Receive a daily astronomical observation computed from USNO ephemerides. Reduce it with HO 249 tables, plot your line of position, and submit your fix. The platform calculates your error in nautical miles.
Choose a passage. Receive your departure briefing with vessel parameters and your initial position.
Every day, an astronomical observation arrives by email. UTC time, observed altitude, correction data — everything you need.
Sight reduction with HO 249, AP 3270 or HO 229 tables depending on your certification. Plot your line of position. Determine your fix. On paper, like at sea.
Enter your estimated position. Compare with the actual position. Track your accuracy day after day.
Real routes, simulated observations, accuracy to prove.
Seven days from Dartmouth wharf to St. George's Harbour. Observe the Sun at meridian, reduce each line of position with HO 249, submit your position. Your delta is revealed when the 48-hour window closes — just like at sea.
Three thematic bundles to progress through a coherent learning arc. Buy the set — save on every passage.
From beginner to confirmed navigator — each tier raises the complexity of celestial bodies, the expected accuracy, and the richness of the night sky to decipher.
Create a cohort, invite your students, follow their daily progress. Sailcasted becomes the practice lab between your classroom sessions.
Sign up directly, choose your passage, receive your observations. Progress at your pace — join a cohort later if you wish.
Free signup. First observation within 24 hours. No software to install — just your HO 249 tables and a pencil.
→ START FOR FREE