Worksheet 671 · Skill 5

Set and drift

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1. At 0720 your fix is 252°T, 2.9 nm from Gannet Rock daybeacon. You steer 319°T at 4.5 kn through the water. At 0825 a new fix puts you 253°T, 1.8 nm from Tern Island tower.

   Plot the 0825 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  

2. At 0935 your fix is 033°T, 3.4 nm from Westfield church spire. You steer 085°T at 4.7 kn through the water. At 1020 a new fix puts you 297°T, 1.8 nm from Tern Island tower.

   Plot the 1020 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  

3. At 1210 your fix is 069°T, 2.1 nm from Heron Point Light. You steer 318°T at 6.8 kn through the water. At 1245 a new fix puts you 051°T, 1.1 nm from Westfield church spire.

   Plot the 1245 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 0755 your fix is 319°T, 2.0 nm from Mill stack. You steer 012°T at 4.4 kn through the water. At 0830 a new fix puts you 061°T, 3.1 nm from Heron Point Light.

   Plot the 0830 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 1305 your fix is 021°T, 2.1 nm from Heron Point Light. You steer 106°T at 5.9 kn through the water. At 1335 a new fix puts you 344°T, 2.1 nm from Mill stack.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1445 your fix is 028°T, 2.5 nm from Mill stack. You steer 350°T at 4.3 kn through the water. At 1555 a new fix puts you 284°T, 4.0 nm from Tern Island tower.

   Plot the 1555 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0915 your fix is 028°T, 3.5 nm from Westfield church spire. You steer 141°T at 8.1 kn through the water. At 0945 a new fix puts you 243°T, 2.3 nm from Tern Island tower.

   Plot the 0945 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  

8. At 0750 your fix is 358°T, 1.2 nm from Kittle water tank. You steer 022°T at 4.8 kn through the water. At 0845 a new fix puts you 085°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 0845 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