Worksheet 712 · Skill 5

Set and drift

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1. At 1050 your fix is 212°T, 1.4 nm from Tern Island tower. You steer 284°T at 4.1 kn through the water. At 1150 a new fix puts you 037°T, 3.4 nm from Heron Point Light.

   Plot the 1150 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  

2. At 1335 your fix is 270°T, 3.0 nm from Tern Island tower. You steer 206°T at 7.4 kn through the water. At 1410 a new fix puts you 036°T, 1.1 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1410 your fix is 092°T, 1.8 nm from Westfield church spire. You steer 066°T at 6.0 kn through the water. At 1510 a new fix puts you 319°T, 2.7 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  

4. At 0955 your fix is 018°T, 2.3 nm from Gannet Rock daybeacon. You steer 322°T at 4.1 kn through the water. At 1035 a new fix puts you 002°T, 2.1 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1310 your fix is 357°T, 1.7 nm from Kittle water tank. You steer 277°T at 4.1 kn through the water. At 1430 a new fix puts you 239°T, 1.5 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1500 your fix is 061°T, 3.6 nm from Westfield church spire. You steer 184°T at 6.0 kn through the water. At 1535 a new fix puts you 026°T, 2.2 nm from Heron Point Light.

   Plot the 1535 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 1110 your fix is 066°T, 2.6 nm from Westfield church spire. You steer 144°T at 5.9 kn through the water. At 1205 a new fix puts you 076°T, 2.6 nm from Heron Point Light.

   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  

8. At 1045 your fix is 127°T, 1.5 nm from Tern Island tower. You steer 093°T at 6.5 kn through the water. At 1120 a new fix puts you 056°T, 3.2 nm from Gannet Rock daybeacon.

   Plot the 1120 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