[mkgmap-dev] Ferry line routing issue

Sun Jun 18 19:47:53 BST 2023

Hi Nick,

none of these. It is related to road_speed, but have not been able to fix. :(

On June 18, 2023 08:04:29 osm <osm at pinns.co.uk> wrote:

> 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.
>>>
>>>
>>> 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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