Worksheet 762 · Skill 5

Set and drift

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1. At 1325 your fix is 319°T, 1.2 nm from Kittle water tank. You steer 316°T at 7.6 kn through the water. At 1410 a new fix puts you 284°T, 3.0 nm from Tern Island tower.

   Plot the 1410 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 0855 your fix is 335°T, 2.1 nm from Mill stack. You steer 318°T at 4.9 kn through the water. At 1020 a new fix puts you 032°T, 4.3 nm from Westfield church spire.

   Plot the 1020 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1425 your fix is 078°T, 2.5 nm from Westfield church spire. You steer 164°T at 7.7 kn through the water. At 1455 a new fix puts you 076°T, 2.1 nm from Heron Point Light.

   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  

4. At 1320 your fix is 266°T, 2.7 nm from Tern Island tower. You steer 196°T at 4.1 kn through the water. At 1405 a new fix puts you 003°T, 1.2 nm from Heron Point Light.

   Plot the 1405 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 1025 your fix is 093°T, 2.4 nm from Westfield church spire. You steer 169°T at 4.9 kn through the water. At 1055 a new fix puts you 062°T, 1.0 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1035 your fix is 083°T, 2.9 nm from Gannet Rock daybeacon. You steer 320°T at 7.7 kn through the water. At 1115 a new fix puts you 046°T, 2.9 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1530 your fix is 014°T, 2.7 nm from Mill stack. You steer 314°T at 7.5 kn through the water. At 1625 a new fix puts you 037°T, 4.5 nm from Westfield church spire.

   Plot the 1625 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 0725 your fix is 021°T, 2.3 nm from Gannet Rock daybeacon. You steer 225°T at 5.1 kn through the water. At 0830 a new fix puts you 078°T, 2.0 nm from Heron Point Light.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn