Worksheet 527 · Skill 5

Set and drift

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1. At 0800 your fix is 002°T, 2.3 nm from Tern Island tower. You steer 142°T at 4.1 kn through the water. At 0905 a new fix puts you 049°T, 2.3 nm from Gannet Rock daybeacon.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1015 your fix is 348°T, 1.1 nm from Heron Point Light. You steer 093°T at 5.0 kn through the water. At 1055 a new fix puts you 067°T, 3.0 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0725 your fix is 020°T, 3.8 nm from Westfield church spire. You steer 101°T at 8.4 kn through the water. At 0830 a new fix puts you 052°T, 3.8 nm from Tern Island tower.

   Plot the 0830 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0850 your fix is 262°T, 3.2 nm from Gannet Rock daybeacon. You steer 068°T at 5.2 kn through the water. At 0920 a new fix puts you 245°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 0920 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  

5. At 1325 your fix is 354°T, 2.1 nm from Mill stack. You steer 049°T at 5.0 kn through the water. At 1425 a new fix puts you 043°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1425 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  

6. At 1015 your fix is 217°T, 1.4 nm from Gannet Rock daybeacon. You steer 278°T at 5.3 kn through the water. At 1110 a new fix puts you 106°T, 1.9 nm from Heron Point Light.

   Plot the 1110 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 1405 your fix is 319°T, 1.8 nm from Tern Island tower. You steer 204°T at 7.1 kn through the water. At 1435 a new fix puts you 055°T, 3.3 nm from Heron Point Light.

   Plot the 1435 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 1220 your fix is 330°T, 2.8 nm from Kittle water tank. You steer 243°T at 4.2 kn through the water. At 1320 a new fix puts you 358°T, 2.5 nm from Mill stack.

   Plot the 1320 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