Worksheet 767 · Skill 5

Set and drift

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1. At 1415 your fix is 290°T, 3.6 nm from Tern Island tower. You steer 194°T at 5.7 kn through the water. At 1455 a new fix puts you 039°T, 2.0 nm from Heron Point Light.

   Plot the 1455 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 0920 your fix is 038°T, 1.9 nm from Tern Island tower. You steer 260°T at 4.2 kn through the water. At 1045 a new fix puts you 061°T, 1.9 nm from Westfield church spire.

   Plot the 1045 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1530 your fix is 092°T, 2.0 nm from Westfield church spire. You steer 314°T at 4.2 kn through the water. At 1600 a new fix puts you 028°T, 2.1 nm from Westfield church spire.

   Plot the 1600 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 1355 your fix is 026°T, 2.0 nm from Tern Island tower. You steer 139°T at 5.9 kn through the water. At 1455 a new fix puts you 092°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1455 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  

5. At 0915 your fix is 029°T, 1.5 nm from Tern Island tower. You steer 060°T at 4.6 kn through the water. At 0945 a new fix puts you 060°T, 4.3 nm from Tern Island tower.

   Plot the 0945 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 0810 your fix is 068°T, 4.4 nm from Tern Island tower. You steer 172°T at 6.8 kn through the water. At 0905 a new fix puts you 006°T, 1.4 nm from Kittle water tank.

   Plot the 0905 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  

7. At 1520 your fix is 007°T, 2.0 nm from Gannet Rock daybeacon. You steer 144°T at 5.9 kn through the water. At 1600 a new fix puts you 038°T, 1.9 nm from Kittle water tank.

   Plot the 1600 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  

8. At 0710 your fix is 321°T, 2.6 nm from Tern Island tower. You steer 173°T at 8.5 kn through the water. At 0755 a new fix puts you 342°T, 1.7 nm from Mill stack.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn