Step 1: We'll use a universal plotting sheet to work out our current vectors. The plotting sheet is marked with units for distance and angle. We'll use it to draw vectors, lines that represent both angle and distance. To solve problems for tidal current, the trick is to create a plot based on one hour of travel. That way our speed (knots) equals our distance (miles), and the length of each vector directly represents our speed. In this problem, we're steering a course of 020 true and making 5 knots through the water. Using dividers with a pencil tip on one end, measure off 5 miles on the distance scale and make an arc near our course. Next, using the compass rose, line up parallel rules from the plotting sheet's center mark through the 020 mark on the compass rose. Draw a line from the center to our pencil arc; this vector represents our course and boat speed. Above the line, label it "C 020 T." The "C" reminds us that this is our course, uncorrected for current; the "T" reminds us that this is a true course, corrected for compass error. Below the line, label it "S 5.0"; the "S" reminds us that this is our boat speed (through the water, not over the ground).