Worksheet 470 · Skill 5

Set and drift

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1. At 0825 your fix is 023°T, 3.8 nm from Westfield church spire. You steer 136°T at 8.2 kn through the water. At 0935 a new fix puts you 062°T, 2.6 nm from Mill stack.

   Plot the 0935 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1350 your fix is 341°T, 1.7 nm from Mill stack. You steer 016°T at 5.5 kn through the water. At 1435 a new fix puts you 227°T, 2.8 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1030 your fix is 030°T, 2.4 nm from Mill stack. You steer 291°T at 4.9 kn through the water. At 1110 a new fix puts you 085°T, 1.2 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1515 your fix is 003°T, 2.2 nm from Westfield church spire. You steer 144°T at 4.2 kn through the water. At 1625 a new fix puts you 082°T, 2.3 nm from Heron Point Light.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1055 your fix is 297°T, 2.3 nm from Tern Island tower. You steer 251°T at 7.6 kn through the water. At 1125 a new fix puts you 090°T, 1.2 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0845 your fix is 246°T, 2.7 nm from Gannet Rock daybeacon. You steer 050°T at 6.8 kn through the water. At 0920 a new fix puts you 022°T, 2.2 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1005 your fix is 032°T, 3.2 nm from Heron Point Light. You steer 133°T at 4.7 kn through the water. At 1040 a new fix puts you 003°T, 3.3 nm from Mill stack.

   Plot the 1040 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 1255 your fix is 272°T, 1.8 nm from Gannet Rock daybeacon. You steer 270°T at 7.8 kn through the water. At 1330 a new fix puts you 023°T, 3.0 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn