Worksheet 14 · Skill 5

Set and drift

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1. At 0710 your fix is 146°T, 1.2 nm from Gannet Rock daybeacon. You steer 243°T at 4.9 kn through the water. At 0750 a new fix puts you 038°T, 2.5 nm from Mill stack.

   Plot the 0750 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  

2. At 1200 your fix is 326°T, 1.5 nm from Gannet Rock daybeacon. You steer 166°T at 4.5 kn through the water. At 1230 a new fix puts you 154°T, 2.9 nm from Tern Island tower.

   Plot the 1230 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 0745 your fix is 074°T, 3.9 nm from Tern Island tower. You steer 222°T at 4.3 kn through the water. At 0855 a new fix puts you 243°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 0855 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  

4. At 1300 your fix is 358°T, 1.8 nm from Gannet Rock daybeacon. You steer 158°T at 7.6 kn through the water. At 1335 a new fix puts you 025°T, 1.5 nm from Kittle water tank.

   Plot the 1335 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 1150 your fix is 286°T, 3.9 nm from Tern Island tower. You steer 135°T at 6.8 kn through the water. At 1245 a new fix puts you 261°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1245 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 1035 your fix is 063°T, 1.4 nm from Gannet Rock daybeacon. You steer 279°T at 7.6 kn through the water. At 1135 a new fix puts you 047°T, 1.2 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1200 your fix is 299°T, 3.9 nm from Tern Island tower. You steer 206°T at 7.8 kn through the water. At 1245 a new fix puts you 091°T, 0.9 nm from Heron Point Light.

   Plot the 1245 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 1430 your fix is 144°T, 3.4 nm from Westfield church spire. You steer 080°T at 4.4 kn through the water. At 1540 a new fix puts you 143°T, 1.5 nm from Tern Island tower.

   Plot the 1540 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