[mkgmap-dev] bearing/heading influence on routing

Tue Oct 22 09:27:24 BST 2013

Hi Programmers,

first see 
http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2012q1/014145.html

I see two different interpretations:
1) mkgmap encodes the initial heading (A-B) and the final heading (C-D), always using one byte "curve data "
for the final heading.
2) display tool displays the initial heading as "direction", and one or two bytes curve data

My theory is that the two byte curve data is used when we have a road 
where initial heading AND final heading are (very) different from the direction (A-D).
Question is: what value is stored in the different fields?

Does anybody already know more details? 
If not, what is the best way to find out?
I could either try to write a program that displays the data in real maps, or I could simply
use try and error in the mkgmap write routine to find out how MapSource reacts one
different codings. I played a little bit with the latter and I see differences in the calculated
times. 

Gerd

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