The exact steps that you need to take to adjust your car compass will depend on the make and model of the compass. Refer to the manufacturer’s guide to ensure that you take the right steps for your specific compass. The principle behind the adjustments is the same with all compasses; to ensure that they read accurately within their given environment. If you have chosen a Ritchie car compass, then making these adjustments is simple. Find the two adjusting rods with slotted ends Place the compass in its intended position but do not fix in place. Select a course using two easily identifiable landmarks that are within 10 degrees of the North/South line Keep the marks lined up and move along the selected course. Move the compensators until the compass reads correctly. Reverse away from the marks, keeping the points lined up. If there is a discrepancy this time, move the compass itself until it is aligned. Repeat these steps until any discrepancy is removed and then fix the compass in place in its final position.