8.5  SEABORNE LANDINGS  Armies at sea may be moved to adjacent land areas by using the normal land movement actions. All ships in the sea area count as part of the attacking force in any battle if you have to fight your way ashore (losses are taken by the attacking armies first, and then the ships). If you capture an area with an attack from the sea but all the attacking armies are lost in the battle, then one attacking ship will be "landed" as an army at not extra cost (unlike the LAND action - see 8.9 - this is not restricted to/Vikings and is not optional). Otherwise the ships don't actually land: even though they fought in a land battle they remain at sea.

8.6  SETTLE  The SETTLE action is allowed only for Gaelic and Viking kingdoms, and is used to exchange one ship at sea for one population in an adjacent land area. The cost is 1 BP. One ship is removed from the sea area and one population is added to the land area. You may not settle in areas that you do not already own, or in areas that already contain population. You may not GROW in areas in which you have settled that turn.
Format [ "SETTLE" ] [ WHERE FROM ] [ WHERE TO ] [ NOT USED ]

8.7  MAINTENANCE & DISPERSAL  Ships are maintained and dispersed under the same rules as armies. Note that since no population is allowed in sea areas, maintenance must always be paid on ships at sea, and one ship in each area is dispersed every turn.  Note: Whenever a ship disperses the same rule applies to any armies carried aboard (which means that if a ship disperses then there will be an army dispersing as well, and there's no risk of anyone getting drowned).

8.8  DROWNINGS  If at any time in a turn the number of armies in a sea area is greater than the number of ships in that a area then the excess armies are drowned.

8.9  LAND  The LAND action is allowed only for Viking kingdoms, and is used to exchange a number of ships at sea for armies in an adjacent land area (which must be one that you already own). The cost is 1 BP. The ships are removed from the sea area and replaced with armies in the land area. The "all" and "all but" formats both work).
Format [ "LAND" ] [ WHERE FROM ] [ WHERE TO ] [ NUMBER OF SHIPS ]