Worksheet 103 · Skill 5

Set and drift

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1. At 1600 your fix is 302°T, 1.6 nm from Kittle water tank. You steer 034°T at 7.0 kn through the water. At 1635 a new fix puts you 071°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1635 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 1050 your fix is 287°T, 2.3 nm from Tern Island tower. You steer 074°T at 4.4 kn through the water. At 1155 a new fix puts you 353°T, 2.4 nm from Tern Island tower.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1025 your fix is 293°T, 3.6 nm from Tern Island tower. You steer 273°T at 7.4 kn through the water. At 1055 a new fix puts you 008°T, 3.7 nm from Westfield church spire.

   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  

4. At 0705 your fix is 025°T, 2.0 nm from Kittle water tank. You steer 341°T at 5.2 kn through the water. At 0755 a new fix puts you 038°T, 4.1 nm from Gannet Rock daybeacon.

   Plot the 0755 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  

5. At 1305 your fix is 053°T, 2.7 nm from Heron Point Light. You steer 016°T at 4.0 kn through the water. At 1400 a new fix puts you 267°T, 3.0 nm from Tern Island tower.

   Plot the 1400 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  

6. At 1340 your fix is 050°T, 3.7 nm from Westfield church spire. You steer 083°T at 7.5 kn through the water. At 1410 a new fix puts you 018°T, 1.6 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1015 your fix is 062°T, 4.3 nm from Tern Island tower. You steer 222°T at 5.7 kn through the water. At 1135 a new fix puts you 239°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1135 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1045 your fix is 219°T, 1.7 nm from Gannet Rock daybeacon. You steer 306°T at 5.7 kn through the water. At 1200 a new fix puts you 082°T, 1.9 nm from Westfield church spire.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn