Worksheet 544 · Skill 5

Set and drift

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1. At 1040 your fix is 323°T, 3.0 nm from Tern Island tower. You steer 103°T at 5.6 kn through the water. At 1130 a new fix puts you 044°T, 3.1 nm from Gannet Rock daybeacon.

   Plot the 1130 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 1205 your fix is 223°T, 2.1 nm from Tern Island tower. You steer 183°T at 4.1 kn through the water. At 1250 a new fix puts you 035°T, 1.1 nm from Mill stack.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1340 your fix is 343°T, 1.5 nm from Gannet Rock daybeacon. You steer 248°T at 4.9 kn through the water. At 1430 a new fix puts you 238°T, 2.5 nm from Tern Island tower.

   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  

4. At 1150 your fix is 016°T, 2.6 nm from Westfield church spire. You steer 119°T at 4.6 kn through the water. At 1225 a new fix puts you 088°T, 3.2 nm from Westfield church spire.

   Plot the 1225 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  

5. At 1520 your fix is 041°T, 1.4 nm from Kittle water tank. You steer 326°T at 6.3 kn through the water. At 1555 a new fix puts you 135°T, 2.5 nm from Tern Island tower.

   Plot the 1555 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 1200 your fix is 278°T, 3.8 nm from Tern Island tower. You steer 260°T at 4.0 kn through the water. At 1240 a new fix puts you 039°T, 2.1 nm from Westfield church spire.

   Plot the 1240 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  

7. At 0745 your fix is 265°T, 1.5 nm from Gannet Rock daybeacon. You steer 053°T at 4.4 kn through the water. At 0825 a new fix puts you 088°T, 1.7 nm from Tern Island tower.

   Plot the 0825 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  

8. At 1010 your fix is 185°T, 1.6 nm from Tern Island tower. You steer 296°T at 7.9 kn through the water. At 1105 a new fix puts you 015°T, 3.8 nm from Westfield church spire.

   Plot the 1105 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