I'm concerned the unit has a major flaw - thats what computers are designed to do. i'm not so worried about the extra 4 minutes on a 2 hour journey. It's the problem I encountered coming back Milton Keynes ending up at taplow station due to hold ups only to find it wants to route me a much longer route back home. I'd be really hacked off if it did it to me when I was travelling in any area I didn't know.

Lack of TMC is also an issue on the TT1 now, my phones not compatible Crying or Very sad

Was going to consider the TT one v2 European but think I'll wait for the Nuvi 660 released

Tumbleweed · Frequent Visitor Joined: Aug 30, 2004 Posts: 315

mikealder · Posted: Sat Sep 30, 2006 8:51 pm Post subject:

One point to consider, and this applys to ALL sat nav systems, IF your local knowledge is better than the device's chosen route simply ignore the nav unit and go your own way, the same applys if the device tells you to go through deep water, across a field etc - simply ignore it and continue -

For either of these senarios the nav unit will re-compute a new route and still take you to your destination, to be honest saving a projected 2 or 3 mins over a couple of hours journey is not relevent.

The reality is traffic jams/ accidents etc, if you chose an "Avoid part of route" because of traffic then it can add distance and time to the trip, but its still quicker than sitting stationary for hours going nowhere, give the device a chance to reroute in advance to miss the hold ups - its called Traffic, but it costs, and you would need to re-consider the phone - Mike

m3crj · Occasional Visitor Joined: Apr 28, 2006 Posts: 1

don't forget ppl computers don't do compramise make sure ya settings are all set ok in ya menu u can set it to avoid motor ways and A roads sat nav units are here to assist u to get some where and human interface is always need i.e drive asmuch of the way as u can from you own knowledge and let the tt recalculate for the bits ya don't know not had no probs with my tt1 v2 updated the firmware otherday more phone compatibility and gets me from a to b without all the shouting and screeming for directions (that's usually me)

	PocketGPS
	Web