Worksheet 902 · Skill 5

Set and drift

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1. At 0755 your fix is 200°T, 1.6 nm from Tern Island tower. You steer 160°T at 4.0 kn through the water. At 0825 a new fix puts you 240°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 0825 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 0755 your fix is 044°T, 1.5 nm from Tern Island tower. You steer 141°T at 7.6 kn through the water. At 0830 a new fix puts you 093°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 0830 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 0920 your fix is 037°T, 2.3 nm from Mill stack. You steer 062°T at 4.8 kn through the water. At 1020 a new fix puts you 019°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1020 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  

4. At 0955 your fix is 044°T, 2.4 nm from Gannet Rock daybeacon. You steer 335°T at 6.0 kn through the water. At 1030 a new fix puts you 046°T, 3.7 nm from Tern Island tower.

   Plot the 1030 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  

5. At 1025 your fix is 306°T, 2.8 nm from Tern Island tower. You steer 211°T at 6.4 kn through the water. At 1055 a new fix puts you 096°T, 2.9 nm from Westfield church spire.

   Plot the 1055 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 1010 your fix is 292°T, 3.6 nm from Tern Island tower. You steer 089°T at 7.7 kn through the water. At 1040 a new fix puts you 012°T, 1.9 nm from Tern Island tower.

   Plot the 1040 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 1410 your fix is 112°T, 1.6 nm from Gannet Rock daybeacon. You steer 259°T at 4.3 kn through the water. At 1530 a new fix puts you 006°T, 3.0 nm from Mill stack.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1305 your fix is 068°T, 2.7 nm from Westfield church spire. You steer 137°T at 5.3 kn through the water. At 1335 a new fix puts you 040°T, 2.3 nm from Heron Point Light.

   Plot the 1335 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