Worksheet 916 · Skill 5

Set and drift

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1. At 0740 your fix is 033°T, 3.7 nm from Gannet Rock daybeacon. You steer 191°T at 7.5 kn through the water. At 0820 a new fix puts you 026°T, 1.3 nm from Kittle water tank.

   Plot the 0820 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 1250 your fix is 351°T, 2.5 nm from Mill stack. You steer 044°T at 5.2 kn through the water. At 1325 a new fix puts you 295°T, 1.5 nm from Gannet Rock daybeacon.

   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  

3. At 0850 your fix is 035°T, 3.8 nm from Westfield church spire. You steer 131°T at 7.6 kn through the water. At 1000 a new fix puts you 215°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1000 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  

4. At 1345 your fix is 064°T, 1.3 nm from Westfield church spire. You steer 337°T at 4.9 kn through the water. At 1415 a new fix puts you 026°T, 2.5 nm from Westfield church spire.

   Plot the 1415 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  

5. At 1025 your fix is 000°T, 2.4 nm from Tern Island tower. You steer 136°T at 6.5 kn through the water. At 1055 a new fix puts you 025°T, 3.0 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0900 your fix is 034°T, 2.1 nm from Kittle water tank. You steer 336°T at 8.4 kn through the water. At 0935 a new fix puts you 072°T, 1.7 nm from Tern Island tower.

   Plot the 0935 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  

7. At 1100 your fix is 033°T, 2.6 nm from Kittle water tank. You steer 274°T at 8.4 kn through the water. At 1145 a new fix puts you 057°T, 2.9 nm from Heron Point Light.

   Plot the 1145 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 0745 your fix is 049°T, 3.5 nm from Heron Point Light. You steer 330°T at 5.9 kn through the water. At 0825 a new fix puts you 054°T, 3.2 nm from Westfield church spire.

   Plot the 0825 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