Worksheet 520 · Skill 5

Set and drift

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1. At 0855 your fix is 212°T, 2.8 nm from Tern Island tower. You steer 182°T at 4.0 kn through the water. At 0925 a new fix puts you 330°T, 2.0 nm from Mill stack.

   Plot the 0925 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 1430 your fix is 034°T, 2.3 nm from Tern Island tower. You steer 106°T at 4.5 kn through the water. At 1505 a new fix puts you 073°T, 3.3 nm from Tern Island tower.

   Plot the 1505 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 0735 your fix is 023°T, 3.0 nm from Heron Point Light. You steer 334°T at 6.1 kn through the water. At 0805 a new fix puts you 056°T, 2.0 nm from Westfield church spire.

   Plot the 0805 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 0900 your fix is 184°T, 0.8 nm from Gannet Rock daybeacon. You steer 280°T at 5.3 kn through the water. At 1000 a new fix puts you 025°T, 2.2 nm from Heron Point Light.

   Plot the 1000 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  

5. At 1400 your fix is 257°T, 2.4 nm from Tern Island tower. You steer 121°T at 5.6 kn through the water. At 1445 a new fix puts you 287°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1445 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  

6. At 1555 your fix is 112°T, 2.2 nm from Westfield church spire. You steer 087°T at 8.7 kn through the water. At 1640 a new fix puts you 134°T, 2.9 nm from Tern Island tower.

   Plot the 1640 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 1020 your fix is 253°T, 1.5 nm from Tern Island tower. You steer 329°T at 4.1 kn through the water. At 1105 a new fix puts you 290°T, 2.0 nm from Tern Island tower.

   Plot the 1105 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 0810 your fix is 040°T, 2.4 nm from Kittle water tank. You steer 259°T at 5.7 kn through the water. At 0905 a new fix puts you 266°T, 2.4 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn