3598 or 2599

Kremmen · Posted: Sat Jul 25, 2015 7:40 am Post subject:

Clever

Must see how long it reckons when I'll be travelling to Eastbourne for the day this time next week.

I always like the A22 route but the Nav tries to convince me down the M23
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Satnav:
Garmin 2599 LMT-D (Indoor test rig)
DashCam:
Viofo A119 V3
Car Average MPG :

topref · Posted: Sat Jul 25, 2015 7:56 am Post subject:

Kremmen - That's the route that I get. That road, all the way to the B4309 is a narrow lane. The other Sat Nav brand never took me that way.

Further to this, once on the B4309, at Five Roads, my unit sends me OFF the B4309 on to Heol Hen then Herberdeg Road (both narrow lanes) only to rejoin the B4309 at Pontyates. It saves me .2 of a mile.

I only went Garmin cos of the third party POI issue of the other lot.

Kremmen · Posted: Sat Jul 25, 2015 9:10 am Post subject:

It must think that the narrow lane is quicker than the B road.

I didn't notice but I wonder what the simulation speed was down that lane. That would give the game away and would be something to report if their speed was totally unrealistic for a country lane.
_________________
Satnav:
Garmin 2599 LMT-D (Indoor test rig)
DashCam:
Viofo A119 V3
Car Average MPG :

sussamb · Posted: Sat Jul 25, 2015 9:44 am Post subject:

walkerx · Posted: Sun Jul 26, 2015 3:39 pm Post subject:

the Garmins can have some weird routings - mine used to tell me to turn into a parade in front of a row of shops on the other side of the road to just bypass the pedestrian crossing in front of me.

Other times it has told me at a crossing to take the right-exit, to then turn left (illegally) to go back in front of the crossing to then turn right at the crossing instead of telling me to go straight ahead.

when in scotland it used to take me down country lanes by coming of the dual-carriageway and coming back on further along for no apparent reason

sussamb · Posted: Sun Jul 26, 2015 3:49 pm Post subject:

Your first two are almost certainly map errors rather than issues with the routing algorithm.

The latter one can happen if the routing algorithm sees that is quicker again based on the map data it has. Sometimes if that shortcut is a narrow country lane it won't be. Then again both Garmin and TomTom, and indeed others, would claim the satnav has done it's job and got you to the destination and that there will always be examples where a human brain might have made different decisions Very Happy

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