Worksheet 572 · Skill 5

Set and drift

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1. At 1245 your fix is 032°T, 2.1 nm from Heron Point Light. You steer 090°T at 4.6 kn through the water. At 1335 a new fix puts you 214°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1335 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  

2. At 1130 your fix is 346°T, 2.3 nm from Mill stack. You steer 283°T at 4.6 kn through the water. At 1225 a new fix puts you 037°T, 2.0 nm from Heron Point Light.

   Plot the 1225 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  

3. At 0700 your fix is 015°T, 2.3 nm from Heron Point Light. You steer 059°T at 4.3 kn through the water. At 0730 a new fix puts you 242°T, 2.2 nm from Tern Island tower.

   Plot the 0730 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 1325 your fix is 069°T, 3.3 nm from Westfield church spire. You steer 121°T at 4.1 kn through the water. At 1420 a new fix puts you 219°T, 2.9 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0920 your fix is 084°T, 1.9 nm from Gannet Rock daybeacon. You steer 328°T at 4.7 kn through the water. At 1000 a new fix puts you 034°T, 3.4 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1440 your fix is 331°T, 2.4 nm from Tern Island tower. You steer 104°T at 4.5 kn through the water. At 1535 a new fix puts you 070°T, 3.6 nm from Tern Island tower.

   Plot the 1535 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 1250 your fix is 075°T, 1.9 nm from Westfield church spire. You steer 041°T at 6.2 kn through the water. At 1325 a new fix puts you 293°T, 4.1 nm from Tern Island tower.

   Plot the 1325 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 1135 your fix is 248°T, 2.0 nm from Gannet Rock daybeacon. You steer 298°T at 7.2 kn through the water. At 1205 a new fix puts you 088°T, 3.4 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn