"Sailing" - ?

I have found a huge number of ships that set their AIS to "Sailing" instead of the default of "Underway using Engines".

I would suggest that the setting of "Sailing" should be changed to something like "Under Sail" to avoid the confusion that seems to exist. Ships that I have pointed this error out to seem suprised that they are in error saying that they are sailing when underway but I am sure that this is not what is meant by the setting "Sailing".