Worksheet 170 · Skill 5

Set and drift

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1. At 1115 your fix is 355°T, 3.1 nm from Mill stack. You steer 320°T at 5.9 kn through the water. At 1210 a new fix puts you 001°T, 2.8 nm from Westfield church spire.

   Plot the 1210 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  

2. At 1005 your fix is 232°T, 0.9 nm from Gannet Rock daybeacon. You steer 270°T at 7.8 kn through the water. At 1050 a new fix puts you 013°T, 0.9 nm from Heron Point Light.

   Plot the 1050 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 0735 your fix is 010°T, 3.5 nm from Westfield church spire. You steer 130°T at 6.8 kn through the water. At 0835 a new fix puts you 273°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 0835 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  

4. At 1030 your fix is 283°T, 1.1 nm from Gannet Rock daybeacon. You steer 264°T at 4.5 kn through the water. At 1125 a new fix puts you 007°T, 2.6 nm from Mill stack.

   Plot the 1125 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  

5. At 1120 your fix is 275°T, 3.6 nm from Tern Island tower. You steer 134°T at 8.8 kn through the water. At 1200 a new fix puts you 219°T, 2.6 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1025 your fix is 228°T, 1.9 nm from Tern Island tower. You steer 210°T at 5.1 kn through the water. At 1055 a new fix puts you 333°T, 2.3 nm from Mill stack.

   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  

7. At 1455 your fix is 023°T, 1.5 nm from Kittle water tank. You steer 014°T at 4.4 kn through the water. At 1525 a new fix puts you 093°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1525 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  

8. At 1210 your fix is 088°T, 3.4 nm from Westfield church spire. You steer 350°T at 5.4 kn through the water. At 1245 a new fix puts you 048°T, 3.7 nm from Westfield church spire.

   Plot the 1245 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