It should be said however FF that most microlights are fitted with big, chunky, easy to read compasses - usually the Silva yacht types. Most GA compasses are only used for updating the DI, and therefore are only designed to be read whilst flying straight and level in reasonably unbumpy conditions.
I find it much easier generally to navigate by compass alone in a microlight than in a GA type such as a PA28 with a u/s DI.
P