Worksheet 311 · Skill 5

Set and drift

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1. At 1535 your fix is 019°T, 1.7 nm from Tern Island tower. You steer 126°T at 5.9 kn through the water. At 1610 a new fix puts you 030°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1610 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 1255 your fix is 292°T, 3.3 nm from Tern Island tower. You steer 175°T at 6.4 kn through the water. At 1335 a new fix puts you 351°T, 3.2 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1310 your fix is 302°T, 1.6 nm from Gannet Rock daybeacon. You steer 287°T at 4.1 kn through the water. At 1410 a new fix puts you 031°T, 3.0 nm from Heron Point Light.

   Plot the 1410 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  

4. At 1245 your fix is 322°T, 3.2 nm from Kittle water tank. You steer 270°T at 4.1 kn through the water. At 1340 a new fix puts you 236°T, 2.7 nm from Tern Island tower.

   Plot the 1340 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  

5. At 0725 your fix is 114°T, 2.1 nm from Westfield church spire. You steer 123°T at 5.7 kn through the water. At 0815 a new fix puts you 011°T, 2.3 nm from Mill stack.

   Plot the 0815 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  

6. At 1105 your fix is 150°T, 1.3 nm from Tern Island tower. You steer 200°T at 4.1 kn through the water. At 1150 a new fix puts you 021°T, 2.2 nm from Mill stack.

   Plot the 1150 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 249°T, 2.4 nm from Gannet Rock daybeacon. You steer 112°T at 4.2 kn through the water. At 1055 a new fix puts you 284°T, 2.2 nm from Kittle water tank.

   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 0915 your fix is 005°T, 0.8 nm from Kittle water tank. You steer 013°T at 4.3 kn through the water. At 0950 a new fix puts you 125°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 0950 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