Worksheet 577 · Skill 5

Set and drift

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1. At 0950 your fix is 014°T, 2.4 nm from Mill stack. You steer 309°T at 5.5 kn through the water. At 1035 a new fix puts you 017°T, 2.5 nm from Heron Point Light.

   Plot the 1035 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 1030 your fix is 076°T, 1.0 nm from Heron Point Light. You steer 016°T at 8.5 kn through the water. At 1100 a new fix puts you 279°T, 3.3 nm from Tern Island tower.

   Plot the 1100 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 1100 your fix is 128°T, 1.6 nm from Gannet Rock daybeacon. You steer 351°T at 7.6 kn through the water. At 1130 a new fix puts you 083°T, 3.1 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1010 your fix is 071°T, 1.4 nm from Heron Point Light. You steer 049°T at 7.3 kn through the water. At 1045 a new fix puts you 270°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1045 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 0755 your fix is 025°T, 0.9 nm from Westfield church spire. You steer 096°T at 7.0 kn through the water. At 0835 a new fix puts you 266°T, 2.8 nm from Tern Island tower.

   Plot the 0835 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 0720 your fix is 334°T, 2.3 nm from Mill stack. You steer 091°T at 6.5 kn through the water. At 0800 a new fix puts you 245°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 0800 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  

7. At 1555 your fix is 045°T, 3.1 nm from Heron Point Light. You steer 012°T at 6.2 kn through the water. At 1635 a new fix puts you 320°T, 2.6 nm from Tern Island tower.

   Plot the 1635 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  

8. At 1225 your fix is 248°T, 2.6 nm from Tern Island tower. You steer 136°T at 7.1 kn through the water. At 1310 a new fix puts you 298°T, 1.8 nm from Kittle water tank.

   Plot the 1310 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