Worksheet 488 · Skill 5

Set and drift

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1. At 1005 your fix is 331°T, 2.8 nm from Kittle water tank. You steer 113°T at 4.3 kn through the water. At 1035 a new fix puts you 045°T, 1.6 nm from Kittle water tank.

   Plot the 1035 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  

2. At 0810 your fix is 040°T, 3.7 nm from Gannet Rock daybeacon. You steer 243°T at 6.3 kn through the water. At 0850 a new fix puts you 299°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 0850 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 1345 your fix is 014°T, 1.6 nm from Westfield church spire. You steer 109°T at 8.7 kn through the water. At 1420 a new fix puts you 255°T, 3.3 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1425 your fix is 266°T, 3.4 nm from Tern Island tower. You steer 156°T at 8.0 kn through the water. At 1455 a new fix puts you 006°T, 1.9 nm from Mill stack.

   Plot the 1455 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 1150 your fix is 004°T, 2.9 nm from Mill stack. You steer 047°T at 8.0 kn through the water. At 1220 a new fix puts you 109°T, 1.8 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1450 your fix is 075°T, 3.1 nm from Westfield church spire. You steer 149°T at 4.5 kn through the water. At 1605 a new fix puts you 224°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1605 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  

7. At 0700 your fix is 034°T, 2.1 nm from Kittle water tank. You steer 327°T at 4.5 kn through the water. At 0815 a new fix puts you 090°T, 2.1 nm from Tern Island tower.

   Plot the 0815 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 1025 your fix is 309°T, 1.7 nm from Kittle water tank. You steer 025°T at 5.1 kn through the water. At 1125 a new fix puts you 056°T, 3.5 nm from Gannet Rock daybeacon.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn