Maritime Navigation Suite

Professional celestial navigation, cargo calculations, and voyage planning tools for maritime professionals

Ship Position
Enter current ship position for celestial calculations
Gyro Compass Error Calculation
Calculate gyro error using celestial bearing observations

Click calculator to auto-calculate true bearing

Gyro Error Result

0.0°

Westerly Error

Observed: °

True: °

Error = Observed - True

Magnetic Compass Error Calculation
Calculate magnetic compass error (Variation + Deviation)

Magnetic Compass Results

Deviation

0.0°

Total Compass Error

0.0°

Variation: °

Deviation: 0.0°

Error = Variation + Deviation

Real-Time Celestial Data
Current positions for Sun, Moon, and planets - Updated: Thu, 28 Aug 2025 13:15:02 GMT

Sun

GHA:

Dec:

SD: 16.0'

Live Data

Moon

GHA:

Dec:

SD: 15.2'

Live Data

Planets

Venus: Mag -4.2

Jupiter: Mag -2.1

Mars: Mag 0.8

Available
Navigation Stars Catalog
Complete catalog of 57 navigation stars with SHA, Declination, and Magnitude
Star NameSHADeclinationMagnitude
Acamar315°16.8'S40°18.2'2.9
Achernar335°25.5'S57°09.7'0.5
Acrux173°07.2'S63°10.9'0.8
Adhara255°11.1'S28°59.9'1.5
Aldebaran290°47.3'N16°30.9'0.9
Alioth166°19.4'N55°57.1'1.8
Alkaid152°57.8'N49°18.8'1.9
Al Na'ir27°41.9'S46°53.1'1.7
Alnilam275°44.3'S01°12.0'1.7
Alphard217°54.1'S08°39.8'2
Alphecca126°09.9'N26°42.0'2.2
Alpheratz357°41.7'N29°05.4'2.1
Altair62°06.9'N08°52.1'0.8
Ankaa353°14.1'S42°18.4'2.4
Antares112°24.4'S26°27.9'1
Arcturus145°54.2'N19°10.9'0
Atria107°25.2'S69°03.0'1.9
Avior234°16.6'S59°33.7'1.9
Bellatrix278°30.2'N06°20.9'1.6
Betelgeuse270°59.1'N07°24.4'0.5
Canopus263°54.8'S52°42.0'-0.7
Capella280°31.8'N45°59.9'0.1
Deneb49°30.2'N45°16.9'1.3
Denebola182°31.8'N14°28.9'2.1
Diphda348°54.2'S17°59.1'2
Dubhe193°49.8'N61°39.5'1.8
Elnath278°10.4'N28°36.3'1.7
Eltanin90°45.9'N51°29.3'2.2
Enif33°45.7'N09°52.9'2.4
Fomalhaut15°22.4'S29°37.3'1.2
Gacrux171°58.8'S57°06.8'1.6
Gienah175°50.4'S17°32.3'2.6
Hadar148°45.5'S60°26.6'0.6
Hamal327°58.7'N23°27.1'2
Kaus Australis83°41.8'S34°22.4'1.8
Kochab137°21.0'N74°09.2'2.1
Markab13°36.7'N15°12.3'2.5
Menkar314°13.2'N04°05.2'2.5
Menkent148°05.6'S36°26.6'2.1
Miaplacidus221°38.4'S69°46.9'1.7
Mirfak308°37.4'N49°51.8'1.8
Nunki75°56.2'S26°16.4'2
Peacock53°16.8'S56°44.1'1.9
Polaris319°21.7'N89°20.1'2
Pollux243°25.2'N27°59.0'1.1
Procyon244°57.5'N05°10.9'0.4
Rasalhague96°05.2'N12°33.1'2.1
Regulus207°41.4'N11°57.1'1.4
Rigel281°10.1'S08°12.1'0.1
Rigil Kent139°49.6'S60°50.2'-0.3
Sabik102°10.9'S15°44.4'2.4
Schedar349°38.6'N56°32.0'2.2
Shaula96°20.0'S37°06.6'1.6
Sirius258°31.8'S16°44.3'-1.5
Spica158°29.5'S11°14.5'1
Suhail222°50.7'S43°29.8'2.2
Vega80°38.0'N38°48.1'0
Zubenelgenubi137°03.7'S16°06.3'2.8
Showing 58 of 58 navigation stars