In a crossing where you are the stand-on vessel, what should you do?

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In a crossing, the stand-on vessel keeps its course and speed and does not impede the other vessel. This arrangement gives the other vessel (the one that has the stand-on on its port side) the responsibility to avoid collision, by taking early and substantial action if needed. You should stay alert and be prepared to maneuver only if it becomes clear the other vessel will not avoid, but your default is to maintain your current heading and speed.

Changing course to starboard would undermine the stand-on position and could create confusion or a closer approach. Stopping or reversing is unnecessary and potentially dangerous in a crossing. A long blast is not the required response to the collision-risk scenario here; signaling may be used for general awareness, but it does not replace the need to maintain course and speed unless you must avoid.