Worksheet 538 · Skill 5

Set and drift

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1. At 1510 your fix is 038°T, 2.7 nm from Heron Point Light. You steer 311°T at 4.7 kn through the water. At 1550 a new fix puts you 008°T, 1.4 nm from Westfield church spire.

   Plot the 1550 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 0705 your fix is 157°T, 1.8 nm from Westfield church spire. You steer 049°T at 8.9 kn through the water. At 0750 a new fix puts you 324°T, 2.4 nm from Tern Island tower.

   Plot the 0750 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  

3. At 1320 your fix is 294°T, 3.3 nm from Tern Island tower. You steer 196°T at 4.9 kn through the water. At 1410 a new fix puts you 070°T, 2.1 nm from Heron Point Light.

   Plot the 1410 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  

4. At 1110 your fix is 094°T, 2.8 nm from Westfield church spire. You steer 046°T at 6.0 kn through the water. At 1205 a new fix puts you 316°T, 2.1 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0830 your fix is 205°T, 2.3 nm from Tern Island tower. You steer 308°T at 4.0 kn through the water. At 0920 a new fix puts you 245°T, 2.2 nm from Tern Island tower.

   Plot the 0920 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  

6. At 1055 your fix is 240°T, 2.3 nm from Tern Island tower. You steer 151°T at 5.1 kn through the water. At 1130 a new fix puts you 252°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1130 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  

7. At 1255 your fix is 020°T, 2.7 nm from Mill stack. You steer 324°T at 7.3 kn through the water. At 1340 a new fix puts you 289°T, 2.7 nm from Tern Island tower.

   Plot the 1340 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 0915 your fix is 226°T, 1.4 nm from Gannet Rock daybeacon. You steer 082°T at 4.7 kn through the water. At 1000 a new fix puts you 051°T, 2.4 nm from Kittle water tank.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn