Worksheet 82 · Skill 5

Set and drift

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1. At 1010 your fix is 103°T, 2.3 nm from Westfield church spire. You steer 048°T at 5.5 kn through the water. At 1055 a new fix puts you 291°T, 2.2 nm from Tern Island tower.

   Plot the 1055 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 1245 your fix is 305°T, 1.6 nm from Kittle water tank. You steer 264°T at 6.6 kn through the water. At 1315 a new fix puts you 333°T, 1.3 nm from Mill stack.

   Plot the 1315 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 0945 your fix is 337°T, 1.8 nm from Heron Point Light. You steer 052°T at 7.9 kn through the water. At 1050 a new fix puts you 019°T, 1.8 nm from Tern Island tower.

   Plot the 1050 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  

4. At 0755 your fix is 073°T, 2.0 nm from Westfield church spire. You steer 073°T at 4.1 kn through the water. At 0835 a new fix puts you 255°T, 2.5 nm from Tern Island tower.

   Plot the 0835 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  

5. At 1400 your fix is 336°T, 1.5 nm from Heron Point Light. You steer 078°T at 8.3 kn through the water. At 1450 a new fix puts you 190°T, 1.2 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1020 your fix is 346°T, 2.4 nm from Mill stack. You steer 083°T at 6.9 kn through the water. At 1105 a new fix puts you 006°T, 1.7 nm from Kittle water tank.

   Plot the 1105 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  

7. At 1000 your fix is 228°T, 1.2 nm from Tern Island tower. You steer 142°T at 5.9 kn through the water. At 1040 a new fix puts you 326°T, 3.1 nm from Kittle water tank.

   Plot the 1040 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  

8. At 0715 your fix is 296°T, 4.3 nm from Tern Island tower. You steer 140°T at 5.9 kn through the water. At 0750 a new fix puts you 254°T, 1.5 nm from Tern Island tower.

   Plot the 0750 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