Worksheet 445 · Skill 5

Set and drift

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1. At 1530 your fix is 332°T, 1.3 nm from Kittle water tank. You steer 265°T at 8.9 kn through the water. At 1600 a new fix puts you 348°T, 1.2 nm from Mill stack.

   Plot the 1600 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 0805 your fix is 049°T, 2.6 nm from Westfield church spire. You steer 126°T at 6.5 kn through the water. At 0840 a new fix puts you 246°T, 2.6 nm from Tern Island tower.

   Plot the 0840 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  

3. At 0925 your fix is 099°T, 2.5 nm from Westfield church spire. You steer 323°T at 6.0 kn through the water. At 0955 a new fix puts you 017°T, 1.5 nm from Westfield church spire.

   Plot the 0955 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 1115 your fix is 017°T, 2.3 nm from Westfield church spire. You steer 119°T at 4.7 kn through the water. At 1245 a new fix puts you 284°T, 1.5 nm from Tern Island tower.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1050 your fix is 248°T, 2.5 nm from Tern Island tower. You steer 183°T at 4.3 kn through the water. At 1145 a new fix puts you 319°T, 1.9 nm from Mill stack.

   Plot the 1145 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 1410 your fix is 254°T, 3.1 nm from Tern Island tower. You steer 097°T at 4.6 kn through the water. At 1440 a new fix puts you 232°T, 1.6 nm from Tern Island tower.

   Plot the 1440 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 1405 your fix is 114°T, 0.9 nm from Gannet Rock daybeacon. You steer 138°T at 4.8 kn through the water. At 1440 a new fix puts you 046°T, 2.2 nm from Kittle water tank.

   Plot the 1440 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  

8. At 1105 your fix is 073°T, 2.1 nm from Heron Point Light. You steer 354°T at 7.8 kn through the water. At 1145 a new fix puts you 275°T, 3.6 nm from Tern Island tower.

   Plot the 1145 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