Worksheet 852 · Skill 5

Set and drift

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1. At 0905 your fix is 008°T, 1.3 nm from Westfield church spire. You steer 140°T at 5.3 kn through the water. At 1025 a new fix puts you 054°T, 3.3 nm from Heron Point Light.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1005 your fix is 080°T, 2.8 nm from Westfield church spire. You steer 146°T at 8.8 kn through the water. At 1035 a new fix puts you 014°T, 1.2 nm from Mill stack.

   Plot the 1035 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 0755 your fix is 148°T, 1.3 nm from Tern Island tower. You steer 196°T at 6.2 kn through the water. At 0835 a new fix puts you 283°T, 2.2 nm from Kittle water tank.

   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  

4. At 1300 your fix is 051°T, 3.9 nm from Tern Island tower. You steer 263°T at 6.7 kn through the water. At 1405 a new fix puts you 302°T, 4.3 nm from Tern Island tower.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1200 your fix is 324°T, 2.2 nm from Mill stack. You steer 339°T at 7.1 kn through the water. At 1235 a new fix puts you 078°T, 3.1 nm from Westfield church spire.

   Plot the 1235 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  

6. At 1240 your fix is 263°T, 1.9 nm from Tern Island tower. You steer 135°T at 4.9 kn through the water. At 1350 a new fix puts you 332°T, 1.1 nm from Kittle water tank.

   Plot the 1350 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0915 your fix is 003°T, 1.7 nm from Gannet Rock daybeacon. You steer 046°T at 8.4 kn through the water. At 0945 a new fix puts you 062°T, 5.4 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1445 your fix is 283°T, 1.9 nm from Gannet Rock daybeacon. You steer 314°T at 5.0 kn through the water. At 1530 a new fix puts you 258°T, 2.1 nm from Tern Island tower.

   Plot the 1530 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