Worksheet 423 · Skill 5

Set and drift

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1. At 1115 your fix is 022°T, 1.7 nm from Westfield church spire. You steer 108°T at 4.6 kn through the water. At 1210 a new fix puts you 084°T, 3.3 nm from Westfield church spire.

   Plot the 1210 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 1445 your fix is 269°T, 2.6 nm from Tern Island tower. You steer 131°T at 5.0 kn through the water. At 1520 a new fix puts you 175°T, 1.6 nm from Tern Island tower.

   Plot the 1520 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 0825 your fix is 072°T, 2.1 nm from Tern Island tower. You steer 286°T at 6.8 kn through the water. At 0900 a new fix puts you 307°T, 3.9 nm from Tern Island tower.

   Plot the 0900 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 0830 your fix is 221°T, 2.1 nm from Tern Island tower. You steer 001°T at 4.3 kn through the water. At 0920 a new fix puts you 319°T, 2.6 nm from Tern Island tower.

   Plot the 0920 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  

5. At 1445 your fix is 085°T, 3.0 nm from Gannet Rock daybeacon. You steer 284°T at 4.3 kn through the water. At 1525 a new fix puts you 098°T, 0.9 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1325 your fix is 056°T, 4.2 nm from Tern Island tower. You steer 266°T at 5.9 kn through the water. At 1455 a new fix puts you 050°T, 3.8 nm from Westfield church spire.

   Plot the 1455 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  

7. At 1420 your fix is 024°T, 1.8 nm from Westfield church spire. You steer 139°T at 4.7 kn through the water. At 1545 a new fix puts you 066°T, 2.8 nm from Heron Point Light.

   Plot the 1545 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1500 your fix is 045°T, 3.0 nm from Heron Point Light. You steer 088°T at 5.6 kn through the water. At 1540 a new fix puts you 184°T, 1.9 nm from Tern Island tower.

   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