For what it's worth, I collated the 'commandments' listed above I felt were important. Bit of double up perhaps but then again each says something slightly differently to others. Yeah, alright, more than 10 - but, if it's important, leave it in I feel. Wording not perfect - some inconsistency - only made minor adjustments to what others listed above. Refine further as you wish!
Preparation & Maintenance
Thou shalt honour thy impeller and sails
Thou shalt be aware at all times of thy own boats condition.
Thou shalt be more attentive to function than pretty.
If you fix it yourself you will be the master of your fate.
Any strange sound or vibration will haunt you until you find the source.
Thou shalt not be wholly dependent upon electronics
Thou shalt know how to bleed thine own diesel
, and how to heave thine own vessel to.
Thou shall respect the Law of Gross Tonnage.
Thou shalt not over-burden thy vessel, with unneeded provisions, spares, or books
Thou shalt not leave on a passage
without having shaken thee and thy crew and thy vessel down beforehand.
Weather / Observe / Monitor
Respect the weather.
Thou shalt watch the weather even when asleep.
Thou shalt let the weather, not the calendar, determine when thee departeth.
Thou shalt not make commitments to be at a destination
at a specific time.
Thou shalt keep a diligent watch.
Thou shalt gaze round the entire horizon at least every 12 minutes.
Sailing Care / Safety
Depart early,- anchor
Thou shalt not move across questionable flats on the high tide.
Thou shalt not sail through uncharted reefs
at night or in poor visibility.
Thou shall not enter an unfamiliar harbour at night.
Thou shalt reef early.
Thou shalt reef when nightfall or the black cloud approacheth, not wait till it arriveth.
If there's any doubt, determine a new plan.
Thou shalt not hit the other boat ever no matter what.
Thou shalt use rig preventers and jacklines
Thou shalt not be overly indulgent with the rum underway.
Thou shalt not attempt to pee, upchuck, or spit off the weather side.
Thou shalt not heel while cooking thy supper.
Thou shalt not have more than one boat (in the path of a hurricane
Thou shalt not anchor
too close to thy neighbour.
Thou shalt deploy a little extra rode
Leadership / Respect
Thou shalt do it the Captain's Way.
Let not there be more than one Captain
Thou shalt follow thy skipper's instructions for the care of the head
-- or be the one to muck it out and rebuild
Thou shalt honour thy senior sailors.
Thou shalt respect thy crew and their needs, or thou shall single-hand.
Thou shalt not abuse the crew and other sailors.
Thou shalt not abuse the hailing or other radio
Thou shalt conserve fresh water
Thou shalt not spoil it for those who sail behind thee.
Thou shalt leave a clean wake.
Thou shalt not stop learning all thou can.
Thou shalt not allow the halyards to clang on thy mast
in an anchorage.
Thou shalt spend more time sailing than doing maintenance