Worksheet 650 · Skill 5

Set and drift

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1. At 1455 your fix is 040°T, 4.6 nm from Gannet Rock daybeacon. You steer 213°T at 5.8 kn through the water. At 1530 a new fix puts you 084°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1530 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 0910 your fix is 282°T, 1.4 nm from Tern Island tower. You steer 238°T at 4.6 kn through the water. At 1005 a new fix puts you 160°T, 1.0 nm from Westfield church spire.

   Plot the 1005 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  

3. At 1315 your fix is 294°T, 3.3 nm from Tern Island tower. You steer 239°T at 5.2 kn through the water. At 1345 a new fix puts you 044°T, 2.9 nm from Westfield church spire.

   Plot the 1345 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  

4. At 1125 your fix is 054°T, 3.3 nm from Gannet Rock daybeacon. You steer 296°T at 4.5 kn through the water. At 1200 a new fix puts you 083°T, 1.6 nm from Tern Island tower.

   Plot the 1200 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 1410 your fix is 063°T, 3.2 nm from Heron Point Light. You steer 058°T at 5.8 kn through the water. At 1515 a new fix puts you 030°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1515 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 0730 your fix is 018°T, 2.5 nm from Mill stack. You steer 309°T at 6.3 kn through the water. At 0815 a new fix puts you 097°T, 3.1 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1355 your fix is 074°T, 2.5 nm from Tern Island tower. You steer 203°T at 6.5 kn through the water. At 1430 a new fix puts you 145°T, 2.5 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1145 your fix is 188°T, 1.7 nm from Gannet Rock daybeacon. You steer 036°T at 5.1 kn through the water. At 1225 a new fix puts you 061°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1225 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