HMMMMM???, Lots of variables in that question. Boat's freeboard, dock height, what part of the boat you are boarding, individual physical ability, etc. The proverbial "picture" of the situation would help. Many types of commercially available "steps" can be purchased or copied if you like to tinker or are skilled in that sort of construction activity. Those steps would divide the step to the deck into several shorter distances. The ramp idea might work in some situations like boarding directly from the stern, but boarding from either side would introduce a heel to the process when someone put their weight onto the ramp. NOTE: all experimentation with ramp access should be done while wearing an appropriate PFD and during warm weather in the event of an unexpected swim.