For these to work you must be standing on a boat.
Raise Anchor – Raises the anchor, required before setting off on your journey
Drop Anchor / Lower Anchor – Drops the anchor, required before you dry-dock the boat
Forward / Unfurl Sail – Move the boat forward
Stop / Furl Sail – Stop the boat from moving
Turn Left / Port – Turn the boat left
Turn Right / Starboard – Turn the boat right
Turn Around / Come About – Turn the boat around
Back / Backward / Backwards – Move the boat backwards
Right / Drift Right – Move the boat right
Left / Drift Left – Move the boat right
Forward Right / Forward Left / Back Right / Back Left – Move the boat in the specified direction
Slow (Direction) – Move the boat slowly in the specified direction
(Direction) One – Move the boat one tile in the specified direction then stops
Start – After plotting a course on a map or sea chart and handing it to the Tillerman, say this and he will move the boat along that course
Goto (Number) – After plotting a course on a map or sea chart and handing it to the Tillerman, say this and he will move the boat to the specified Nav Point number, then continue along the course
Single (Number) – Same as above, but the Tillerman will not continue the course after reaching the desired Nav Point
Nav – The Tillerman will tell you what Nav Point you are heading to
Continue – If the boat is Stopped while on a course, this will resume following it