Worksheet 315 · Skill 5

Set and drift

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1. At 0725 your fix is 084°T, 1.9 nm from Tern Island tower. You steer 222°T at 6.3 kn through the water. At 0835 a new fix puts you 336°T, 1.7 nm from Mill stack.

   Plot the 0835 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1420 your fix is 047°T, 0.9 nm from Heron Point Light. You steer 017°T at 7.2 kn through the water. At 1515 a new fix puts you 332°T, 2.9 nm from Tern Island tower.

   Plot the 1515 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 0710 your fix is 220°T, 2.8 nm from Tern Island tower. You steer 014°T at 6.8 kn through the water. At 0750 a new fix puts you 311°T, 2.6 nm from Tern Island tower.

   Plot the 0750 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  

4. At 1155 your fix is 050°T, 1.4 nm from Heron Point Light. You steer 342°T at 6.2 kn through the water. At 1250 a new fix puts you 013°T, 3.1 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1300 your fix is 357°T, 3.3 nm from Mill stack. You steer 058°T at 6.5 kn through the water. At 1405 a new fix puts you 030°T, 1.6 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0755 your fix is 358°T, 1.5 nm from Gannet Rock daybeacon. You steer 003°T at 4.6 kn through the water. At 0835 a new fix puts you 056°T, 3.7 nm from Tern Island tower.

   Plot the 0835 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  

7. At 1525 your fix is 062°T, 3.7 nm from Tern Island tower. You steer 261°T at 6.0 kn through the water. At 1635 a new fix puts you 304°T, 4.5 nm from Tern Island tower.

   Plot the 1635 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0940 your fix is 351°T, 3.2 nm from Mill stack. You steer 297°T at 9.0 kn through the water. At 1010 a new fix puts you 121°T, 1.3 nm from Westfield church spire.

   Plot the 1010 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