500 feet above deck at 1 Nm gives a 3 degree approach. +_.
However having said that..if VMC that is just a good learning tool ..in olden daze a curving approach was good...leveling off at 1/4 mile but then the "powers that be" decided that into wind at 1 mile constituded a "stabilized approach" even if that put the pad on the other side of the rig because a crosswind approach was now beyond the capabilities of the crews. How we did approaches to runways back at base in a crosswind was a miracle!
I was amazed when I went from bush flying to offshore. It all became so complicated. A FPSO is just a long hill with a confined area at one end. I have had new offshore pilots from the bush look at the FPSO and say .."I will do a crosswind approach with a good overshoot to the left" All commom sense .. Vs others wanting to approach directly into any wind because "you must approach into the wind".