Boarding and Grappling

[Capn Duff]

The thing that surprised me in boarding actions, as I found out to my cost last night was the following, also need a bit of clarification on grappling.

1. The number of crew is totally irrelevant for boardings as you use the burden number, in my case 5 crew on my ship defeated by 2 on the enemy, I drew 5 crew counters he drew one, luck of the draw but the number of crew available is irrelevant.

2. Once grappled the ships stay in situ, no drift or in our case the two ships hit bow on, grappled and stayed nose to nose, I would have thought the ships would have moved abeam to each other, they are grappled after all.

3. If grappled how do you un-grapple? It was not clear to me so I would appreciate clarification here if anyone has an idea or knows.
I think if no boarding takes place you are automatically un-grappled but not sure.

So can anyone enlighten me