Worksheet 20 · Skill 5

Set and drift

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1. At 1000 your fix is 026°T, 2.1 nm from Kittle water tank. You steer 001°T at 7.4 kn through the water. At 1030 a new fix puts you 027°T, 3.2 nm from Gannet Rock daybeacon.

   Plot the 1030 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 1535 your fix is 021°T, 3.0 nm from Westfield church spire. You steer 121°T at 6.5 kn through the water. At 1635 a new fix puts you 277°T, 2.1 nm from Tern Island tower.

   Plot the 1635 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  

3. At 0700 your fix is 345°T, 1.7 nm from Tern Island tower. You steer 082°T at 5.7 kn through the water. At 0745 a new fix puts you 076°T, 3.4 nm from Tern Island tower.

   Plot the 0745 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  

4. At 1400 your fix is 036°T, 3.3 nm from Gannet Rock daybeacon. You steer 248°T at 5.8 kn through the water. At 1500 a new fix puts you 207°T, 3.1 nm from Tern Island tower.

   Plot the 1500 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  

5. At 1005 your fix is 221°T, 3.1 nm from Tern Island tower. You steer 004°T at 6.1 kn through the water. At 1040 a new fix puts you 262°T, 1.4 nm from Tern Island tower.

   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  

6. At 1150 your fix is 283°T, 2.5 nm from Tern Island tower. You steer 223°T at 5.1 kn through the water. At 1250 a new fix puts you 090°T, 2.4 nm from Westfield church spire.

   Plot the 1250 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  

7. At 1040 your fix is 332°T, 1.9 nm from Tern Island tower. You steer 192°T at 4.9 kn through the water. At 1155 a new fix puts you 345°T, 2.5 nm from Mill stack.

   Plot the 1155 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 1200 your fix is 016°T, 1.5 nm from Gannet Rock daybeacon. You steer 250°T at 7.7 kn through the water. At 1250 a new fix puts you 144°T, 3.2 nm from Westfield church spire.

   Plot the 1250 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