Worksheet 404 · Skill 5

Set and drift

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1. At 0750 your fix is 097°T, 1.3 nm from Gannet Rock daybeacon. You steer 238°T at 5.3 kn through the water. At 0820 a new fix puts you 202°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 0820 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 1130 your fix is 017°T, 3.7 nm from Westfield church spire. You steer 157°T at 5.4 kn through the water. At 1250 a new fix puts you 116°T, 2.1 nm from Westfield church spire.

   Plot the 1250 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  

3. At 1000 your fix is 238°T, 2.2 nm from Gannet Rock daybeacon. You steer 312°T at 6.7 kn through the water. At 1030 a new fix puts you 048°T, 3.2 nm from Heron Point Light.

   Plot the 1030 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 1150 your fix is 020°T, 1.4 nm from Tern Island tower. You steer 082°T at 4.0 kn through the water. At 1225 a new fix puts you 056°T, 3.7 nm from Tern Island tower.

   Plot the 1225 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 1425 your fix is 030°T, 2.9 nm from Heron Point Light. You steer 088°T at 8.0 kn through the water. At 1500 a new fix puts you 290°T, 1.6 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1110 your fix is 306°T, 1.6 nm from Gannet Rock daybeacon. You steer 065°T at 7.4 kn through the water. At 1140 a new fix puts you 023°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1140 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  

7. At 1205 your fix is 196°T, 1.8 nm from Gannet Rock daybeacon. You steer 032°T at 6.9 kn through the water. At 1250 a new fix puts you 038°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1250 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  

8. At 1525 your fix is 021°T, 1.6 nm from Gannet Rock daybeacon. You steer 239°T at 7.1 kn through the water. At 1615 a new fix puts you 021°T, 2.1 nm from Mill stack.

   Plot the 1615 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