Floating systems for well operations are disclosed with a height-adjustable crown assembly movably connected to a derrick; in one aspect, movable within the derrick by movement apparatus; and, in one aspect, movable with a motion compensator. This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C.F.R. 1.72(b).