[mkgmap-dev] Bad routing on eTrex and MapSource

Fri Jul 10 08:28:36 BST 2020

Hi Ticker,

OK, I've updated Basecamp to 4.7.2 now. When I change the car profile to "shortest way" I also see the long detour, so yes, that makes it more likely that mkgmap writes wrong data. Not sure if I tested this wtih 4.7.1

I'll try to find the trigger for this.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Ticker Berkin <rwb-mkgmap at jagit.co.uk>
Gesendet: Freitag, 10. Juli 2020 09:08
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] Bad routing on eTrex and MapSource

Hi Gerd

There is something very wrong here with the routing here.

Apart from this example, I've never experienced the device taking a
long detour to avoid right turns. Testing with BaseCamp and shortest
distance on MapSource, the route goes the wrong way and makes a u-turn
- see attached BaseCamp trace - do you see this behaviour.

What could be a similar problem I discovered the other day was a
secondary road with a right turn into a alley to a car park. The device
and MapSource wanted to turn into the alley, do a u-turn, then turn
right out of the alley and continue on the road. BaseCamp took a 5 km
detour to avoid going past the alley.

I've also attached my modified test script.

Ticker

On Thu, 2020-07-09 at 15:40 +0000, Gerd Petermann wrote:
> Hi Ticker,
>
> I also don't understand the results in MapSource but I could not find
> anything wrong in the img data. I also didn't see anything wrong in
> the route directions. What value looks suspicious to you?
> My current thinking is that you found an error in the Garmin
> software. I think it overweighs the two right turns (in a drive-on
> -left country)
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag
> von Ticker Berkin <rwb-mkgmap at jagit.co.uk>
> Gesendet: Donnerstag, 9. Juli 2020 17:12
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] Bad routing on eTrex and MapSource
>
> Yes, setting drive on left changes the behaviour back to as described
> at 12:03 (but it don't why)
>
> Ticker
>
>
> On Thu, 2020-07-09 at 14:32 +0000, Gerd Petermann wrote:
> > Hi Ticker,
> >
> > without bounds the program probably doesn't set the drive-on-left
> > flag, so you should set option --drive-on=left to get similar
> > results.
> >
> > Gerd
>
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