2598 - unreliable fastest routing

inspiredron

I am getting increasingly despondent about the routing abilities of my nuvi 2598. I have just returned from a month in France. I repeatedly found severe routing errors, some understandable but others crazy!
For many years these Garmin satnavs have been prone to take "short cuts" by leaving a main road for a very minor road merely to shorten the route marginally. Although the eta is calculated as earlier it will, in practice, be later because of time lost in making the turns and being unable to maintain speed on the minor road. That sort of error is almost forgiveable.
What is less acceptable is the numerous occasions when common sense tells me to ignore a particular turn and to take a route that is obviously easier and quicker than that dictated by the Gsrmin. Almost invariably the Satnav will try to turn me round and, in the process, add time to the eta. Eventually it will accept the inevitable whrn I ignore its repeated requests for a U turn and then I normally find that the eta can be several minutes ahead of thst estimsted prior to my taking control. Why do the navigation algorithms for Fastest time.not find obvious main routes which are quite clearly the fastest?

Kremmen · Posted: Thu Jul 09, 2015 5:21 am Post subject:

I've always found that on all SatNavs, opting for the shortest route for example does just that regardless of common sense.

My current built in unit, by Alpine, has an option where is displays 5 routes and you select the one that you fancy but even then you need to watch out.

Honda have now ditched Alpine and gone Android Garmin so that will be a new experience if I px next year as I only use my standalone Garmin for the Traffic and cameras.

As you say, you have to ignore some instructions and often not blindly follow what it tells you.
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Satnav:
Garmin 2599 LMT-D (Indoor test rig)
DashCam:
Viofo A119 V3
Car Average MPG :

sussamb · Posted: Thu Jul 09, 2015 8:40 am Post subject:

It's worth looking at the 3 options offered by your nuvi when you do a simple Where to and choosing the one you prefer.

Personally though I tend to use trip planner app and create a route with sufficient via points so that I can avoid any minor deviations that don't make sense.

Having said all that I've used my 2508 a lot in France and rarely had issues. Are you able to remember any of the routes you had issues with?
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Allan_whoops · Frequent Visitor Joined: Feb 18, 2006 Posts: 369

I noticed that my 2598 started doing silly routes even if set to 'fastest' after a map update in about October of last year. For example, to get from Heathfield to the A21 it used to take me down the main road until I got to Hurst Green. After the update, it tries to take one through a whole load of single track roads after Burwash to get to Hurst Green. I wonder if they have put a speed limit of 60 mph on those roads so the system now thinks they are quick.

sussamb · Posted: Thu Jul 09, 2015 10:30 am Post subject:

Anything weird after a map or software update, or both, than you should try a master reset. It resolves more issues after software than map updates but can occasionally help with the latter also.
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Where there's a will ... there's a way.

inspiredron · Posted: Thu Jul 09, 2015 10:47 am Post subject:

sussamb · Posted: Thu Jul 09, 2015 10:53 am Post subject:

A master reset sets the device back to factory settings. What you're doing is what I'd call a cold start, a complete shut down then restart, rather than simply putting the device into standby which leads to a warm start when you tap the on switch. It's certainly true that you need to do a cold start occasionally.

It's difficult to comment on your routing issues without an example. Do you have any?
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sussamb · Posted: Thu Jul 09, 2015 10:55 am Post subject:

Allan_whoops · Frequent Visitor Joined: Feb 18, 2006 Posts: 369

I tried doing a master reset and it made no difference. I don't have traffic trends enabled and it does it on every day of the week and at any time of day.

sussamb · Posted: Thu Jul 09, 2015 11:26 am Post subject:

Weird, what map do you have loaded, is it the latest 2016.10 as that's what I used to check it.
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Where there's a will ... there's a way.

Allan_whoops · Frequent Visitor Joined: Feb 18, 2006 Posts: 369

Yes, its 2016.10 with latest firmware. I think the problem is that it calculates based on the theoretical speed for the road rather than that and the type of road.

sussamb · Posted: Thu Jul 09, 2015 11:48 am Post subject:

If it did I'd be getting the same route as you, but I'm not Confused

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Where there's a will ... there's a way.

Allan_whoops · Frequent Visitor Joined: Feb 18, 2006 Posts: 369

I've just got it out of the car and entered the A21. It has improved BUT it still wants to divert me off the main road just after Etchingham station and down a single track road which then rejoins the main road. You need to look at the map and then zoom in as its not obvious on the larger scale view.

sussamb · Posted: Thu Jul 09, 2015 11:54 am Post subject:

Nope ... still gives me this route when I zoom in

Screen shot taken from Basecamp but nuvi is the same.
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Where there's a will ... there's a way.

inspiredron · Posted: Thu Jul 09, 2015 12:01 pm Post subject:

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