Bom dia António, pelo menos em PTBR o termo "trim" é traduzido por compasso.

O compasso é o ângulo da embarcação em relação à superfície do mar. Normalmente é zero graus.

trim (trm)
v. trimmed, trim·ming, trims
v.tr.
1. To make neat or tidy by clipping, smoothing, or pruning: trimmed his moustache.
2.
a. To remove (excess) by cutting: trim a budget.
b. To remove the excess from by or as if by cutting: trimmed off the rotten wood.
3. To ornament; decorate.
4. Informal
a. To thrash; beat.
b. To defeat soundly.
c. To cheat.
d. To rebuke; scold.
5. Nautical
a. To adjust (the sails and yards) so that they receive the wind properly.
b. To balance (a ship) by shifting its cargo or contents.
6. To balance (an aircraft) in flight by regulating the control surfaces and tabs.
7. To furnish or equip.
v.intr.
1. Nautical
a. To be in or retain equilibrium.
b. To make sails and yards ready for sailing.
2.
a. To affect or maintain cautious neutrality.
b. To fashion one's views for momentary popularity or advantage.

Veja o significado náutico acima. Espero ter ajudado