Worksheet 397 · Skill 5

Set and drift

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1. At 0740 your fix is 350°T, 1.1 nm from Kittle water tank. You steer 307°T at 6.7 kn through the water. At 0810 a new fix puts you 200°T, 2.6 nm from Tern Island tower.

   Plot the 0810 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  

2. At 1200 your fix is 077°T, 2.4 nm from Heron Point Light. You steer 314°T at 7.9 kn through the water. At 1245 a new fix puts you 001°T, 1.7 nm from Westfield church spire.

   Plot the 1245 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  

3. At 1245 your fix is 307°T, 3.1 nm from Tern Island tower. You steer 268°T at 4.3 kn through the water. At 1335 a new fix puts you 007°T, 2.5 nm from Westfield church spire.

   Plot the 1335 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 1255 your fix is 066°T, 3.0 nm from Heron Point Light. You steer 101°T at 5.7 kn through the water. At 1325 a new fix puts you 055°T, 2.5 nm from Mill stack.

   Plot the 1325 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 0900 your fix is 141°T, 1.8 nm from Westfield church spire. You steer 013°T at 7.2 kn through the water. At 0935 a new fix puts you 032°T, 3.1 nm from Westfield church spire.

   Plot the 0935 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1105 your fix is 342°T, 2.7 nm from Mill stack. You steer 088°T at 4.8 kn through the water. At 1155 a new fix puts you 210°T, 2.0 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1535 your fix is 219°T, 3.0 nm from Tern Island tower. You steer 325°T at 6.2 kn through the water. At 1625 a new fix puts you 300°T, 4.1 nm from Tern Island tower.

   Plot the 1625 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  

8. At 1155 your fix is 079°T, 2.4 nm from Heron Point Light. You steer 357°T at 5.3 kn through the water. At 1225 a new fix puts you 053°T, 3.4 nm from Heron Point Light.

   Plot the 1225 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