Worksheet 169 · Skill 5

Set and drift

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1. At 1230 your fix is 337°T, 1.4 nm from Gannet Rock daybeacon. You steer 090°T at 4.8 kn through the water. At 1310 a new fix puts you 047°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1310 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 1445 your fix is 239°T, 2.4 nm from Gannet Rock daybeacon. You steer 339°T at 8.4 kn through the water. At 1525 a new fix puts you 312°T, 3.4 nm from Tern Island tower.

   Plot the 1525 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 1525 your fix is 058°T, 3.3 nm from Tern Island tower. You steer 168°T at 4.1 kn through the water. At 1615 a new fix puts you 062°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1615 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  

4. At 1000 your fix is 025°T, 2.5 nm from Tern Island tower. You steer 253°T at 4.1 kn through the water. At 1130 a new fix puts you 009°T, 2.9 nm from Westfield church spire.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1500 your fix is 350°T, 1.5 nm from Gannet Rock daybeacon. You steer 204°T at 4.3 kn through the water. At 1605 a new fix puts you 231°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1605 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1125 your fix is 222°T, 1.1 nm from Gannet Rock daybeacon. You steer 319°T at 4.0 kn through the water. At 1155 a new fix puts you 264°T, 2.0 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1540 your fix is 335°T, 1.3 nm from Heron Point Light. You steer 080°T at 4.4 kn through the water. At 1615 a new fix puts you 046°T, 1.3 nm from Heron Point Light.

   Plot the 1615 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  

8. At 1315 your fix is 223°T, 2.1 nm from Gannet Rock daybeacon. You steer 324°T at 4.0 kn through the water. At 1430 a new fix puts you 297°T, 3.4 nm from Tern Island tower.

   Plot the 1430 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