Worksheet 628 · Skill 5

Set and drift

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1. At 1025 your fix is 050°T, 2.4 nm from Tern Island tower. You steer 152°T at 6.9 kn through the water. At 1055 a new fix puts you 064°T, 2.3 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1600 your fix is 069°T, 2.5 nm from Tern Island tower. You steer 130°T at 6.4 kn through the water. At 1630 a new fix puts you 049°T, 3.5 nm from Gannet Rock daybeacon.

   Plot the 1630 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  

3. At 0900 your fix is 332°T, 1.3 nm from Gannet Rock daybeacon. You steer 268°T at 5.0 kn through the water. At 0950 a new fix puts you 055°T, 2.9 nm from Heron Point Light.

   Plot the 0950 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  

4. At 1030 your fix is 295°T, 2.9 nm from Tern Island tower. You steer 281°T at 6.2 kn through the water. At 1105 a new fix puts you 035°T, 2.4 nm from Westfield church spire.

   Plot the 1105 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 1600 your fix is 026°T, 3.0 nm from Heron Point Light. You steer 087°T at 4.2 kn through the water. At 1720 a new fix puts you 320°T, 1.6 nm from Kittle water tank.

   Plot the 1720 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1330 your fix is 011°T, 2.7 nm from Mill stack. You steer 309°T at 6.0 kn through the water. At 1420 a new fix puts you 248°T, 3.6 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1205 your fix is 257°T, 1.5 nm from Tern Island tower. You steer 195°T at 4.3 kn through the water. At 1305 a new fix puts you 071°T, 2.8 nm from Heron Point Light.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0825 your fix is 048°T, 3.1 nm from Tern Island tower. You steer 265°T at 5.7 kn through the water. At 0900 a new fix puts you 316°T, 2.4 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