Worksheet 154 · Skill 5

Set and drift

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1. At 1320 your fix is 234°T, 1.8 nm from Gannet Rock daybeacon. You steer 276°T at 7.3 kn through the water. At 1415 a new fix puts you 087°T, 1.2 nm from Westfield church spire.

   Plot the 1415 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  

2. At 1305 your fix is 086°T, 2.5 nm from Westfield church spire. You steer 098°T at 7.8 kn through the water. At 1345 a new fix puts you 267°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1345 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  

3. At 1145 your fix is 291°T, 3.9 nm from Tern Island tower. You steer 212°T at 4.1 kn through the water. At 1225 a new fix puts you 079°T, 3.0 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1520 your fix is 250°T, 1.7 nm from Tern Island tower. You steer 251°T at 5.0 kn through the water. At 1625 a new fix puts you 007°T, 1.2 nm from Heron Point Light.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1025 your fix is 069°T, 3.5 nm from Tern Island tower. You steer 132°T at 4.6 kn through the water. At 1055 a new fix puts you 038°T, 3.4 nm from Gannet Rock daybeacon.

   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 1505 your fix is 332°T, 1.2 nm from Heron Point Light. You steer 112°T at 6.2 kn through the water. At 1545 a new fix puts you 005°T, 1.5 nm from Mill stack.

   Plot the 1545 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 0845 your fix is 063°T, 1.6 nm from Heron Point Light. You steer 015°T at 5.7 kn through the water. At 0930 a new fix puts you 241°T, 2.7 nm from Tern Island tower.

   Plot the 0930 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 1200 your fix is 307°T, 3.6 nm from Tern Island tower. You steer 232°T at 4.7 kn through the water. At 1240 a new fix puts you 050°T, 3.1 nm from Westfield church spire.

   Plot the 1240 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