[mkgmap-dev] style and speed of ferries

Mon Mar 29 17:48:10 BST 2021

Hi.
While doing automotive routing on a GPSMAP 66st i found it had very difficult to 
calculate routes taking a ferry if the land masses were connected. This occurs 
over the Baltic sea and over the Mediterranean sea, etc.
Very often, even if the most direct route is to take a ferry, the GPS unit did 
not even try.

I therefor checked the default style and raised the travel speed of ferries 
(both car and passenger) one step in the style. I would like to share it in 
case anyone finds it helpful.

In the lines file.
From:
route=ferry & (motorcar=no | motor_vehicle=no) [0x1b road_class=0 road_speed=0 
resolution 23]
route=ferry [0x1a road_class=3 road_speed=0 resolution 19]

To:
route=ferry & (motorcar=no | motor_vehicle=no) [0x1b road_class=0 road_speed=1 
resolution 23]
route=ferry [0x1a road_class=3 road_speed=1 resolution 19]

This makes it easier for the unit to route along a ferry at least if shortest 
way routing is selected. Shortest time can still make the unit to try to drive 
around very large waters.
I did not want to set the speed higher as road_speed=1 seems to make rather 
okay time calculation for ferry-trips.

Regards
Karl