Worksheet 41 · Skill 5

Set and drift

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1. At 0835 your fix is 283°T, 2.1 nm from Tern Island tower. You steer 290°T at 6.0 kn through the water. At 0905 a new fix puts you 029°T, 4.1 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1305 your fix is 108°T, 1.8 nm from Tern Island tower. You steer 160°T at 4.3 kn through the water. At 1340 a new fix puts you 096°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1340 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 1315 your fix is 050°T, 1.2 nm from Heron Point Light. You steer 345°T at 4.8 kn through the water. At 1410 a new fix puts you 075°T, 2.8 nm from Westfield church spire.

   Plot the 1410 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  

4. At 0935 your fix is 054°T, 2.4 nm from Gannet Rock daybeacon. You steer 009°T at 5.1 kn through the water. At 1005 a new fix puts you 037°T, 3.6 nm from Gannet Rock daybeacon.

   Plot the 1005 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  

5. At 1425 your fix is 081°T, 1.9 nm from Westfield church spire. You steer 144°T at 7.0 kn through the water. At 1500 a new fix puts you 311°T, 1.8 nm from Mill stack.

   Plot the 1500 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 1540 your fix is 063°T, 2.1 nm from Heron Point Light. You steer 085°T at 5.1 kn through the water. At 1625 a new fix puts you 035°T, 2.4 nm from Mill stack.

   Plot the 1625 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 1130 your fix is 068°T, 2.2 nm from Gannet Rock daybeacon. You steer 338°T at 4.1 kn through the water. At 1205 a new fix puts you 039°T, 3.6 nm from Gannet Rock daybeacon.

   Plot the 1205 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  

8. At 1030 your fix is 035°T, 3.2 nm from Gannet Rock daybeacon. You steer 226°T at 5.9 kn through the water. At 1140 a new fix puts you 257°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1140 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