[mkgmap-dev] Ferry line routing issue

Sun Jun 18 07:04:12 BST 2023

In Basecamp you may have ticked Ferries under Options,Routing, Feature 
type Avoidances .

Also look for {add mkgmap:ferry=1} in your styles.

I've had a similar problem with one of my styles and took out '{add 
mkgmap:ferry=1}'. and as a result it worked.

r

Nick

On 05/06/2023 11:06, Vuki wrote:
> Hi Nick,
>
> that did not help.
>
> Br,
> Mihaly
>
> On 2023. 06. 01. 8:53, osm wrote:
>> Hi
>>
>> Not a real answer but perhaps do a quick check using another routable 
>> type (0x16) for ferries (0x1a or 0x1b) and see what happens.
>>
>> r
>>
>> Nick
>>
>> On 31/05/2023 16:59, 7770 wrote:
>>> Hi.
>>> I can experience the same type of issues (or at least very similar) 
>>> on my
>>> GPSMAP 66st (handheld outdoor unit) when trying to take a ferry from 
>>> the
>>> Scandinavian peninsula to Europe.
>>> I have seen some of the jumps (straight lines occasionally).
>>>
>>> Here is some theory on the issue.
>>>
>>> Examples for such issues are Karlskrona (south of sweden) to Gdynia 
>>> (north of
>>> Poland), or Stockholm to Helsinki. In those cases two the following can
>>> happen.
>>>
>>> When calculating for time, the unit may consider to drive around 
>>> instead of
>>> taking the ferry, the ferry entrance would just be a stop along the 
>>> route but
>>> the device would not consider taking the ferry, because it is 
>>> presumed slower
>>> than driving many 100 kilometers extra or it simply times out saying 
>>> there is
>>> no route possible to calculate.
>>>
>>> If i instead select calculating for shorter distance, the ferry is 
>>> often
>>> considered and used by the route.
>>>
>>> Anyhow, in the style file for lines, there are two entries for ferry 
>>> lines:
>>> 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]
>>>
>>> If the ferry routes are expected to take cars the road_class will be 
>>> 3 and and
>>> the road_speed 0, this road speed is so slow that the device will 
>>> consider to
>>> use a faster way instead of taking the ferry.
>>>
>>> So, what i do to make it a greater chance that a ferry will be used 
>>> when
>>> routing for time, is that i have raised the road_speed to 1 for 
>>> those two
>>> lines, since it would also help for passenger ferries. I was tempted 
>>> to raise
>>> it to 2 but many ferries are too slow for road_speed 2.
>>> This has somewhat improved routing scenarios in my case. It's not 100 %
>>> perfect but much better than before.
>>>
>>> I cant say it is exactly the problem that you see, but some idea.
>>>
>>>
>>> Regards
>>> Karl
>>>
>>>
>>>
>>> On onsdag 31 maj 2023 15:58:00 CEST Vukovics Mihály wrote:
>>>> Hello Community,
>>>>
>>>> I am struggling with an issue. I am generating Garmin map from OSM o5m
>>>> sources(geofabrik) using the built-in style.
>>>> Nor the BaseCamp or my Zümo 396LM is unable to calculate route via 
>>>> ferry
>>>> lines. The behaviour is very strange, here is an example:
>>>>
>>>> Route from Lille to Dover, all avoidances are disabled: unable to
>>>> calculate route, just a straigth line between the citie.
>>>> If I am forcing the route inside the service road area of Calais ferry
>>>> terminal, the route is calculated correctly.
>>>> Even funnier, that when I shape the route directly to the ferry line,
>>>> Basecamp swims me on the ferry instead of routing through the port.
>>>>
>>>> This behaviour is occuring with other ferry lines (for example 
>>>> Aberdeen
>>>> - Lerwick).
>>>>
>>>> I have checked on openstreetmap and the roads are connected and 
>>>> routable
>>>> in the style file.
>>>>
>>>> Here are the example screenshots about the issue.
>>>>
>>>> https://picallow.com/mkgmap-ferry-routing/?usp_success=2&post_id=116783&form 
>>>>
>>>> _id=27
>>>>
>>>> Any ideas or fix?
>>>>
>>>> Br,
>>>> Mihaly
>>>>
>>>> _______________________________________________
>>>> mkgmap-dev mailing list
>>>> mkgmap-dev at lists.mkgmap.org.uk
>>>> https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>>>
>>>
>>>
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