Worksheet 186 · Skill 5

Set and drift

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1. At 1250 your fix is 060°T, 3.0 nm from Heron Point Light. You steer 272°T at 5.4 kn through the water. At 1325 a new fix puts you 341°T, 1.4 nm from Heron Point Light.

   Plot the 1325 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 1325 your fix is 012°T, 1.2 nm from Kittle water tank. You steer 026°T at 6.2 kn through the water. At 1355 a new fix puts you 055°T, 3.2 nm from Gannet Rock daybeacon.

   Plot the 1355 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 0810 your fix is 007°T, 1.8 nm from Tern Island tower. You steer 115°T at 5.3 kn through the water. At 0850 a new fix puts you 068°T, 4.5 nm from Tern Island tower.

   Plot the 0850 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 1105 your fix is 009°T, 2.2 nm from Tern Island tower. You steer 144°T at 6.0 kn through the water. At 1215 a new fix puts you 099°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1215 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  

5. At 1500 your fix is 204°T, 1.3 nm from Tern Island tower. You steer 212°T at 5.7 kn through the water. At 1545 a new fix puts you 325°T, 1.3 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1045 your fix is 345°T, 1.2 nm from Heron Point Light. You steer 036°T at 6.9 kn through the water. At 1130 a new fix puts you 310°T, 3.0 nm from Tern Island tower.

   Plot the 1130 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  

7. At 1010 your fix is 260°T, 2.6 nm from Gannet Rock daybeacon. You steer 329°T at 6.1 kn through the water. At 1055 a new fix puts you 277°T, 2.7 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0825 your fix is 235°T, 2.2 nm from Gannet Rock daybeacon. You steer 309°T at 4.0 kn through the water. At 0955 a new fix puts you 083°T, 3.4 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn