It's believe it's a matter of individual preference - I always have them removed for boarding, have them rigged for disembarking. I don't think there is a right or wrong way. Couple of other observations though. Both pilots on deck not clipped on to a traveller - first one does hold onto it though. Ascending a pilot ladder with a backpack on - dangerous. And as for the deckhand - don't know why he bothered to go out on deck - no lifejacket, no safety strop made fast to the traveller and no attempt to check the ladder - very casual.
Perfectly safe and used usefully in a heavy swell but not needed under the conditions pictured. The manropes should be taken in; it is dangerous to wear a backpack. Anything to be taken aboard should be hauled up on a heaving line.
When climbing, keeping the body weight over the feet/vertical for use of the strong leg muscles to propel upward. Hands for the stability vs pullups all the way up. The ropes lean you back & out away from the ship. Your body weight is also on the move out/away. If in weather, makes you more vulnerable to wind/sea.
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