Worksheet 514 · Skill 5

Set and drift

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1. At 1600 your fix is 250°T, 2.8 nm from Tern Island tower. You steer 124°T at 7.0 kn through the water. At 1645 a new fix puts you 208°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1645 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 1255 your fix is 093°T, 3.6 nm from Westfield church spire. You steer 333°T at 4.1 kn through the water. At 1335 a new fix puts you 075°T, 3.1 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0930 your fix is 064°T, 2.6 nm from Tern Island tower. You steer 140°T at 4.9 kn through the water. At 1000 a new fix puts you 026°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1000 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 1330 your fix is 007°T, 1.7 nm from Heron Point Light. You steer 141°T at 4.4 kn through the water. At 1405 a new fix puts you 320°T, 2.0 nm from Mill stack.

   Plot the 1405 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 0710 your fix is 352°T, 1.6 nm from Tern Island tower. You steer 253°T at 5.7 kn through the water. At 0745 a new fix puts you 055°T, 3.7 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1420 your fix is 030°T, 3.5 nm from Heron Point Light. You steer 316°T at 7.1 kn through the water. At 1500 a new fix puts you 035°T, 2.8 nm from Westfield church spire.

   Plot the 1500 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 0840 your fix is 052°T, 3.8 nm from Westfield church spire. You steer 160°T at 5.7 kn through the water. At 0910 a new fix puts you 243°T, 3.1 nm from Tern Island tower.

   Plot the 0910 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 1050 your fix is 226°T, 1.2 nm from Gannet Rock daybeacon. You steer 244°T at 4.2 kn through the water. At 1120 a new fix puts you 047°T, 2.6 nm from Mill stack.

   Plot the 1120 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