Worksheet 71 · Skill 5

Set and drift

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1. At 1115 your fix is 289°T, 3.0 nm from Tern Island tower. You steer 168°T at 6.8 kn through the water. At 1145 a new fix puts you 236°T, 3.1 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1515 your fix is 167°T, 1.6 nm from Tern Island tower. You steer 262°T at 6.3 kn through the water. At 1600 a new fix puts you 064°T, 2.0 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1200 your fix is 121°T, 1.8 nm from Westfield church spire. You steer 049°T at 7.4 kn through the water. At 1235 a new fix puts you 313°T, 3.2 nm from Tern Island tower.

   Plot the 1235 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  

4. At 1455 your fix is 011°T, 3.0 nm from Westfield church spire. You steer 141°T at 7.9 kn through the water. At 1555 a new fix puts you 048°T, 2.4 nm from Mill stack.

   Plot the 1555 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 0755 your fix is 346°T, 0.8 nm from Kittle water tank. You steer 015°T at 5.7 kn through the water. At 0850 a new fix puts you 039°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 0850 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 1310 your fix is 015°T, 1.8 nm from Mill stack. You steer 347°T at 4.0 kn through the water. At 1440 a new fix puts you 305°T, 3.8 nm from Tern Island tower.

   Plot the 1440 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1245 your fix is 079°T, 3.4 nm from Tern Island tower. You steer 280°T at 7.2 kn through the water. At 1330 a new fix puts you 319°T, 2.8 nm from Tern Island tower.

   Plot the 1330 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 1200 your fix is 049°T, 2.4 nm from Heron Point Light. You steer 029°T at 7.5 kn through the water. At 1230 a new fix puts you 272°T, 1.7 nm from Tern Island tower.

   Plot the 1230 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