: Use a sextant to "shoot" the sun, moon, or stars while simultaneously recording the exact time from your chronometer.

: Estimate your current location based on your last known fix, speed, and heading.

: Draw Lines of Position (LOPs) on a plotting sheet . The point where multiple lines intersect is your actual position. 📱 Modern Alternatives Charles Vaillancourt - Facebook

: A publication containing the predicted positions of celestial bodies throughout the year.

: The primary instrument used to measure the angle between the horizon and a celestial body.