Worksheet 284 · Skill 5

Set and drift

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1. At 1450 your fix is 069°T, 2.0 nm from Heron Point Light. You steer 100°T at 4.9 kn through the water. At 1520 a new fix puts you 344°T, 1.7 nm from Mill stack.

   Plot the 1520 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 1350 your fix is 292°T, 1.9 nm from Tern Island tower. You steer 167°T at 7.9 kn through the water. At 1425 a new fix puts you 009°T, 2.6 nm from Mill stack.

   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  

3. At 1105 your fix is 082°T, 2.5 nm from Tern Island tower. You steer 223°T at 4.8 kn through the water. At 1225 a new fix puts you 034°T, 1.9 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0705 your fix is 220°T, 1.9 nm from Tern Island tower. You steer 259°T at 8.1 kn through the water. At 0735 a new fix puts you 352°T, 1.6 nm from Heron Point Light.

   Plot the 0735 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  

5. At 1200 your fix is 327°T, 1.8 nm from Tern Island tower. You steer 235°T at 7.1 kn through the water. At 1235 a new fix puts you 096°T, 2.1 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1250 your fix is 167°T, 1.5 nm from Gannet Rock daybeacon. You steer 302°T at 4.3 kn through the water. At 1355 a new fix puts you 232°T, 2.9 nm from Tern Island tower.

   Plot the 1355 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1410 your fix is 254°T, 1.8 nm from Gannet Rock daybeacon. You steer 042°T at 4.2 kn through the water. At 1500 a new fix puts you 122°T, 1.6 nm from Tern Island tower.

   Plot the 1500 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  

8. At 1035 your fix is 216°T, 1.5 nm from Tern Island tower. You steer 288°T at 5.2 kn through the water. At 1155 a new fix puts you 018°T, 3.1 nm from Westfield church spire.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn