1 NICHOLLS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE pass ahead of me (Article 23), or, alter course to port. (2) Alter course to starboard for C (Article l&JU (3) Stand on for D. In Ship B—(1) Keep clear of C. 02) Stand on for D (3) Stand on for A. B Fig. 3. In Ship 0—(1) Keep clear of D. (2) Alter course to starboard for A (3) Stand on for B. IB Ship D—(1) Keep clear of A. (2) Keep clear of B. (3) Stand on for 0