Not its not, in the sailing world, of which i know "a fair bit" as an RYA qualified instructor i can guarentee that of the knots taught in the boating world, if you tie up to a quayside and the tide drops and puts it under serious tension the only knot you'll get undone is the round turn and two half hitches.....dont believe me?? Hang a handrover off a cliff and see what knotts you can undo!!!!