Worksheet 827 · Skill 5

Set and drift

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1. At 0740 your fix is 156°T, 3.1 nm from Tern Island tower. You steer 280°T at 7.4 kn through the water. At 0835 a new fix puts you 100°T, 2.9 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1035 your fix is 041°T, 2.6 nm from Gannet Rock daybeacon. You steer 329°T at 4.9 kn through the water. At 1110 a new fix puts you 034°T, 3.1 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0735 your fix is 067°T, 4.4 nm from Tern Island tower. You steer 213°T at 6.0 kn through the water. At 0805 a new fix puts you 038°T, 2.4 nm from Gannet Rock daybeacon.

   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  

4. At 1150 your fix is 057°T, 3.3 nm from Tern Island tower. You steer 176°T at 5.1 kn through the water. At 1255 a new fix puts you 142°T, 1.0 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1320 your fix is 322°T, 3.0 nm from Kittle water tank. You steer 261°T at 4.6 kn through the water. At 1420 a new fix puts you 075°T, 1.2 nm from Heron Point Light.

   Plot the 1420 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 1250 your fix is 085°T, 2.4 nm from Westfield church spire. You steer 053°T at 6.6 kn through the water. At 1340 a new fix puts you 346°T, 1.6 nm from Tern Island tower.

   Plot the 1340 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  

7. At 1240 your fix is 226°T, 1.6 nm from Gannet Rock daybeacon. You steer 318°T at 6.3 kn through the water. At 1330 a new fix puts you 084°T, 3.5 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1110 your fix is 314°T, 3.0 nm from Tern Island tower. You steer 165°T at 4.3 kn through the water. At 1220 a new fix puts you 047°T, 2.9 nm from Heron Point Light.

   Plot the 1220 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