Worksheet 665 · Skill 5

Set and drift

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1. At 0940 your fix is 157°T, 1.0 nm from Gannet Rock daybeacon. You steer 109°T at 4.5 kn through the water. At 1010 a new fix puts you 105°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1010 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 1340 your fix is 042°T, 0.9 nm from Heron Point Light. You steer 073°T at 4.5 kn through the water. At 1430 a new fix puts you 250°T, 2.7 nm from Gannet Rock daybeacon.

   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  

3. At 0710 your fix is 015°T, 1.1 nm from Heron Point Light. You steer 041°T at 5.3 kn through the water. At 0755 a new fix puts you 213°T, 1.8 nm from Tern Island tower.

   Plot the 0755 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 1150 your fix is 103°T, 2.0 nm from Tern Island tower. You steer 107°T at 4.7 kn through the water. At 1225 a new fix puts you 062°T, 3.3 nm from Gannet Rock daybeacon.

   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 1050 your fix is 235°T, 2.5 nm from Tern Island tower. You steer 206°T at 4.0 kn through the water. At 1125 a new fix puts you 335°T, 2.5 nm from Mill stack.

   Plot the 1125 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 0900 your fix is 084°T, 2.2 nm from Tern Island tower. You steer 053°T at 5.8 kn through the water. At 0930 a new fix puts you 064°T, 3.7 nm from Tern Island tower.

   Plot the 0930 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 1400 your fix is 004°T, 1.0 nm from Gannet Rock daybeacon. You steer 251°T at 5.8 kn through the water. At 1505 a new fix puts you 037°T, 2.3 nm from Heron Point Light.

   Plot the 1505 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1120 your fix is 044°T, 4.3 nm from Gannet Rock daybeacon. You steer 200°T at 6.3 kn through the water. At 1155 a new fix puts you 133°T, 1.3 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn