Worksheet 588 · Skill 5

Set and drift

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1. At 0920 your fix is 203°T, 1.3 nm from Tern Island tower. You steer 288°T at 5.9 kn through the water. At 1035 a new fix puts you 042°T, 2.4 nm from Westfield church spire.

   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  

2. At 1005 your fix is 324°T, 2.7 nm from Tern Island tower. You steer 091°T at 5.4 kn through the water. At 1115 a new fix puts you 060°T, 5.0 nm from Tern Island tower.

   Plot the 1115 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  

3. At 1505 your fix is 024°T, 1.2 nm from Gannet Rock daybeacon. You steer 238°T at 4.1 kn through the water. At 1635 a new fix puts you 096°T, 2.9 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1410 your fix is 013°T, 2.0 nm from Heron Point Light. You steer 082°T at 8.3 kn through the water. At 1510 a new fix puts you 132°T, 2.8 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1055 your fix is 018°T, 1.1 nm from Heron Point Light. You steer 072°T at 7.5 kn through the water. At 1155 a new fix puts you 049°T, 1.4 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1115 your fix is 256°T, 2.8 nm from Gannet Rock daybeacon. You steer 138°T at 4.1 kn through the water. At 1145 a new fix puts you 240°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1145 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 0910 your fix is 023°T, 2.0 nm from Heron Point Light. You steer 114°T at 6.5 kn through the water. At 0945 a new fix puts you 044°T, 1.9 nm from Mill stack.

   Plot the 0945 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 1150 your fix is 257°T, 2.4 nm from Tern Island tower. You steer 209°T at 5.3 kn through the water. At 1220 a new fix puts you 069°T, 2.3 nm from Heron Point Light.

   Plot the 1220 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