Vertical windlasses are suitable for large anchor lockers with more of the windlass unit being hidden below deck. The anchor rode makes a 180° wrap around the gypsy providing more security. A minimum fall of 406mm (18") is recommended in order to have enough gravity to pull the rode down into the locker.
Horizontal windlasses are easy to install with most of the windlass unit being found on deck. It is good for boats with small anchor lockers. The anchor rode enters the gypsy, makes a 90° turn and feeds into the anchor locker. A minimum fall of 304mm (12")is recommended in order to have enough gravity to pull the rode down into the locker.