Worksheet 485 · Skill 5

Set and drift

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1. At 1445 your fix is 000°T, 2.1 nm from Mill stack. You steer 309°T at 4.0 kn through the water. At 1525 a new fix puts you 227°T, 3.1 nm from Tern Island tower.

   Plot the 1525 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 0715 your fix is 352°T, 1.0 nm from Heron Point Light. You steer 075°T at 8.3 kn through the water. At 0755 a new fix puts you 216°T, 1.6 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0750 your fix is 241°T, 2.7 nm from Gannet Rock daybeacon. You steer 338°T at 5.5 kn through the water. At 0820 a new fix puts you 215°T, 1.8 nm from Tern Island tower.

   Plot the 0820 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  

4. At 1020 your fix is 020°T, 2.9 nm from Westfield church spire. You steer 110°T at 4.7 kn through the water. At 1115 a new fix puts you 263°T, 3.0 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1135 your fix is 065°T, 2.3 nm from Heron Point Light. You steer 069°T at 7.8 kn through the water. At 1205 a new fix puts you 158°T, 1.3 nm from Tern Island tower.

   Plot the 1205 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 1205 your fix is 150°T, 1.5 nm from Westfield church spire. You steer 105°T at 8.4 kn through the water. At 1235 a new fix puts you 006°T, 3.0 nm from Mill stack.

   Plot the 1235 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 1240 your fix is 127°T, 1.2 nm from Gannet Rock daybeacon. You steer 274°T at 8.1 kn through the water. At 1325 a new fix puts you 051°T, 3.5 nm from Heron Point Light.

   Plot the 1325 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  

8. At 0920 your fix is 054°T, 3.4 nm from Gannet Rock daybeacon. You steer 251°T at 5.3 kn through the water. At 1000 a new fix puts you 345°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1000 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