Worksheet 60 · Skill 5

Set and drift

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1. At 1420 your fix is 048°T, 4.1 nm from Westfield church spire. You steer 203°T at 4.1 kn through the water. At 1525 a new fix puts you 069°T, 2.2 nm from Westfield church spire.

   Plot the 1525 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  

2. At 1420 your fix is 301°T, 1.6 nm from Kittle water tank. You steer 281°T at 8.0 kn through the water. At 1450 a new fix puts you 349°T, 1.6 nm from Mill stack.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1430 your fix is 312°T, 2.7 nm from Tern Island tower. You steer 276°T at 4.0 kn through the water. At 1500 a new fix puts you 050°T, 3.4 nm from Westfield church spire.

   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  

4. At 0900 your fix is 343°T, 2.6 nm from Mill stack. You steer 315°T at 6.9 kn through the water. At 0945 a new fix puts you 058°T, 2.4 nm from Westfield church spire.

   Plot the 0945 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 1435 your fix is 072°T, 3.5 nm from Westfield church spire. You steer 220°T at 4.9 kn through the water. At 1520 a new fix puts you 102°T, 1.5 nm from Westfield church spire.

   Plot the 1520 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 1400 your fix is 093°T, 2.8 nm from Gannet Rock daybeacon. You steer 001°T at 5.6 kn through the water. At 1435 a new fix puts you 044°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1435 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 0745 your fix is 044°T, 1.4 nm from Tern Island tower. You steer 276°T at 6.0 kn through the water. At 0850 a new fix puts you 019°T, 2.7 nm from Westfield church spire.

   Plot the 0850 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 0940 your fix is 351°T, 2.0 nm from Heron Point Light. You steer 091°T at 7.1 kn through the water. At 1040 a new fix puts you 131°T, 2.8 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn