Worksheet 789 · Skill 5

Set and drift

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1. At 1150 your fix is 005°T, 1.9 nm from Westfield church spire. You steer 090°T at 7.6 kn through the water. At 1235 a new fix puts you 263°T, 1.4 nm from Tern Island tower.

   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  

2. At 1500 your fix is 285°T, 2.1 nm from Tern Island tower. You steer 269°T at 4.1 kn through the water. At 1540 a new fix puts you 024°T, 2.7 nm from Westfield church spire.

   Plot the 1540 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  

3. At 0755 your fix is 003°T, 2.5 nm from Mill stack. You steer 047°T at 8.5 kn through the water. At 0825 a new fix puts you 023°T, 1.5 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  

4. At 1050 your fix is 059°T, 3.2 nm from Heron Point Light. You steer 054°T at 4.1 kn through the water. At 1130 a new fix puts you 316°T, 1.1 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1235 your fix is 069°T, 1.7 nm from Heron Point Light. You steer 060°T at 5.5 kn through the water. At 1405 a new fix puts you 041°T, 3.7 nm from Gannet Rock daybeacon.

   Plot the 1405 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1600 your fix is 296°T, 3.3 nm from Tern Island tower. You steer 174°T at 4.4 kn through the water. At 1655 a new fix puts you 257°T, 3.7 nm from Tern Island tower.

   Plot the 1655 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 1335 your fix is 064°T, 2.1 nm from Heron Point Light. You steer 354°T at 5.7 kn through the water. At 1430 a new fix puts you 295°T, 3.3 nm from Tern Island tower.

   Plot the 1430 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  

8. At 1340 your fix is 013°T, 0.9 nm from Heron Point Light. You steer 087°T at 4.8 kn through the water. At 1415 a new fix puts you 056°T, 3.0 nm from Heron Point Light.

   Plot the 1415 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