Garmin Nuvi routing rules

gwynnej3 · Occasional Visitor Joined: Nov 05, 2006 Posts: 5

Does anyone know what rules Nuvi 310 applies when working out a route?

Mine is great for 'last-mile' navigation to town destinations, but with Fastest route set it still tries to send me on wacky detours through villages and towns even when there are obvious major (and direct) routes available. Changing vehicle type from car to bus to truck doesn't seem to improve matters - or indeed produce any obvious change to the route.

What are the rules for Taxi and Emergency vehicle types?

The Nuvi is a lovely little device and the Pocket GPS speed camera databases work pretty well though the beeping is a bit over-enthusiastic at times, but on a longish run it is no substitute for a road atlas and some common sense.

Thanks.

swing · Posted: Wed Nov 15, 2006 9:00 am Post subject:

What have you set in the "Avoid" options? These can vary the routes taken more than the general settings. Certainly having Avoid Highways (aka Motorways) set would cause the problems you describe.

As for beeping too much - in what way is it beeping too much - if you have loaded a speed camera database, it will beep as you approach each camera, and is likely to beep if you are speeding past the camera, otherwise it's unlikely to beep at all! If it's beeping whilst you are under the speed limit, there's a chance you loaded the database wrong.

gwynnej3 · Occasional Visitor Joined: Nov 05, 2006 Posts: 5

Hi Swing

Avoidances I have set are Traffic, U-Turns and Unpaved Roads, nothing else. reasonable? I get the wacky routes even when there's no traffic incidents showing, but I'll try with the TMC unplugged to see if it's anything to do with that.

The speed camera warnings I get regardless of my speed so maybe I have done something wrong. I did wonder if it considered my speed when deciding to warn me. I did a manual install using POI loader, setting the trigger distance to 1320 feet (quarter of a mile). It was done late at night so maybe I'll take another look at that one. Actually that's one feature I find quite impressive, so it was just an observation not a criticism.

Cheers.

Skippy · Posted: Wed Nov 15, 2006 12:55 pm Post subject: Re: Garmin Nuvi routing rules

gwynnej3 · Occasional Visitor Joined: Nov 05, 2006 Posts: 5

Navigate from Warwick to Milton Keynes MK5 6LB. M40 to J11 Banbury. Obvious route then is A422 Brackley then (perhaps less obvious) A43 to A421 south of Brackley and then A421 to Buckingham direct to the west side of MK.

Nuvi wants to take B4525 from M40 J11 through villages towards north of Brackley then fiddle its way through lanes to A422 and on into the middle of Buckingham which is a nightmare route. And not for trucks!

Reverse the above route and Nuvi takes you to Buckingham then wants to make a right turn into the town rather than cruising round the by-pass.

Heading north to Hull last week from Warwick all was fine until I got on the M1 from M69, it then wanted me to exit to the A46 towards Newark, which OK is the shorter route, but definitely not the fastest. Ignoring directions to turn off at Leicester she told ne to exit for the next three exits of M1 until eventually she gave up and agreed M1 is the way to go.

Skippy · Posted: Wed Nov 15, 2006 3:18 pm Post subject:

gwynnej3 · Occasional Visitor Joined: Nov 05, 2006 Posts: 5

I see. Thanks. TomTom would suffer the same issue?

Back to my original question - what is the difference between Car/Motobike, Bus, Truck, Taxi, Emergency - anyone know?

Cheers again.

swing · Posted: Wed Nov 15, 2006 5:30 pm Post subject:

The different vehicles will have different ETAs based on different speed information on the different road types.

The different vehicles alter certain navigation options - roads that are buses only will be available to buses, emergency vehicles can (I think) go through no entry signs, and obviously people walking can go the wrong way down one way roads. Trucks (I think) - it will try to avoid too tight turns.

So, the different vehicles have slightly different navigation and different ETAs.

Skippy · Posted: Wed Nov 15, 2006 8:25 pm Post subject:

perussell · Frequent Visitor Joined: May 12, 2006 Posts: 292

I had a similar problem with my new Nuvi last week when navigating down from Wrexham to N Wiltshire in that it sent me down the A5 to Shrewsbury and thence across country to Bridgenorth and Kidderminster before joining the M5 just N of Worcester. I know from experience that carrying on the M54 to the M6 and thence onto the M5 is faster - even allowing for a degree of congestion around the M6/5 interchange. I tried the proposed route and it was slower but I have noticed that if you "know better" and plough on regardless the Nuvi will much more readily recalculate a new route rather than keep trying to redirect you to the original route than some other systems I know of.

cantgetlost · Frequent Visitor Joined: Nov 14, 2005 Posts: 291

Satnav is just a machine, when we visit daughter in Leeds the nuvi, i3 and other sat nave will take us out of the city to the motorway just to get up the road to Bradford.
70mph on the m'way makes it the fastest route but does not take into account the traffic from the city out to the motorway, at the wrong time of day you can nearly be in Bradford in the time it takes to get to the M'way slip road.
I use fasted route to the outskirts of cities or towns and then switch to shortest route.
Always check your route on Via Michelin or a map especially if you have a deadline to meet.

mrgthomas · Occasional Visitor Joined: Nov 09, 2006 Posts: 23

pandamedic · Occasional Visitor Joined: Oct 25, 2004 Posts: 50

Skippy · Posted: Fri Nov 17, 2006 3:50 pm Post subject:

Mearns · Posted: Fri Nov 17, 2006 7:37 pm Post subject:

Since he is a Police Officer he probably knows....... Laughing

_________________
Tony
nuvi 2460LT plus Brodit mount

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