Question 30 Can do it graphically on your chart or on a piece of paper, or can do it using table 15.1 of the piloting notes. I find graphing easiest myself. Tr025 Draw a track of 025 Draw drift and speed to scale Rotate the speed vector about the end of the drift vector to see where it intersects the track and this is your true course… C033 S6.0 SET 330 DFT 1.0 Table 15.1 : set/C=1/6=0.17, tr-set= =-305 Gives: 8 and 1.1, so 025+8= 033, SOA= 1.1S=6.6 Mike Buchko Q30

Question 30 Plotted by T. Harding Saskatchewan Power and Sail Squadron Q30 Current vector 1 unit in length Course vector 6 units in length Rotate the 6 unit long vector about the end of the current vector until it intersects the red Track line. Then measure the direction of your Green course line to determine the Course (which happens to be 033 in this example). Remember that the units can be anything you like, inches, centimeters, etc. The only thing that matters is that the lengths must be proportional to the current and Boat speeds…

Question 31 Plotted by T. Harding Saskatchewan Power and Sail Squadron Q31 1 st Bearing 2 nd Bearing =12’ D=ST/60=6x12/60 Distance=1.2nM It is kind of painful to explain so just watch how the line moves and you’ll get the idea. Remember the DR positions you plot on the course line are based entirely on using your 6.0 Knot boat speed (S) and the calculated distance from your last fix (D=ST/60) and have nothing to do with where the bearings actually intersect your course line… 1.2 nM

General overview midday of day 3 of the cruise Plotted by T. Harding Saskatchewan Power and Sail Squadron Q31

Question 32 Plotted by T. Harding Saskatchewan Power and Sail Squadron Q32 At 11:05 we extend our course line…(033) At 11:52 we get an RFIX and extend a new =Course line and change it as we proceed and eventually get a fix at 1330 Now we have to go back to our 11:05 FIX courseline and extend it up to 13:30 essentially duplicating the DR plotting that we did on the course line that extended from the 11:52 RFIX

Question 32 In order to determine our 1330 Set and Drift, remember to go back and advance the DR's from your last fix which was at 1105 and NOT the 1152 RFIX Plotted by T. Harding Saskatchewan Power and Sail Squadron Q32

Question 32 Advanced from the 1105 FIX Advanced from the 1152 RFIX, Don’t use this for the Set and Drift calculation Plotted by T. Harding Saskatchewan Power and Sail Squadron Q32

Question 33 Plotted by T. Harding Saskatchewan Power and Sail Squadron Q33

Mike Buchko Acknowledgements: I think Terry Harding deserves a big round of applause, it took me a fair bit of time just to cut and paste his stuff into this powerpoint, so I am sure Terry spent a tremendous amount of time and effort actually plotting the stuff up and thinking about the best way to do it.. Thanks for the effort Terry. The End