Worksheet 428 · Skill 5

Set and drift

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1. At 0935 your fix is 052°T, 3.3 nm from Westfield church spire. You steer 126°T at 5.9 kn through the water. At 1005 a new fix puts you 281°T, 2.2 nm from Tern Island tower.

   Plot the 1005 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  

2. At 0910 your fix is 007°T, 1.8 nm from Heron Point Light. You steer 350°T at 7.9 kn through the water. At 0950 a new fix puts you 038°T, 4.2 nm from Westfield church spire.

   Plot the 0950 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 1435 your fix is 056°T, 3.9 nm from Tern Island tower. You steer 166°T at 8.3 kn through the water. At 1510 a new fix puts you 070°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1510 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 0700 your fix is 035°T, 1.1 nm from Heron Point Light. You steer 096°T at 8.3 kn through the water. At 0730 a new fix puts you 017°T, 2.1 nm from Mill stack.

   Plot the 0730 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  

5. At 1410 your fix is 012°T, 2.3 nm from Mill stack. You steer 056°T at 7.4 kn through the water. At 1450 a new fix puts you 094°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1450 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 1410 your fix is 030°T, 2.8 nm from Westfield church spire. You steer 169°T at 6.3 kn through the water. At 1445 a new fix puts you 109°T, 2.2 nm from Westfield church spire.

   Plot the 1445 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 1425 your fix is 089°T, 1.8 nm from Gannet Rock daybeacon. You steer 338°T at 6.3 kn through the water. At 1455 a new fix puts you 065°T, 2.5 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1010 your fix is 034°T, 2.8 nm from Westfield church spire. You steer 152°T at 5.1 kn through the water. At 1045 a new fix puts you 242°T, 3.4 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