For operators who are unfamiliar with this type of software ...
Why do you need GLM?
If you ever load your vessel in a way that is not directly represented
in your stability documentation, you will not know for sure that
you are operating within safe limits unless you work out the weight,
center of gravity and free surface numbers and know how to check those
numbers against a curve of maximum allowable CG (or minimum GM) at that
displacement and LCG. It takes some time to do this properly and there
is always the question of whether it has been done correctly. GLM does
it for you very quickly and never makes errors in arithmetic.
Although large vessels almost always employ GLM or similar software today,
smaller vessels can benefit from stability checks as well. If there is
a trim and stability book aboard, GLM will assist you in making use of
the information therein.
Creative Systems, Inc.