Worksheet 249 · Skill 5

Set and drift

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1. At 1600 your fix is 350°T, 1.5 nm from Kittle water tank. You steer 293°T at 6.5 kn through the water. At 1700 a new fix puts you 238°T, 2.4 nm from Tern Island tower.

   Plot the 1700 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  

2. At 1535 your fix is 262°T, 2.3 nm from Gannet Rock daybeacon. You steer 340°T at 8.0 kn through the water. At 1610 a new fix puts you 275°T, 2.1 nm from Tern Island tower.

   Plot the 1610 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  

3. At 0710 your fix is 052°T, 4.0 nm from Tern Island tower. You steer 257°T at 7.3 kn through the water. At 0745 a new fix puts you 014°T, 1.4 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1020 your fix is 297°T, 2.3 nm from Tern Island tower. You steer 252°T at 4.6 kn through the water. At 1100 a new fix puts you 090°T, 2.3 nm from Westfield church spire.

   Plot the 1100 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  

5. At 1520 your fix is 282°T, 3.7 nm from Tern Island tower. You steer 305°T at 6.1 kn through the water. At 1550 a new fix puts you 032°T, 3.6 nm from Westfield church spire.

   Plot the 1550 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 1325 your fix is 208°T, 1.9 nm from Tern Island tower. You steer 198°T at 4.7 kn through the water. At 1355 a new fix puts you 349°T, 2.3 nm from Mill stack.

   Plot the 1355 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 1600 your fix is 357°T, 2.5 nm from Mill stack. You steer 347°T at 4.5 kn through the water. At 1650 a new fix puts you 279°T, 2.6 nm from Tern Island tower.

   Plot the 1650 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  

8. At 1520 your fix is 264°T, 2.4 nm from Gannet Rock daybeacon. You steer 259°T at 5.1 kn through the water. At 1600 a new fix puts you 036°T, 1.8 nm from Heron Point Light.

   Plot the 1600 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