Worksheet 469 · Skill 5

Set and drift

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1. At 1420 your fix is 027°T, 2.5 nm from Kittle water tank. You steer 262°T at 7.2 kn through the water. At 1455 a new fix puts you 055°T, 2.4 nm from Mill stack.

   Plot the 1455 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  

2. At 0850 your fix is 249°T, 3.1 nm from Tern Island tower. You steer 228°T at 6.1 kn through the water. At 0920 a new fix puts you 002°T, 1.8 nm from Heron Point Light.

   Plot the 0920 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 1505 your fix is 192°T, 2.0 nm from Gannet Rock daybeacon. You steer 041°T at 4.2 kn through the water. At 1545 a new fix puts you 074°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1545 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  

4. At 0830 your fix is 003°T, 2.3 nm from Tern Island tower. You steer 271°T at 7.1 kn through the water. At 0915 a new fix puts you 019°T, 2.9 nm from Westfield church spire.

   Plot the 0915 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  

5. At 0910 your fix is 024°T, 2.4 nm from Mill stack. You steer 339°T at 4.2 kn through the water. At 1030 a new fix puts you 282°T, 3.9 nm from Tern Island tower.

   Plot the 1030 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 1225 your fix is 322°T, 2.1 nm from Tern Island tower. You steer 232°T at 6.9 kn through the water. At 1300 a new fix puts you 013°T, 2.3 nm from Heron Point Light.

   Plot the 1300 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  

7. At 1145 your fix is 272°T, 2.1 nm from Tern Island tower. You steer 263°T at 6.0 kn through the water. At 1230 a new fix puts you 093°T, 2.5 nm from Westfield church spire.

   Plot the 1230 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  

8. At 0815 your fix is 062°T, 2.6 nm from Westfield church spire. You steer 153°T at 8.6 kn through the water. At 0845 a new fix puts you 327°T, 2.0 nm from Mill stack.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn