Features:

• 5" x 5" square.
• Can be used on all scales of charts or maps based on true north, and even on folded charts with no compass rose visible.
• Two-color degree markings (black clockwise, red counter-clockwise). Ruler edges highlighted in red.
• Use on small navigation tables, aircraft cockpit or even on your lap.
• Find a course, plot a bearing, course or line of position, plot a reciprocal course, determine direction course or bearing, transfer a course or bearing, plot position from 2 or 3 bearings or from horizontal sextant angles.
• Vinyl case and instructions included.
• Also includes Time-Speed-Distance Ruler.