Helm

the Chair

A spelljammer helm (often just helm) is a magical seat that powered the Spelljammer ship it is attached to. It does this by converting the magical energy of the spellcaster sitting in it into motion, both steering and propulsion.

Game Note: The nature of the Anon (magic) in Alanspace causes a Spelljammer to lose most of its power inside the Alan's crystal sphere, only being functional in Aldern's atmosphere. While the 'pilot' retains the ability to steer, all propulsion abilities of the Helm no longer function. A special 'Solar Sail' is needed on ships to move it through Alanspace.