Talk:Key:CEMT

Relation to boat=* and its children

From the way the CEMT-tag is used it looks like the presence of any CEMT-value (0 to VII) implies boat=yes (and thus motorboat=yes, canoe=yes, and sailboat=yes) unless these boat classes are explicitly tagged with a negative value. Is this correct? If so I will document this on the relevant pages on the wiki. JeroenHoek (talk) 08:07, 2 August 2020 (UTC)

I do use 'boat' as non-sailing non-motor class. At least in Germany, sailing is prohibited on CEMT-canals, but sailing is allowed on CEMT-rivers. User:Kannix, 2020-08-02

boat=* seems to be the parent class of motorboat=*, canoe=*, and sailboat=*, so boat=yes means sailing is allowed, unless sailboat=no is present. That is, according to the current wiki documentation for these (also access=*).

I wonder what the status quo is. There are a lot of CEMT-tagged waterways that lack any of the waterway access=*-tags. I guess a sensible default by implication (boat=yes for CEMT I and above; motorboat=yes and canoe=yes for CEMT 0) would be good to document; routing engines already seem to do this (OSMAnd I think, but I can't confirm this myself). That way only exceptions need to be tagged. JeroenHoek (talk) 14:02, 2 August 2020 (UTC)

My waterway-routing pages might be of interest: User:Kannix/brouter / User:Kannix/Routino / User:Kannix/international_waterway: Basicly all (my) recreational (sail & motor) boating relies on CEMT only. You should try to discuss this with the whitewater/ canoe users, too ... User:Kannix, 2020-08-02