Conan the Pirate page 104, the spear get a bonus if used from a zone in one boat to another zone in a second boat. Is it possible to make a melee attack from one zone to another?
spears can be thrown
Yes you can move from medium to close range with a minor move action and attack in one standard action.
Spears and pikes don’t have the “thrown” quality. And the page clearly mean melee combat as “in reach”.
That entire list is a special set of rules for a special set of circumstances. ie Ship to Ship actions.
So in this situation, yes it is possible.
Generally it is not.