Worksheet 706 · Skill 5

Set and drift

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1. At 0945 your fix is 040°T, 2.1 nm from Westfield church spire. You steer 060°T at 4.5 kn through the water. At 1020 a new fix puts you 294°T, 3.2 nm from Tern Island tower.

   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  

2. At 0720 your fix is 227°T, 2.0 nm from Tern Island tower. You steer 139°T at 6.1 kn through the water. At 0750 a new fix puts you 210°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 0750 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  

3. At 1050 your fix is 239°T, 2.2 nm from Tern Island tower. You steer 254°T at 5.6 kn through the water. At 1135 a new fix puts you 080°T, 1.7 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1025 your fix is 120°T, 1.5 nm from Gannet Rock daybeacon. You steer 343°T at 5.8 kn through the water. At 1100 a new fix puts you 004°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1100 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 1540 your fix is 037°T, 2.3 nm from Kittle water tank. You steer 264°T at 4.9 kn through the water. At 1610 a new fix puts you 326°T, 1.5 nm from Kittle water tank.

   Plot the 1610 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 0730 your fix is 191°T, 2.0 nm from Tern Island tower. You steer 061°T at 7.4 kn through the water. At 0805 a new fix puts you 082°T, 2.9 nm from Tern Island tower.

   Plot the 0805 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 1105 your fix is 040°T, 3.1 nm from Tern Island tower. You steer 160°T at 6.4 kn through the water. At 1205 a new fix puts you 072°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1205 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0915 your fix is 200°T, 1.6 nm from Tern Island tower. You steer 245°T at 4.0 kn through the water. At 1010 a new fix puts you 024°T, 1.9 nm from Heron Point Light.

   Plot the 1010 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