Worksheet 622 · Skill 5

Set and drift

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1. At 0830 your fix is 020°T, 2.0 nm from Mill stack. You steer 331°T at 5.5 kn through the water. At 0925 a new fix puts you 283°T, 3.5 nm from Tern Island tower.

   Plot the 0925 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0945 your fix is 042°T, 3.6 nm from Westfield church spire. You steer 142°T at 4.7 kn through the water. At 1040 a new fix puts you 263°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1040 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0945 your fix is 221°T, 3.1 nm from Tern Island tower. You steer 087°T at 4.2 kn through the water. At 1035 a new fix puts you 045°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1035 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1220 your fix is 084°T, 1.2 nm from Westfield church spire. You steer 149°T at 8.5 kn through the water. At 1250 a new fix puts you 052°T, 1.1 nm from Heron Point Light.

   Plot the 1250 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0835 your fix is 130°T, 2.0 nm from Westfield church spire. You steer 064°T at 6.1 kn through the water. At 0915 a new fix puts you 241°T, 3.1 nm from Tern Island tower.

   Plot the 0915 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1145 your fix is 052°T, 2.9 nm from Heron Point Light. You steer 017°T at 5.4 kn through the water. At 1215 a new fix puts you 278°T, 2.0 nm from Tern Island tower.

   Plot the 1215 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1105 your fix is 004°T, 1.7 nm from Kittle water tank. You steer 277°T at 7.1 kn through the water. At 1200 a new fix puts you 030°T, 3.7 nm from Heron Point Light.

   Plot the 1200 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1110 your fix is 052°T, 3.0 nm from Heron Point Light. You steer 012°T at 4.4 kn through the water. At 1155 a new fix puts you 280°T, 1.2 nm from Tern Island tower.

   Plot the 1155 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn