Worksheet 305 · Skill 5

Set and drift

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1. At 1410 your fix is 295°T, 4.3 nm from Tern Island tower. You steer 168°T at 8.1 kn through the water. At 1455 a new fix puts you 352°T, 2.6 nm from Mill stack.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0715 your fix is 242°T, 3.3 nm from Tern Island tower. You steer 248°T at 6.3 kn through the water. At 0745 a new fix puts you 166°T, 1.7 nm from Westfield church spire.

   Plot the 0745 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 1520 your fix is 347°T, 1.5 nm from Tern Island tower. You steer 269°T at 8.9 kn through the water. At 1600 a new fix puts you 004°T, 3.0 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1545 your fix is 053°T, 2.5 nm from Heron Point Light. You steer 103°T at 4.0 kn through the water. At 1625 a new fix puts you 227°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1625 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  

5. At 1125 your fix is 109°T, 1.0 nm from Gannet Rock daybeacon. You steer 260°T at 7.3 kn through the water. At 1215 a new fix puts you 061°T, 1.9 nm from Heron Point Light.

   Plot the 1215 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  

6. At 0735 your fix is 014°T, 3.5 nm from Westfield church spire. You steer 140°T at 5.9 kn through the water. At 0805 a new fix puts you 048°T, 3.6 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1220 your fix is 025°T, 1.6 nm from Kittle water tank. You steer 272°T at 7.5 kn through the water. At 1255 a new fix puts you 223°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1255 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  

8. At 0725 your fix is 034°T, 1.7 nm from Kittle water tank. You steer 284°T at 7.1 kn through the water. At 0755 a new fix puts you 257°T, 1.5 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn