Worksheet 209 · Skill 5

Set and drift

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1. At 1420 your fix is 352°T, 2.5 nm from Mill stack. You steer 308°T at 5.7 kn through the water. At 1510 a new fix puts you 150°T, 1.4 nm from Westfield church spire.

   Plot the 1510 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 1445 your fix is 004°T, 2.3 nm from Heron Point Light. You steer 146°T at 4.8 kn through the water. At 1520 a new fix puts you 096°T, 2.1 nm from Heron Point Light.

   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 0835 your fix is 003°T, 1.5 nm from Heron Point Light. You steer 042°T at 4.4 kn through the water. At 0905 a new fix puts you 015°T, 2.6 nm from Heron Point Light.

   Plot the 0905 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 0850 your fix is 264°T, 2.2 nm from Tern Island tower. You steer 153°T at 6.8 kn through the water. At 0930 a new fix puts you 218°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 0930 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 1325 your fix is 204°T, 1.9 nm from Tern Island tower. You steer 272°T at 4.9 kn through the water. At 1430 a new fix puts you 081°T, 1.3 nm from Westfield church spire.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1440 your fix is 239°T, 3.3 nm from Tern Island tower. You steer 295°T at 8.6 kn through the water. At 1510 a new fix puts you 033°T, 2.0 nm from Westfield church spire.

   Plot the 1510 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  

7. At 1035 your fix is 059°T, 1.6 nm from Kittle water tank. You steer 281°T at 6.6 kn through the water. At 1150 a new fix puts you 263°T, 3.2 nm from Tern Island tower.

   Plot the 1150 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0715 your fix is 036°T, 3.5 nm from Heron Point Light. You steer 151°T at 6.8 kn through the water. At 0745 a new fix puts you 015°T, 1.5 nm from Mill stack.

   Plot the 0745 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