Container ship rolling dangerously

[John Cassels]

Forget the formulae for getting an approximation of your GM , in your head. But consisisted of counting the period of roll in seconds from upright to port or starboard back through the upright and over to port or starboard and back to the upright in seconds or in other words the period of roll. This was divided by a number which forget and gave you an approx. GM. The forgetting bits are something to do with the beam of the vessel. JS.

Think it used to be .44 x beam devided by rolling period in seconds or maybe some unknown boffin in Brussels has come up with a better one ?.

[j.sabourn]

#11 Thanks John some formulas stick in mind for eternity , others have to rack the withering brain. Half convergency sticks half dlong times cos lat to convert radio bearing to mercatorial bearing, and distance of sea horizon equals 1.15 times the square root of the height of eye in feet , and maybe half a dozen more is stuck there , but is now useless information. Cheers JS.

[John Cassels]

#11 Thanks John some formulas stick in mind for eternity , others have to rack the withering brain. Half convergency sticks half dlong times cos lat to convert radio bearing to mercatorial bearing, and distance of sea horizon equals 1.15 times the square root of the height of eye in feet , and maybe half a dozen more is stuck there , but is now useless information. Cheers JS.

No John , not useless . You have something that the modern sailor will never have - a knowledge and experience that you have within you .

[Mike Hutchins]

No John , not useless . You have something that the modern sailor will never have - a knowledge and experience that you have within you .

Not to mention the ability to actually remember stuff.....which usually runs counter to one's age! Excellent!
Mike.