Alex, it remains self-evident that a compass is an essential fitting on a sea kayak if one is to be considered a mariner--charts and a compass.
Which of course means the Polynesians, Irish (Brendan the Navigator) and Vikings weren't mariners. ???
You do carry a sextant I hope? Or own one?
What I'm saying is tools for the job/area. If one is competent at using the sun as a compass and a topo map for assessing the coast, then those are the tools to use. It also depends how many times one has been in the area as well.