Worksheet 917 · Skill 5

Set and drift

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1. At 1100 your fix is 218°T, 2.8 nm from Tern Island tower. You steer 335°T at 4.3 kn through the water. At 1140 a new fix puts you 053°T, 3.7 nm from Westfield church spire.

   Plot the 1140 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  

2. At 1540 your fix is 091°T, 1.5 nm from Heron Point Light. You steer 349°T at 6.3 kn through the water. At 1635 a new fix puts you 057°T, 3.7 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1110 your fix is 031°T, 3.8 nm from Gannet Rock daybeacon. You steer 226°T at 8.7 kn through the water. At 1210 a new fix puts you 355°T, 3.4 nm from Mill stack.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0935 your fix is 075°T, 2.6 nm from Westfield church spire. You steer 114°T at 4.0 kn through the water. At 1105 a new fix puts you 336°T, 2.6 nm from Kittle water tank.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0745 your fix is 021°T, 2.4 nm from Westfield church spire. You steer 093°T at 7.5 kn through the water. At 0815 a new fix puts you 284°T, 2.7 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0940 your fix is 105°T, 1.2 nm from Westfield church spire. You steer 068°T at 5.9 kn through the water. At 1040 a new fix puts you 027°T, 2.3 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1445 your fix is 019°T, 2.1 nm from Kittle water tank. You steer 338°T at 4.1 kn through the water. At 1540 a new fix puts you 096°T, 1.8 nm from Tern Island tower.

   Plot the 1540 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  

8. At 0700 your fix is 078°T, 3.6 nm from Westfield church spire. You steer 118°T at 4.5 kn through the water. At 0810 a new fix puts you 215°T, 3.2 nm from Tern Island tower.

   Plot the 0810 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn