Worksheet 635 · Skill 5

Set and drift

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1. At 0820 your fix is 019°T, 2.6 nm from Mill stack. You steer 055°T at 4.9 kn through the water. At 0915 a new fix puts you 098°T, 2.2 nm from Tern Island tower.

   Plot the 0915 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  

2. At 1255 your fix is 050°T, 4.1 nm from Westfield church spire. You steer 143°T at 6.0 kn through the water. At 1355 a new fix puts you 013°T, 1.3 nm from Mill stack.

   Plot the 1355 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 0925 your fix is 078°T, 3.2 nm from Tern Island tower. You steer 173°T at 4.6 kn through the water. At 1000 a new fix puts you 063°T, 2.1 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1230 your fix is 234°T, 2.1 nm from Tern Island tower. You steer 212°T at 4.9 kn through the water. At 1305 a new fix puts you 053°T, 2.1 nm from Heron Point Light.

   Plot the 1305 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 1150 your fix is 002°T, 2.2 nm from Mill stack. You steer 060°T at 6.7 kn through the water. At 1240 a new fix puts you 033°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1240 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1500 your fix is 192°T, 1.6 nm from Tern Island tower. You steer 290°T at 5.1 kn through the water. At 1620 a new fix puts you 034°T, 1.5 nm from Westfield church spire.

   Plot the 1620 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  

7. At 1245 your fix is 207°T, 3.0 nm from Tern Island tower. You steer 330°T at 5.3 kn through the water. At 1330 a new fix puts you 257°T, 2.4 nm from Tern Island tower.

   Plot the 1330 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 1430 your fix is 054°T, 2.0 nm from Heron Point Light. You steer 088°T at 7.2 kn through the water. At 1525 a new fix puts you 106°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1525 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