[mkgmap-dev] Bad routing on eTrex and MapSource

Sat Jul 11 12:20:40 BST 2020

Wow - that is a simplification. I was initially confused because both
BaseCamp and Mapsource show the old, full map, despite it having been
renamed, but show the routes between the 9 nodes in your minimal test
map.

Ticker

On Fri, 2020-07-10 at 11:13 +0000, Gerd Petermann wrote:
> Hi Ticker,
> 
> it seems to be related to the encoding of the heading / bearing data.
> I've reduced the test case to a few roads (see attached file) which
> still show the problem.
> When I rotate this small set of data a little bit the problem
> disappears.
> 
> Will continue later...
> 
> Gerd
> 
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag
> von Gerd Petermann <gpetermann_muenchen at hotmail.com>
> Gesendet: Freitag, 10. Juli 2020 09:28
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] Bad routing on eTrex and MapSource
> 
> 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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