Worksheet 490 · Skill 5

Set and drift

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1. At 0730 your fix is 018°T, 3.2 nm from Westfield church spire. You steer 092°T at 6.8 kn through the water. At 0805 a new fix puts you 315°T, 1.6 nm from Tern Island tower.

   Plot the 0805 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 1205 your fix is 276°T, 2.9 nm from Tern Island tower. You steer 239°T at 4.0 kn through the water. At 1255 a new fix puts you 099°T, 2.8 nm from Westfield church spire.

   Plot the 1255 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  

3. At 1010 your fix is 347°T, 2.6 nm from Mill stack. You steer 334°T at 6.3 kn through the water. At 1045 a new fix puts you 286°T, 3.7 nm from Tern Island tower.

   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  

4. At 0720 your fix is 336°T, 2.3 nm from Mill stack. You steer 346°T at 4.0 kn through the water. At 0755 a new fix puts you 242°T, 3.4 nm from Tern Island tower.

   Plot the 0755 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 1430 your fix is 117°T, 1.4 nm from Westfield church spire. You steer 068°T at 8.0 kn through the water. At 1500 a new fix puts you 262°T, 1.9 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1505 your fix is 145°T, 0.9 nm from Gannet Rock daybeacon. You steer 013°T at 4.9 kn through the water. At 1545 a new fix puts you 033°T, 3.5 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  

7. At 1220 your fix is 352°T, 1.9 nm from Mill stack. You steer 297°T at 4.7 kn through the water. At 1325 a new fix puts you 065°T, 1.3 nm from Westfield church spire.

   Plot the 1325 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  

8. At 1135 your fix is 068°T, 4.2 nm from Tern Island tower. You steer 274°T at 6.2 kn through the water. At 1300 a new fix puts you 055°T, 3.7 nm from Westfield church spire.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn