Davis Instruments 126 Coastwise Piloting Card - Quick Reference GuideThe Davis Instruments 126 Coastwise Piloting Card is the perfect quick reference guide for all your piloting needs. This handy card provides all the information you need at your fingertips, including dead reckoning basics, true and magnetic compass relationships, position finding, estimating distance off, and current and leeway corrections. It also includes helpful hints on chart reading, preparations, checklists, fog navigation, and depth soundings without a fathometer. The card even features a time, distance & speed calculator, a relative bearing gauge for length-off calculations, and common chart symbols.Features: Plastic construction for durability and longevity Waterproof design to withstand harsh marine environments Specifications: Dimensions: 5" x 7" Weight: 0.5 oz Material: Plastic Waterproof: Yes Learn MoreFor more information on coastwise piloting, check out these Wikipedia articles: Coastwise Navigation onclick="window.open(this.href, 'popup', 'height=600,width=800'); return false;" Dead Reckoning onclick="window.open(this.href, 'popup', 'height=600,width=800'); return false;" Compass onclick="window.open(this.href, 'popup', 'height=600,width=800'); return false;" Position Fixing onclick="window.open(this.href, 'popup', 'height=600,width=800'); return false;" Fathometer onclick="window.open(this.href, 'popup', 'height=600,width=800'); return false;"