Worksheet 443 · Skill 5

Set and drift

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1. At 1215 your fix is 008°T, 2.8 nm from Westfield church spire. You steer 129°T at 7.9 kn through the water. At 1305 a new fix puts you 200°T, 2.1 nm from Tern Island tower.

   Plot the 1305 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  

2. At 1105 your fix is 094°T, 1.7 nm from Westfield church spire. You steer 115°T at 4.7 kn through the water. At 1200 a new fix puts you 239°T, 2.6 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0935 your fix is 297°T, 2.0 nm from Kittle water tank. You steer 317°T at 5.5 kn through the water. At 1040 a new fix puts you 273°T, 3.7 nm from Tern Island tower.

   Plot the 1040 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  

4. At 1440 your fix is 307°T, 1.6 nm from Kittle water tank. You steer 312°T at 8.2 kn through the water. At 1535 a new fix puts you 049°T, 2.6 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0945 your fix is 075°T, 2.2 nm from Tern Island tower. You steer 145°T at 6.4 kn through the water. At 1020 a new fix puts you 081°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1020 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  

6. At 1000 your fix is 070°T, 2.0 nm from Gannet Rock daybeacon. You steer 314°T at 4.0 kn through the water. At 1035 a new fix puts you 110°T, 1.5 nm from Tern Island tower.

   Plot the 1035 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 1455 your fix is 048°T, 1.7 nm from Gannet Rock daybeacon. You steer 036°T at 4.5 kn through the water. At 1540 a new fix puts you 072°T, 4.4 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1035 your fix is 058°T, 1.7 nm from Westfield church spire. You steer 122°T at 4.7 kn through the water. At 1145 a new fix puts you 311°T, 1.5 nm from Gannet Rock daybeacon.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn