Worksheet 256 · Skill 5

Set and drift

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1. At 0910 your fix is 035°T, 1.4 nm from Westfield church spire. You steer 156°T at 4.0 kn through the water. At 1025 a new fix puts you 355°T, 3.1 nm from Mill stack.

   Plot the 1025 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  

2. At 1600 your fix is 030°T, 2.3 nm from Tern Island tower. You steer 258°T at 4.2 kn through the water. At 1705 a new fix puts you 068°T, 2.6 nm from Westfield church spire.

   Plot the 1705 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  

3. At 1345 your fix is 117°T, 1.6 nm from Gannet Rock daybeacon. You steer 022°T at 5.5 kn through the water. At 1415 a new fix puts you 061°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1415 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 1140 your fix is 039°T, 2.6 nm from Mill stack. You steer 090°T at 6.3 kn through the water. At 1210 a new fix puts you 015°T, 1.9 nm from Kittle water tank.

   Plot the 1210 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 1230 your fix is 025°T, 2.9 nm from Gannet Rock daybeacon. You steer 047°T at 4.0 kn through the water. At 1300 a new fix puts you 059°T, 4.5 nm from Tern Island tower.

   Plot the 1300 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 1435 your fix is 309°T, 1.4 nm from Tern Island tower. You steer 073°T at 4.7 kn through the water. At 1505 a new fix puts you 029°T, 1.4 nm from Tern Island tower.

   Plot the 1505 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  

7. At 0955 your fix is 040°T, 2.0 nm from Kittle water tank. You steer 001°T at 5.5 kn through the water. At 1040 a new fix puts you 048°T, 3.5 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0945 your fix is 042°T, 3.6 nm from Gannet Rock daybeacon. You steer 230°T at 4.8 kn through the water. At 1025 a new fix puts you 133°T, 2.9 nm from Tern Island tower.

   Plot the 1025 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