Worksheet 567 · Skill 5

Set and drift

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1. At 1340 your fix is 074°T, 1.7 nm from Tern Island tower. You steer 161°T at 4.0 kn through the water. At 1430 a new fix puts you 020°T, 1.5 nm from Kittle water tank.

   Plot the 1430 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  

2. At 0825 your fix is 108°T, 2.2 nm from Gannet Rock daybeacon. You steer 250°T at 4.8 kn through the water. At 0915 a new fix puts you 021°T, 2.8 nm from Mill stack.

   Plot the 0915 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  

3. At 1115 your fix is 007°T, 2.2 nm from Mill stack. You steer 328°T at 7.9 kn through the water. At 1150 a new fix puts you 062°T, 2.4 nm from Westfield church spire.

   Plot the 1150 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  

4. At 1240 your fix is 258°T, 2.3 nm from Tern Island tower. You steer 178°T at 6.8 kn through the water. At 1310 a new fix puts you 003°T, 3.0 nm from Mill stack.

   Plot the 1310 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 0810 your fix is 015°T, 2.4 nm from Gannet Rock daybeacon. You steer 150°T at 6.6 kn through the water. At 0845 a new fix puts you 018°T, 1.9 nm from Kittle water tank.

   Plot the 0845 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  

6. At 1015 your fix is 217°T, 0.8 nm from Gannet Rock daybeacon. You steer 279°T at 4.6 kn through the water. At 1110 a new fix puts you 043°T, 3.5 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 1255 your fix is 047°T, 2.6 nm from Tern Island tower. You steer 161°T at 5.1 kn through the water. At 1410 a new fix puts you 100°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1410 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0905 your fix is 001°T, 1.4 nm from Kittle water tank. You steer 277°T at 5.3 kn through the water. At 0955 a new fix puts you 202°T, 2.7 nm from Tern Island tower.

   Plot the 0955 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