In restricted visibility, if a vessel detects by radar alone another vessel forward of her beam and cannot avoid a close-quarters situation, she should (among other Rule 19 actions):
- AAlways alter course to port toward the target if it is forward of the beam
- BAvoid an alteration of course to port for a vessel forward of the beam so far as possible…
- CIncrease to full speed immediately in all cases
- DIgnore radar and wait for visual contact only