Sextant GHA Azimut Limbe Culmination Achernar Zn Alizés Dip Ho Fix Méridienne Crépuscule nautique Polaris Sirius Hauteur observée Traversée Erre Estime Déclinaison LHA SHA Aldébaran Canopus Capella Vega Arcturus Horizon Réfraction Semi-diamètre Intercept Sextant GHA Azimut Limbe Culmination Achernar Zn Alizés Dip Ho Fix Méridienne Crépuscule nautique Polaris Sirius Hauteur observée Traversée Erre Estime Déclinaison LHA SHA Aldébaran Canopus Capella Vega Arcturus Horizon Réfraction Semi-diamètre Intercept

The product

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What's the difference between the learning tiers?

Tier 1: one solar observation per day, threshold ±30 nm. Tier 2: two observations for an intersection fix, threshold ±15 nm. Tier 3: twilight navigation stars, threshold ±10 nm. Tier 4: Moon, planets and eclipses, threshold ±8 nm. Each tier unlocks after 7 consecutive days under the required threshold.