Worksheet 36 · Skill 5

Set and drift

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1. At 0750 your fix is 173°T, 1.7 nm from Gannet Rock daybeacon. You steer 313°T at 4.1 kn through the water. At 0835 a new fix puts you 238°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 0835 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  

2. At 1230 your fix is 011°T, 2.4 nm from Mill stack. You steer 104°T at 4.7 kn through the water. At 1305 a new fix puts you 048°T, 2.3 nm from Mill stack.

   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  

3. At 0720 your fix is 105°T, 2.2 nm from Gannet Rock daybeacon. You steer 273°T at 7.9 kn through the water. At 0820 a new fix puts you 027°T, 1.5 nm from Heron Point Light.

   Plot the 0820 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 1540 your fix is 214°T, 2.3 nm from Tern Island tower. You steer 293°T at 7.1 kn through the water. At 1615 a new fix puts you 047°T, 2.7 nm from Westfield church spire.

   Plot the 1615 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 1345 your fix is 334°T, 1.9 nm from Mill stack. You steer 356°T at 6.9 kn through the water. At 1420 a new fix puts you 280°T, 3.0 nm from Tern Island tower.

   Plot the 1420 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 0945 your fix is 043°T, 3.2 nm from Heron Point Light. You steer 101°T at 6.5 kn through the water. At 1040 a new fix puts you 019°T, 1.0 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1020 your fix is 069°T, 2.5 nm from Heron Point Light. You steer 330°T at 7.0 kn through the water. At 1055 a new fix puts you 098°T, 2.5 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1320 your fix is 198°T, 2.2 nm from Gannet Rock daybeacon. You steer 284°T at 7.5 kn through the water. At 1355 a new fix puts you 334°T, 2.5 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn