Worksheet 729 · Skill 5

Set and drift

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1. At 1325 your fix is 005°T, 1.8 nm from Kittle water tank. You steer 004°T at 4.6 kn through the water. At 1420 a new fix puts you 083°T, 2.9 nm from Tern Island tower.

   Plot the 1420 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  

2. At 1010 your fix is 047°T, 3.5 nm from Gannet Rock daybeacon. You steer 246°T at 8.6 kn through the water. At 1105 a new fix puts you 002°T, 2.1 nm from Mill stack.

   Plot the 1105 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  

3. At 1200 your fix is 061°T, 2.7 nm from Westfield church spire. You steer 092°T at 6.0 kn through the water. At 1235 a new fix puts you 274°T, 2.0 nm from Tern Island tower.

   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  

4. At 1045 your fix is 076°T, 2.3 nm from Heron Point Light. You steer 025°T at 5.4 kn through the water. At 1130 a new fix puts you 233°T, 1.9 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1330 your fix is 291°T, 2.3 nm from Tern Island tower. You steer 221°T at 5.0 kn through the water. At 1420 a new fix puts you 068°T, 2.3 nm from Heron Point Light.

   Plot the 1420 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 1230 your fix is 328°T, 2.1 nm from Mill stack. You steer 049°T at 6.2 kn through the water. At 1320 a new fix puts you 199°T, 1.3 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0810 your fix is 018°T, 3.5 nm from Westfield church spire. You steer 157°T at 7.7 kn through the water. At 0900 a new fix puts you 041°T, 1.9 nm from Heron Point Light.

   Plot the 0900 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 0955 your fix is 111°T, 2.2 nm from Westfield church spire. You steer 119°T at 8.9 kn through the water. At 1040 a new fix puts you 234°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1040 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