Small boat navigation is more than just knowing the techniques, it's being able to apply them correctly in challenging conditions. Things happen fast in a small boat, and sea action can knock it around. To make matters worse, the chart table is likely to be a small space on the console. In these conditions, anything that can simplify navigation tasks will make your job easier. In this course you learned how to correct compass errors and how to convert relative bearings to true. Simple math, but a lot of rules and opportunities for mistakes. Navigation Aid's Course Conversion Calculator is designed to perform these tasks for you with just a spin of the wheel. It's a very simple device that's easy to use and needs no batteries. Made of durable plastic, it has 2 rotating compass cards with index marks, and a rectangular relative bearing indicator. By rotating the various components, true and compass courses can be obtained, as well as true bearings from relative. I'm not a big fan of circular slide rules. I've used the ones that compute Time/Speed/Distance and I'm not convinced that they're any easier than doing the math. The Course Conversion Calculator is different, though. I've used it for real world navigation and found it to be accurate, easy to use, and it fits nicely in the back of my log book. It comes with complete instructions and printed on the back is a short refresher on plotting Set and Drift. Price is $24.95 and it's available from Navigation Aid. Click here for a Video Demonstration of the Calculator Comments or questions can be directed to Navigation Aid.Copyright © 2008