Operating - Plot A Ship's Course

The seas of Alwaus are vast and dangerous; perhaps the only thing left in this world that the Alvain truly fear. Those that do brave the open waters of Alwaus do so in order to seize adventure and opportunity despite the dangers at hand. Navigating the seas of Alwaus is no easy task however, as a ship can do days without ever seeing an island or shoreline with which to mark their position. There are reports and stories every other week of merchant and military ships that set sail and never return - either lost on the waters of Alwaus or pulled underneath it's surface by storm or assailant. Travelling the seas requires complex calculations that only a skilled navigator can make, ensuring that the safety and well fair of the ship's navigator key to reaching one's destation as intended.
The difficulty in plotting a ship's course is relative to the distance between the ship's distance and it's destination.
EXAMPLE OF A PROGRAM A NAVIGATION COMPUTER CHECK
Hotham’s ship just got out of a fight with a group of pirates. He wants to head back to a friendly port to repair his ship. His destination is a port in a nearby shore so the GM sets the difficulty at Average (d d ).
Since his ship’s Hull Trauma is currently above half its threshold, Hothom’s player adds a b to the dice pool. The roll generates s h h h .The GM uses a h
to have the ship go off course, in an adjacent region and the remaining h to inflict strain on the ship. Hothom realizes they are off course but spots a nearby island. He does not know much about it though. He will have to decide whether to risk setting sail again or to settle for this island to make the repairs.