Worksheet 9 · Skill 5

Set and drift

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1. At 0940 your fix is 226°T, 1.6 nm from Gannet Rock daybeacon. You steer 246°T at 6.5 kn through the water. At 1010 a new fix puts you 318°T, 1.6 nm from Mill stack.

   Plot the 1010 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 1345 your fix is 328°T, 1.6 nm from Kittle water tank. You steer 013°T at 6.7 kn through the water. At 1435 a new fix puts you 048°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1435 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  

3. At 1415 your fix is 354°T, 1.8 nm from Heron Point Light. You steer 076°T at 8.8 kn through the water. At 1450 a new fix puts you 207°T, 2.3 nm from Tern Island tower.

   Plot the 1450 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  

4. At 1410 your fix is 328°T, 2.7 nm from Kittle water tank. You steer 260°T at 5.7 kn through the water. At 1445 a new fix puts you 026°T, 2.7 nm from Mill stack.

   Plot the 1445 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  

5. At 1200 your fix is 059°T, 2.8 nm from Gannet Rock daybeacon. You steer 206°T at 8.3 kn through the water. At 1230 a new fix puts you 176°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1230 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 1325 your fix is 226°T, 1.3 nm from Tern Island tower. You steer 157°T at 4.1 kn through the water. At 1400 a new fix puts you 234°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1400 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 1205 your fix is 288°T, 2.3 nm from Tern Island tower. You steer 176°T at 4.6 kn through the water. At 1320 a new fix puts you 050°T, 2.6 nm from Mill stack.

   Plot the 1320 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  

8. At 1150 your fix is 092°T, 2.1 nm from Tern Island tower. You steer 233°T at 6.0 kn through the water. At 1250 a new fix puts you 325°T, 1.0 nm from Mill stack.

   Plot the 1250 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