When two vessels are in crossing situation on the water the vessel that must take early an substantial action to avoid a collision vessel A is called what?

In a crossing situation on the water, the vessel that must take early and substantial action to avoid a collision is called the "give-way vessel." The other vessel, which has the right of way and is not required to take evasive action, is known as the "stand-on vessel." The give-way vessel must navigate in such a way as to avoid a collision with the stand-on vessel.