Worksheet 639 · Skill 5

Set and drift

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1. At 0755 your fix is 346°T, 1.9 nm from Heron Point Light. You steer 102°T at 4.1 kn through the water. At 0855 a new fix puts you 206°T, 3.2 nm from Tern Island tower.

   Plot the 0855 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1540 your fix is 029°T, 3.4 nm from Heron Point Light. You steer 325°T at 6.2 kn through the water. At 1620 a new fix puts you 030°T, 3.5 nm from Westfield church spire.

   Plot the 1620 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 1315 your fix is 353°T, 2.0 nm from Heron Point Light. You steer 041°T at 8.5 kn through the water. At 1400 a new fix puts you 315°T, 2.6 nm from Tern Island tower.

   Plot the 1400 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  

4. At 0700 your fix is 264°T, 2.8 nm from Gannet Rock daybeacon. You steer 110°T at 7.6 kn through the water. At 0745 a new fix puts you 056°T, 1.8 nm from Kittle water tank.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0850 your fix is 305°T, 3.5 nm from Mill stack. You steer 069°T at 5.9 kn through the water. At 0930 a new fix puts you 001°T, 3.2 nm from Mill stack.

   Plot the 0930 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 0950 your fix is 034°T, 2.6 nm from Kittle water tank. You steer 329°T at 6.6 kn through the water. At 1025 a new fix puts you 027°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1025 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 1055 your fix is 217°T, 2.5 nm from Tern Island tower. You steer 149°T at 5.3 kn through the water. At 1130 a new fix puts you 216°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1130 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  

8. At 1320 your fix is 305°T, 3.4 nm from Tern Island tower. You steer 199°T at 4.3 kn through the water. At 1450 a new fix puts you 037°T, 2.7 nm from Heron Point Light.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn