Worksheet 865 · Skill 5

Set and drift

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1. At 1435 your fix is 300°T, 2.4 nm from Tern Island tower. You steer 163°T at 8.3 kn through the water. At 1510 a new fix puts you 028°T, 2.5 nm from Mill stack.

   Plot the 1510 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  

2. At 0945 your fix is 013°T, 1.4 nm from Gannet Rock daybeacon. You steer 248°T at 5.7 kn through the water. At 1025 a new fix puts you 264°T, 2.9 nm from Gannet Rock daybeacon.

   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  

3. At 1415 your fix is 340°T, 2.1 nm from Mill stack. You steer 324°T at 4.1 kn through the water. At 1500 a new fix puts you 031°T, 3.1 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0715 your fix is 248°T, 1.7 nm from Gannet Rock daybeacon. You steer 306°T at 8.5 kn through the water. At 0815 a new fix puts you 044°T, 3.2 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1250 your fix is 062°T, 2.1 nm from Heron Point Light. You steer 093°T at 5.7 kn through the water. At 1420 a new fix puts you 326°T, 3.0 nm from Kittle water tank.

   Plot the 1420 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  

6. At 1015 your fix is 017°T, 2.6 nm from Heron Point Light. You steer 106°T at 6.1 kn through the water. At 1110 a new fix puts you 207°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1110 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  

7. At 1030 your fix is 235°T, 3.5 nm from Tern Island tower. You steer 344°T at 4.1 kn through the water. At 1120 a new fix puts you 063°T, 2.6 nm from Westfield church spire.

   Plot the 1120 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 0920 your fix is 099°T, 1.6 nm from Westfield church spire. You steer 105°T at 4.3 kn through the water. At 1035 a new fix puts you 180°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1035 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