Worksheet 442 · Skill 5

Set and drift

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1. At 0925 your fix is 320°T, 2.9 nm from Tern Island tower. You steer 246°T at 6.6 kn through the water. At 0955 a new fix puts you 053°T, 1.9 nm from Westfield church spire.

   Plot the 0955 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  

2. At 1555 your fix is 095°T, 3.0 nm from Westfield church spire. You steer 128°T at 8.2 kn through the water. At 1640 a new fix puts you 049°T, 2.5 nm from Mill stack.

   Plot the 1640 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  

3. At 1050 your fix is 098°T, 2.0 nm from Westfield church spire. You steer 113°T at 6.6 kn through the water. At 1135 a new fix puts you 271°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1135 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  

4. At 1255 your fix is 066°T, 3.8 nm from Tern Island tower. You steer 196°T at 8.6 kn through the water. At 1340 a new fix puts you 127°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1340 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 0800 your fix is 013°T, 1.7 nm from Mill stack. You steer 021°T at 4.6 kn through the water. At 0835 a new fix puts you 274°T, 1.8 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1025 your fix is 238°T, 2.0 nm from Tern Island tower. You steer 170°T at 4.3 kn through the water. At 1120 a new fix puts you 048°T, 1.2 nm from Mill stack.

   Plot the 1120 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  

7. At 0920 your fix is 004°T, 1.7 nm from Gannet Rock daybeacon. You steer 242°T at 4.7 kn through the water. At 0955 a new fix puts you 211°T, 2.1 nm from Tern Island tower.

   Plot the 0955 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  

8. At 0715 your fix is 225°T, 1.1 nm from Gannet Rock daybeacon. You steer 278°T at 8.1 kn through the water. At 0745 a new fix puts you 063°T, 2.3 nm from Heron Point Light.

   Plot the 0745 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