Sextants – equipment for astronomical navigation

A sextant is used for astronomical navigation by measuring the angle between a celestial body – such as the sun or a star – and the horizon. Together with nautical almanacs, you can calculate your position at sea without using GPS.

At Navigasjonsbutikken Kart.no AS you will find sextants from Cassens & Plath, Celestaire and Davis Instruments, as well as accessories for navigation with sextants and training in astro-navigation.

Cassens & Plath sextants

Cassens & Plath sextants are among the world’s most precise navigation instruments and are manufactured in Germany. The instruments are used by long-distance sailors, navigation schools and maritime institutions all over the world.

Celestral sextants

Professional metal sextants used by long-distance sailors, navigation courses and maritime institutions. The Astra series is known for its high precision and solid construction.

Davis sextants

Professional metal sextants used by long-distance sailors, navigation courses and maritime institutions. The Astra series is known for its high precision and solid construction.

Astronavigation

Chronometer and precise timekeeping

For astronomical navigation, precise time is crucial. A mechanical ship’s chronometer makes it possible to determine longitude with high accuracy – a method used at sea for over two hundred years.

Mechanical ship chronometer

Wempe Manufacture Caliber 5 – designed for precision navigation at sea

kr 337,500

Artificial horizon and observation equipment

Auxiliary equipment for sextant observations when the natural horizon is not visible.

Optics and observation accessories

Optical aids and accessories for observation in astronomical navigation.

Spare parts

Spare parts for sextants and navigation instruments – contact us for availability and selection.

Storage and transportation

Cases and accessories for safe storage and transportation of sextants.

Books and navigation tables

Books, star charts and navigation tables used together with sextant for astronomical navigation.

What is a sextant used for?

A sextant is a classic navigational instrument used to measure the angle between a celestial body and the horizon. With the help of nautical almanacs and navigation tables, latitude and longitude can be calculated without the use of electronic aids.

Astronomical navigation is still used by many long-distance sailors as a backup to GPS, and is also an important part of teaching classical navigation.

Whole Horizon or Split Horizon?

Hexagons are usually supplied with two types of horizon mirrors.

The Whole Horizon Mirror makes it easier to see the horizon and is often used by beginners and courses.
Split Horizon Mirror is the traditional solution where the horizon is seen directly through the mirror and is preferred by many experienced navigators.

Sextants at Navigasjonsbutikken Kart.no

The navigation shop Kart.no AS carries sextants and accessories for astronomical navigation from manufacturers such as Celestaire and Davis Instruments. The range includes training sextants, professional metal sextants and equipment for sextant navigation at sea.

Sextants – equipment for astronomical navigation

Cassens & Plath sextants

Cassens & Plath CP Sailing Sextant – Split View – marin sekstant for astronomisk navigasjon

Cassens & Plath Professional Sextant – Split View – marin sekstant for astronomisk navigasjon

Cassens & Plath Professional Sextant – Split View Illuminated – marin sekstant for astronomisk navigasjon

Cassens & Plath Professional Sextant – Full View – marin sekstant for astronomisk navigasjon

Cassens & Plath Professional Sextant – Full View Illuminated – marin sekstant for astronomisk navigasjon

Cassens & Plath Professional Sextant – Free View Illuminated – marin sekstant for astronomisk navigasjon

Cassens & Plath Bobby Schenk Astro Classic Sextant – marin sekstant for astronomisk navigasjon

Cassens & Plath Bobby Schenk Sextant – Black – marin sekstant for astronomisk navigasjon

Cassens & Plath Bobby Schenk Sextant – White – marin sekstant for astronomisk navigasjon

Cassens & Plath Polaris Sextant – marin sekstant for astronomisk navigasjon

Cassens & Plath Horizon Ultra Sextant – Black – marin sekstant for astronomisk navigasjon

Cassens & Plath Horizon Ultra Sextant – White – marin sekstant for astronomisk navigasjon

