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Skippy
Pocket GPS Verifier
Joined: 24/06/2003 00:22:12
Posts: 2946
Location: Escaped to the Antipodies! 36.83°S 174.75°E
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 Posted: Tue Mar 07, 2006 3:44 am Post subject: |
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| gcb wrote: | | I challenge you to get the Garmin unit to calculate just one route to Europe that does not go by Chunnel. |
London to Bordeaux (Shortest route, not Fastest) goes via Le Havre. 
Garmin need to fix their routing algorithm, not all ferries are as slow as they think. 
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gcb
Regular Visitor
Joined: Oct 24, 2005
Posts: 151
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| Posted: Wed Mar 08, 2006 12:41 pm Post subject: |
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Yes, I now realise that if I select the navigation option shortest route, numerous ferry crossings can be chosen, However if I have navigation set to default fastest route the Chunnel is always chosen even when I cant believe it could possibly be faster.
Seems on Shortest route where a long ferry is taken , the Garmin unit is unsure of the arrival time so cant calculate it. If routes like the chunnel are chosen a reasonable guess at the crossing time can be made so an extimated arrival time can be calculated. |
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Milkfloat
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Joined: Jun 15, 2005
Posts: 61
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| Posted: Wed Mar 08, 2006 1:35 pm Post subject: |
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| gcb wrote: | Yes, I now realise that if I select the navigation option shortest route, numerous ferry crossings can be chosen, However if I have navigation set to default fastest route the Chunnel is always chosen even when I cant believe it could possibly be faster.
Seems on Shortest route where a long ferry is taken , the Garmin unit is unsure of the arrival time so cant calculate it. If routes like the chunnel are chosen a reasonable guess at the crossing time can be made so an extimated arrival time can be calculated. |
The unit would have to be pretty clever to know which ferry company you were using and the times of their crossings, so it is not supprising that it cannot tell youy what time you will arive.
FYI my C310 with V8.02 Maps of Europe will try and navigate via Dover - Calais ferry and not the Channel tunnel. This makes sense to me as it is the shortest distance and uses the same class of road. |
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gcb
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Joined: Oct 24, 2005
Posts: 151
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| Posted: Tue Mar 14, 2006 4:24 pm Post subject: |
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| Quote: | The unit would have to be pretty clever to know which ferry company you were using and the times of their crossings, so it is not supprising that it cannot tell youy what time you will arive.
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Actually looking at review route , I now see I can always see the total distance and the arival time. Seems the Garmin does something along the lines of what otherss suggested. Assumes all ferrys are 12mph of something similar.
Now for an insite into how Garmin do thier routing.
Try this on a C310 C320 or C330. Probaly possible too on an I3 if you can type in the place. Vagur, with accent on a.
The UK maps include all the UK, Ireland and a little of France, what you may not also realise, they include 2 to 3 miles of the southern tip of the southern most of the Faeroe Isles. In which area the small village port Vagur is mapped. I imagine this place probably only has one or 2 unpaved roads which are unmapped by Garmin.
Now you can scroll through the map on a C310 and find the place , up up up to edge of map. Select it and try navigate.
The route calculated on my C310 has an 700 mile detour up to scotland and back down the exact same roads? Curiously uses M6 toll one way and not the other. It seems that Garmin navigation tries to find a route from A to B and B to A at same time and calculates when the 2 paths meet.
OK this isnt a route anyone would ever use thier Garmin for but it highlights a problem in the navigation algorithm. Drive 400 miles to scotland and more, make u turn drive another 400 back to within 2 miles of where you started then go off back down to Dover? |
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c3sgt
Occasional Visitor
Joined: Jan 29, 2006
Posts: 8
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| Posted: Sat Mar 18, 2006 11:50 pm Post subject: |
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Hi Thought I'd just add my pennys worth.
Earlier this week, I plotted on my streetpilot C310, a route from my home in Wiltshire to Cardiff Wales, fastest route.
I logically assumed it would direct me to the M4, not likely! I ignored the protests from the sat nav and headed for it anyway and was subjected to directions to come off the motorway at every junction en-route, which I continued to ignore. Interestingly every ignored instruction to leave the motorway reduced my arrival time at re-calculation until eventually I made my destination 30 minutes sooner than the ETA at the beginning of my journey!!
How the hell can this be right when I asked for the fastest journey before I left my driveway?
