The seating arrangement at the chart table is quite bad. I am too tall for adding cleats or a foot rest, my knee is already twisted funny. And there is no back support, either. In rough seas, it is impossible for me to stay seated and work there. And dangerous as I would get through side to side and end up on the floor.
What worked best was sitting sideways. I stuffed cushions against the side of the quarter berth and leaned against that. My feet were against the galley sink. This provided at very secure seating arrangement where I didn't move, and it made reading and working much easier. Unfortunately, I was twisted sideways to look at something on the chart table. After a while that made my neck hurt. I want to do something, but not sure yet. I think the best arrangement would be to rebuild the thing, with a seat that pulls out of the side, so you are sitting more on the centerline of that boat. A real seat, that moves less because it is on centerline, with more foot room. But a major redesign of the area.