Worksheet 362 · Skill 5

Set and drift

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1. At 1505 your fix is 073°T, 4.5 nm from Tern Island tower. You steer 276°T at 5.4 kn through the water. At 1545 a new fix puts you 003°T, 1.3 nm from Tern Island tower.

   Plot the 1545 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  

2. At 0830 your fix is 017°T, 3.8 nm from Westfield church spire. You steer 146°T at 8.5 kn through the water. At 0930 a new fix puts you 342°T, 2.5 nm from Mill stack.

   Plot the 0930 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  

3. At 0705 your fix is 012°T, 2.3 nm from Mill stack. You steer 079°T at 8.3 kn through the water. At 0745 a new fix puts you 050°T, 2.3 nm from Kittle water tank.

   Plot the 0745 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 1525 your fix is 128°T, 2.0 nm from Westfield church spire. You steer 072°T at 6.8 kn through the water. At 1610 a new fix puts you 210°T, 2.0 nm from Tern Island tower.

   Plot the 1610 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 1050 your fix is 088°T, 3.1 nm from Westfield church spire. You steer 348°T at 5.2 kn through the water. At 1125 a new fix puts you 032°T, 4.2 nm from Westfield church spire.

   Plot the 1125 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  

6. At 1100 your fix is 299°T, 2.3 nm from Tern Island tower. You steer 234°T at 8.0 kn through the water. At 1130 a new fix puts you 097°T, 2.6 nm from Westfield church spire.

   Plot the 1130 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 1305 your fix is 244°T, 3.1 nm from Tern Island tower. You steer 126°T at 6.6 kn through the water. At 1350 a new fix puts you 248°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1350 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 1150 your fix is 010°T, 1.0 nm from Heron Point Light. You steer 077°T at 5.9 kn through the water. At 1235 a new fix puts you 014°T, 2.5 nm from Mill stack.

   Plot the 1235 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