Worksheet 589 · Skill 5

Set and drift

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1. At 1455 your fix is 328°T, 1.7 nm from Heron Point Light. You steer 030°T at 4.9 kn through the water. At 1555 a new fix puts you 301°T, 2.5 nm from Tern Island tower.

   Plot the 1555 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1500 your fix is 060°T, 2.8 nm from Gannet Rock daybeacon. You steer 240°T at 4.3 kn through the water. At 1530 a new fix puts you 358°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1530 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  

3. At 1315 your fix is 007°T, 3.6 nm from Westfield church spire. You steer 142°T at 4.8 kn through the water. At 1405 a new fix puts you 270°T, 3.5 nm from Tern Island tower.

   Plot the 1405 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 0910 your fix is 029°T, 4.0 nm from Westfield church spire. You steer 152°T at 4.1 kn through the water. At 1015 a new fix puts you 062°T, 1.9 nm from Westfield church spire.

   Plot the 1015 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1335 your fix is 199°T, 1.4 nm from Tern Island tower. You steer 076°T at 7.6 kn through the water. At 1405 a new fix puts you 050°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1405 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  

6. At 0830 your fix is 357°T, 2.2 nm from Tern Island tower. You steer 104°T at 4.3 kn through the water. At 0915 a new fix puts you 021°T, 2.5 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1100 your fix is 331°T, 1.5 nm from Heron Point Light. You steer 089°T at 5.1 kn through the water. At 1150 a new fix puts you 024°T, 1.9 nm from Mill stack.

   Plot the 1150 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 0835 your fix is 240°T, 3.2 nm from Tern Island tower. You steer 205°T at 5.2 kn through the water. At 0905 a new fix puts you 034°T, 1.5 nm from Heron Point Light.

   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