Worksheet 645 · Skill 5

Set and drift

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1. At 1525 your fix is 275°T, 3.7 nm from Tern Island tower. You steer 056°T at 4.9 kn through the water. At 1605 a new fix puts you 330°T, 2.8 nm from Tern Island tower.

   Plot the 1605 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  

2. At 1200 your fix is 237°T, 1.9 nm from Gannet Rock daybeacon. You steer 305°T at 7.1 kn through the water. At 1300 a new fix puts you 060°T, 3.2 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1230 your fix is 052°T, 3.9 nm from Westfield church spire. You steer 124°T at 7.9 kn through the water. At 1300 a new fix puts you 186°T, 1.7 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0940 your fix is 057°T, 2.2 nm from Tern Island tower. You steer 129°T at 5.4 kn through the water. At 1015 a new fix puts you 044°T, 4.1 nm from Gannet Rock daybeacon.

   Plot the 1015 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 0745 your fix is 066°T, 2.4 nm from Heron Point Light. You steer 005°T at 6.2 kn through the water. At 0830 a new fix puts you 284°T, 2.1 nm from Tern Island tower.

   Plot the 0830 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  

6. At 1005 your fix is 077°T, 1.9 nm from Tern Island tower. You steer 165°T at 6.3 kn through the water. At 1055 a new fix puts you 030°T, 2.1 nm from Kittle water tank.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1505 your fix is 142°T, 1.1 nm from Westfield church spire. You steer 122°T at 4.8 kn through the water. At 1600 a new fix puts you 358°T, 2.5 nm from Mill stack.

   Plot the 1600 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1025 your fix is 034°T, 2.1 nm from Tern Island tower. You steer 273°T at 6.5 kn through the water. At 1115 a new fix puts you 041°T, 4.7 nm from Westfield church spire.

   Plot the 1115 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