Celestral sextants

Celestaire Astra IIIB Deluxe Sekstant – Split Horizon Mirror

Celestaire Astra IIIB Deluxe Sekstant – Whole Horizon Mirror

Celestaire Astra III Professional Sekstant – Split Horizon Mirror

Celestaire Astra III Professional Sekstant – Whole Horizon Mirror

Celestaire Astra III Professional Commercial Edition – Split Horizon Mirror

Celestaire Astra III Professional Commercial Edition – Whole Horizon Mirror

Davis sextants

Davis Mark 3 Sextant – treningssekstant for astronomisk navigasjon

Davis Mark 15 Master Sextant – sekstant for opplæring og backup

Chronometer and precise timekeeping

Artificial horizon and observation equipment

Cassens & Plath Artificial Navigation Horizon 47100 – kunstig horisont til sekstant

Practice Bubble Horizon – Artificial Horizon for Sextant Navigation

Optics and observation accessories

Astra IIIB Sight Tube (Clear Tube) – sikterør til sekstant

Cassens & Plath 4×40 Sextant Telescope – Black – marin sekstant for astronomisk navigasjon

Celestaire 7×35 Prism Telescope – høypresisjonskikkert til sekstant

Cassens & Plath 4×40 Sextant Telescope – White

Celestaire 3.5×40 Telescope – teleskop til sekstant

Cassens & Plath Star Astigmatizing Lens – Black

Universal Sight Tube for Sextant – sikterør for sekstant

Cassens & Plath Digital Sextant Unit DS-U0 – Digital sekstant for astronomisk navigasjon

Cassens & Plath Chronograph with Fixing Bracket

Cassens & Plath Prism Level – Black

Cassens & Plath Sextant Wall Mount – Black

Cassens & Plath Starglobe

Cassens & Plath StarPilot TI-89 Navigation Calculator

Cassens & Plath Universal Plotting Sheets – plotteskjema for astronomisk navigasjon

Celestaire Laminated Honest Star Chart – stjernekart

Kosmos Sternkarten – Standard stjernekart for astronomisk navigasjon

Kosmos Sternkarten – XL stjernekart for astronomi og navigasjon

Navigation Templates – Noon Sight

Navigation Templates – Sun Observation

Star Finder U.S. Pub. 2102-D

Sekstantolje

Spare parts

Celestaire Extra Split Horizon Mirror – reservespeil til Astra-sekstant

Celestaire Extra Whole Horizon Mirror – reservespeil til Astra-sekstant

Storage and transportation

Cassens & Plath Sextant Case – Light Plastic

Cassens & Plath Sextant Case – Rough Case

Cassens & Plath Sextant Case – Wooden Case

Cassens & Plath Protective Case for Artificial Horizon

Davis Sextant Carrying Case – oppbevaringsboks til Davis sekstant

Books and navigation tables

Sight Reduction Tables – Pub. 249 (Air Navigation) – Volume 1

Sight Reduction Tables – Pub. 249 (Air Navigation) – Volume 2

Sight Reduction Tables – Pub. 249 (Air Navigation) – Volume 3

Sight Reduction Tables – Pub. 229 (Marine Navigation) Volume 1

Sight Reduction Tables – Pub. 229 (Marine Navigation) Volume 2

Sight Reduction Tables – Pub. 229 (Marine Navigation) Volume 3

Sight Reduction Tables – Pub. 229 (Marine Navigation) Volume 4

Sight Reduction Tables Pub. 229 – Volume 5

Sight Reduction Tables Pub. 229 – Volume 6

Celestaire Laminated Honest Star Chart – stjernekart

Nautical Almanac 2026 – Commercial Edition (US)

Celestial Navigation for Yachtsmen

Astronavigasjon (3. og siste utgave)

Sight Solver HO-229 – analogt hjelpemiddel for astronomisk navigasjon

Sight Solver Nautical Almanac – analogt hjelpemiddel for astronomisk navigasjon

Planispheric Astrolabe – historisk astronomisk navigasjonsinstrument

Mariner’s Astrolabe – historisk navigasjonsinstrument for sol- og stjerneobservasjoner

What is a sextant used for?

Whole Horizon or Split Horizon?

Sextants at Navigasjonsbutikken Kart.no