Worksheet 203 · Skill 5

Set and drift

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1. At 1305 your fix is 200°T, 2.2 nm from Gannet Rock daybeacon. You steer 262°T at 6.1 kn through the water. At 1335 a new fix puts you 009°T, 1.5 nm from Mill stack.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1330 your fix is 090°T, 1.2 nm from Heron Point Light. You steer 357°T at 7.3 kn through the water. At 1410 a new fix puts you 284°T, 3.9 nm from Tern Island tower.

   Plot the 1410 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  

3. At 0835 your fix is 300°T, 1.6 nm from Gannet Rock daybeacon. You steer 211°T at 5.8 kn through the water. At 0905 a new fix puts you 019°T, 2.7 nm from Mill stack.

   Plot the 0905 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  

4. At 0805 your fix is 326°T, 1.9 nm from Mill stack. You steer 354°T at 4.4 kn through the water. At 0850 a new fix puts you 260°T, 2.2 nm from Tern Island tower.

   Plot the 0850 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  

5. At 1205 your fix is 012°T, 1.9 nm from Mill stack. You steer 330°T at 8.1 kn through the water. At 1300 a new fix puts you 049°T, 3.5 nm from Westfield church spire.

   Plot the 1300 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  

6. At 0825 your fix is 124°T, 1.1 nm from Westfield church spire. You steer 007°T at 4.2 kn through the water. At 0915 a new fix puts you 019°T, 2.6 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1235 your fix is 358°T, 2.3 nm from Tern Island tower. You steer 112°T at 5.6 kn through the water. At 1320 a new fix puts you 065°T, 3.6 nm from Tern Island tower.

   Plot the 1320 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  

8. At 1535 your fix is 197°T, 2.2 nm from Tern Island tower. You steer 295°T at 7.4 kn through the water. At 1625 a new fix puts you 022°T, 2.9 nm from Westfield church spire.

   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