There has to be some software problem surely.
I'm beginning to realise that the system is really best suited to finding the last part of the journey to destination rather than what happens in the middle which, I have to say is a little dissapointing. |
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ride4smilesjonny
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Joined: Dec 29, 2005
Posts: 222
Location: teesside
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| Posted: Sun Mar 19, 2006 12:21 am Post subject: |
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just double check in your settings that you aren't on 'avoid highways' - please comment..
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Skippy
Pocket GPS Verifier
Joined: 24/06/2003 00:22:12
Posts: 2946
Location: Escaped to the Antipodies! 36.83°S 174.75°E
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| Posted: Sun Mar 19, 2006 10:50 pm Post subject: |
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| ride4smilesjonny wrote: | | just double check in your settings that you aren't on 'avoid highways' |
Yeah, I think ride4smilesjonny has it right, when it says Highways, it means motorways.
Make sure you have avoid toll roads switched off too (although it will still use the toll road if the detour is excessive)
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c3sgt
Occasional Visitor
Joined: Jan 29, 2006
Posts: 8
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| Posted: Mon Mar 20, 2006 12:58 am Post subject: |
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I checked all the settings before I started my journey and again before the return journey, after what I experienced. The C310 behaved exactly the same on the return route!!
I see some of you are saying that Garmin are updating the mapping to V8 for free, is this correct? I see nothing on their website to this effect and I haven't been e-mailed by them even though I'm registered for updates! |
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Robin2
Lifetime Member
Joined: Nov 24, 2003
Posts: 1441
Location: Swansea
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| Posted: Mon Mar 20, 2006 2:47 am Post subject: |
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c3sgt - I don't know where in Wilts you live, but I just planned a route from High St, Calne, Wilts to my son's address in Cardiff. It headed straight for the M4 and did not leave it until Cardiff
Robin
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mhb
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Joined: Dec 21, 2005
Posts: 155
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| Posted: Mon Mar 20, 2006 9:03 am Post subject: |
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Slowly but surely the evidence builds.
I'm now more than ever convinced that there is a navigation problem with the i3. |
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c3sgt
Occasional Visitor
Joined: Jan 29, 2006
Posts: 8
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| Posted: Mon Mar 20, 2006 10:15 am Post subject: |
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| I live in Calne also! what more can I say? |
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Robin2
Lifetime Member
Joined: Nov 24, 2003
Posts: 1441
Location: Swansea
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| Posted: Mon Mar 20, 2006 11:46 am Post subject: |
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Then it looks as though yours is avoiding motorways, even though you had not ticked the Avoid Highways box
Robin
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TomTom One v3 Europe, Navcore 7.903, Western Europe 835.2420
TomTom Go 720 Europe, Navcore 8.351, Western Europe 855.2884
Satmap Active 10
Plus a lot of other PDA GPS kit, seldom used |
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Skippy
Pocket GPS Verifier
Joined: 24/06/2003 00:22:12
Posts: 2946
Location: Escaped to the Antipodies! 36.83°S 174.75°E
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| Posted: Mon Mar 20, 2006 12:46 pm Post subject: |
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| c3sgt wrote: | | I checked all the settings before I started my journey and again before the return journey, after what I experienced. The C310 behaved exactly the same on the return route!! |
So which way does it try to route you if it doesn't take the M4?
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zogman
Frequent Visitor
Joined: Sep 05, 2005
Posts: 1417
Location: swindon uk
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| Posted: Mon Mar 20, 2006 1:04 pm Post subject: |
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| Skippy wrote: |
So which way does it try to route you if it doesn't take the M4? |
i reckon down the a4 via bath and bristol....the a4 being a 'fast' road...
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c3sgt
Occasional Visitor
Joined: Jan 29, 2006
Posts: 8
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| Posted: Mon Mar 20, 2006 8:27 pm Post subject: |
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I've plotted a route again today from Swindon to Frimley. I was in no hurry on the outward route so I followed the shortest option. On the return journey I thought I would try the shortest first and see the time scale and then with the fastest, when I did, lo and behold they both took exactly the same time to the minute and the route looked identical, again avoiding the M4 motorway!! My conclusion is that my C310 cannot plot the fastest route period.
I recently, couple of weeks ago, downloaded the newest software from Garmin, which came with no guarantees, now I can see why!! It was alright prior to this. |
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