Worksheet 79 · Skill 5

Set and drift

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1. At 1515 your fix is 349°T, 2.4 nm from Tern Island tower. You steer 099°T at 7.7 kn through the water. At 1550 a new fix puts you 062°T, 3.5 nm from Tern Island tower.

   Plot the 1550 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  

2. At 0935 your fix is 187°T, 2.1 nm from Tern Island tower. You steer 292°T at 4.4 kn through the water. At 1050 a new fix puts you 074°T, 2.5 nm from Westfield church spire.

   Plot the 1050 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1550 your fix is 305°T, 1.6 nm from Gannet Rock daybeacon. You steer 212°T at 7.4 kn through the water. At 1620 a new fix puts you 320°T, 1.2 nm from Mill stack.

   Plot the 1620 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 1015 your fix is 226°T, 2.9 nm from Tern Island tower. You steer 294°T at 7.1 kn through the water. At 1050 a new fix puts you 022°T, 1.7 nm from Westfield church spire.

   Plot the 1050 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 0815 your fix is 027°T, 3.6 nm from Westfield church spire. You steer 132°T at 4.1 kn through the water. At 0910 a new fix puts you 067°T, 2.4 nm from Westfield church spire.

   Plot the 0910 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  

6. At 1415 your fix is 231°T, 1.3 nm from Gannet Rock daybeacon. You steer 283°T at 6.4 kn through the water. At 1455 a new fix puts you 018°T, 2.6 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1025 your fix is 156°T, 3.1 nm from Tern Island tower. You steer 259°T at 6.7 kn through the water. At 1105 a new fix puts you 059°T, 2.3 nm from Heron Point Light.

   Plot the 1105 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  

8. At 1425 your fix is 026°T, 3.9 nm from Westfield church spire. You steer 139°T at 4.8 kn through the water. At 1515 a new fix puts you 269°T, 2.4 nm from Tern Island tower.

   Plot the 1515 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