Reeds Skippers Handbook
This concise little book (just 4in X 6in) is one of those handy aids to keep in the chart table. It is clearly laid out with each section having different colors. It covers basic navigation, weather, buoyage, sail trim, ColRegs (including the CEVNI rules) among other things.
Published by Adlard Coles Nautical, ISBN 9781408124772, 6th Ed. 2010