1) horizontal sextant angle
2) vertical sextant angle ( by using the dist off formula)
3) 3 bearing method
4) monitoring the depth counter and transit brg
%uF0DC If the ship takes up an angle of loll due to a very small %u2013ve GM, it should be corrected as soon as possible.
%uF0DC First make sure that the heel is due to a %u2013ve GM and not due to uneven distribution of weights on board
Eg: When bunkers are burned from one side of a divided DB tank, it will obviously cause G to move to G1, away from the COG of the burned bunkers and will result in the ship listing.
%uF0DC Having satisfied that the weights are uniformly distributed, one can assume that the list is probably created due to small negative GM
%uF0DC Top up any slack tanks and lower the weights within the ship if possible to eliminate the virtual rise of G due to FSE.
Eg: Derricks to be lowered if any topped
Oil in deep tanks to be transferred to DB tanks
%uF0DC If the ship is still listed and if it is decided to fill DB tanks, start by filling the lower side of the tank which is adequately subdivided. It is safe to use tanks those which have the smallest area and filled so that the increase in list is reduced to a minimum.
%uF0DC Tanks to be filled one at a time.
%uF0DC The list is bound to increase at the initial stages.
%uF0DC If the high side is filled first, the ship will start to right herself but then it may roll suddenly over to take up a larger angle of roll on the other side or perhaps even capsizing.
%uF0DC When more water is run into the tank the COG of the ship will gradually move down and the list will start to decrease.
%uF0DC As the list decreases, water may run into the other side of the tank
%uF0DC Never start by filling tanks on the higher side first
