Worksheet 372 · Skill 5

Set and drift

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1. At 1315 your fix is 251°T, 2.4 nm from Gannet Rock daybeacon. You steer 040°T at 5.0 kn through the water. At 1410 a new fix puts you 046°T, 3.5 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1325 your fix is 238°T, 3.2 nm from Tern Island tower. You steer 136°T at 4.4 kn through the water. At 1410 a new fix puts you 272°T, 1.7 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1520 your fix is 258°T, 2.7 nm from Tern Island tower. You steer 136°T at 4.3 kn through the water. At 1600 a new fix puts you 202°T, 2.6 nm from Tern Island tower.

   Plot the 1600 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 1500 your fix is 311°T, 3.6 nm from Tern Island tower. You steer 196°T at 5.3 kn through the water. At 1540 a new fix puts you 025°T, 3.1 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0830 your fix is 019°T, 1.9 nm from Kittle water tank. You steer 012°T at 6.0 kn through the water. At 0900 a new fix puts you 073°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 0900 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 1435 your fix is 111°T, 2.5 nm from Westfield church spire. You steer 091°T at 6.2 kn through the water. At 1535 a new fix puts you 341°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1535 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 0815 your fix is 193°T, 0.8 nm from Gannet Rock daybeacon. You steer 249°T at 4.6 kn through the water. At 0915 a new fix puts you 351°T, 3.4 nm from Mill stack.

   Plot the 0915 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  

8. At 1110 your fix is 193°T, 2.1 nm from Gannet Rock daybeacon. You steer 311°T at 5.2 kn through the water. At 1155 a new fix puts you 042°T, 3.4 nm from Heron Point Light.

   Plot the 1155 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