[mkgmap-dev] [PATCH v1] adjust turn headings more

Sat Jan 23 10:42:40 GMT 2010

Mark Burton wrote:
> This patch modifies the turn heading adjustment code so that the GPS
> will tell you to turn when you are routing from a main road to a side
> road in situations like this:
> 
> 
>                S
>                S  ^
>                S  |
>   MMMMMMMMMMMMMM  |
>                M  |
>                M  |
>                M
>                M
> 
> You can see that the main road goes around a left corner and the side
> road carries straight on. Without this patch, neither mapsource or a
> Nuvi will tell you to turn right at this junction even if the side road
> has a different road class/speed from the main road.
> 
> This patch also allows you to globally enable/disable the possible
> adjustments by providing a bitmask with the --adjust-turn-headings
> option. By default, all (currently, there are 2) kinds of adjustments
> are enabled. See the help blurb for more info.
> 
> A value of 1 gives the old behaviour.
> 
> Mark
> 
> 
Cool.  I'd noticed that my GPS wasn't coping with this situation 
properly before.  Are there any further turn behaviours that still need 
to be coded for?

Charlie