[Tagging] Default maxspeed unit on waterways

Tom Pfeifer t.pfeifer at computer.org
Wed Oct 29 13:52:17 UTC 2014

km/h is derived, at least with an integer multiple of seconds,
from SI units. mph and knots are not. I would prefer to keep
one default unit per tag, consistently, everything else leads
to confusion.

Pieren wrote on 2014-10-29 14:14:
> Hi,
> Currently, le wiki ([1]) suggests that maxspeed has to specify the
> unit "knots" when it's not km/h. But "knot" is the unit used worldwide
> on waterways. Why should we add something obvious on all waterway
> elements ? Could we suggest that the default unit for maxspeed on
> waterways is "knot" and the default "km/h" remains for highways and
> railways ?
> Pieren
> [1] http://wiki.openstreetmap.org/wiki/Key:maxspeed
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