How To Choose An Anchor Windlass Anchor windlass mainly installed on the first deck of ship, An anchor windlass can be single gypsy windlass, double gypsy windlass, can be vertical type also horizontal type windlass, if it combined with mooring drum which can be act as a winch for mooring function, the both end can also mounted with warping end.. So how to choose a suitable anchor windlass? Consider that type and structure of you need, then chain diameter and anchor chain weight must be taken into account, also the forecastle beam and the dimensions of the bow bulb also must be taken in to account to ensure smooth handling of twin anchors.