Erthenia

Okay, here are the rules in detail.

Ship Movement
Each turn, a ship has 5 movement points.
Cost of vertical movement: 1 point
Cost of horizontal movement: 2 points
Cost of turning: 5 points

Balance
A character on deck has a chance (20% - 1% per point of agility) to fall overboard and die (the "Sailor" skill automatically gives -20%).
A character at the helm (one) has a chance (40% - 1% per point of perception, -10% for the "Sailor" skill) to fail the action.
Characters on the sails (two) have a chance (30% - 1% per point of strength) to fail the action and have a chance (40% - 2% per point of agility, the "Sailor" skill automatically gives -20%) to fall overboard and die.

Map Markers
Green - player ships.
Red - ???
Dark - reefs.
Dark blue - storm clouds
The central thing - a whirlpool. HINT: if a ship gets too close to the center, everyone will die. Hooray!

Generally, sails are lowered during a storm, so I'm not sure about the realism of this, but whatever.

Added 1 minute later
Oh yeah, almost forgot: when performing these actions, sailors 1-6, although they have the "Sailor" skill, do not have the corresponding bonus.