Its important to check out the object hardness settings and the ground labels of a target. PDF on main site.
http://www.squadselectseries.comFor example;
boats are boats(BB) in the OT setting = 1000 pts
freighters are cargo(CM) in the OT setting = 2500 pts
destroyers are capital(C1) in the OT setting = 3500 pts
250kg GP bomb does 1289 pts of damage so it takes 1 direct hit to sink a boat, 2 DHs to sink a freighter and 3 to sink a destroyer.
trucks are carriers(CB) in the OT setting = 200 pts
tanks are weapons(WM) in the OT setting = 850 pts
metal bridge spans are docks(DM) in the OT setting = 2250 pts
stone bridge spans are rocks(RK) in the OT setting = 500 pts
pontoon bridge spans are pontoons(EH) in the OT setting = 350 pts
100kg GP bomb does 516 pts of damage so it takes 1 DH to destroy a truck, pontoon or stone bridge span, 2 DHs to destroy a tank and 5 DHs to destroy a metal bridge span.