watch out for standard weights
.. and, regardless of standard or actual weights, be careful to adjust the trim divisions as necessary - the divisions give the delta IU for the delta weight nominated against the line which, for standard weights, may be couched in terms of numbers of passengers.
For example, if standard weight is, say, 80kg, then a trim division of, say, 400kg might be specified as 5 passengers rather than 400 kg .. but it's still 400kg regardless of what body weight is used. If the weight of the 5 passengers is, say, 500kg, then you need to trim that load at 1.25 divisions rather than 1 division.
Can be significant if you are using zone loading with a few bodies in the zone.