Worksheet 389 · Skill 5

Set and drift

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1. At 1110 your fix is 219°T, 1.5 nm from Gannet Rock daybeacon. You steer 305°T at 5.4 kn through the water. At 1140 a new fix puts you 238°T, 1.9 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1440 your fix is 074°T, 2.0 nm from Heron Point Light. You steer 068°T at 6.5 kn through the water. At 1530 a new fix puts you 152°T, 2.6 nm from Tern Island tower.

   Plot the 1530 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 0730 your fix is 006°T, 1.9 nm from Gannet Rock daybeacon. You steer 227°T at 6.9 kn through the water. At 0810 a new fix puts you 018°T, 2.5 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1150 your fix is 109°T, 1.4 nm from Westfield church spire. You steer 108°T at 7.4 kn through the water. At 1225 a new fix puts you 000°T, 2.3 nm from Mill stack.

   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 1350 your fix is 356°T, 1.6 nm from Mill stack. You steer 346°T at 6.8 kn through the water. At 1425 a new fix puts you 249°T, 2.9 nm from Tern Island tower.

   Plot the 1425 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 0840 your fix is 234°T, 2.5 nm from Gannet Rock daybeacon. You steer 322°T at 4.2 kn through the water. At 0940 a new fix puts you 262°T, 2.3 nm from Tern Island tower.

   Plot the 0940 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 1010 your fix is 089°T, 2.3 nm from Tern Island tower. You steer 146°T at 7.0 kn through the water. At 1045 a new fix puts you 098°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1045 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  

8. At 1410 your fix is 079°T, 2.5 nm from Gannet Rock daybeacon. You steer 211°T at 4.1 kn through the water. At 1445 a new fix puts you 328°T, 1.1 nm from Kittle water tank.

   Plot the 1445 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