Tag:waterway=turning_point

waterway = 
Description
A place to turn the driving direction for vessels, where the boats are longer than the river/canal is wide. Show/edit corresponding data item.
Group: waterways
Used on these elements
may be used on nodesshould not be used on waysshould not be used on areasshould not be used on relations (except multipolygon relations)
Useful combination
Status: in use

A place to turn the driving direction for vessels, where the boats are longer than the river/canal is wide.

How to map

Simply add a node node to the waterway at the point where boats can turn and add the tag waterway= to it.

If the turning point has a special name add it with name=*.

Add maxlength=* if there is a known length restriction for turning vessels.

Possible rendering

suggested by User:Chrisana13