Cassens & Plath
Precision.
For life at sea.
German craftsmanship.
Measured against the horizon.
Discover Cassens & Plath sextants and celestial navigation equipment. From CP Sailing to Horizon Ultra – precision instruments for navigating by the Sun and stars.
A history
rooted in seafaring.
Cassens & Plath was founded in Bremen in 1902 by Captain Tanne Janssen Cassens. Experience at sea shaped the business: navigators needed instruments they could trust.
The Bremerhaven site opened in 1972. Here the tradition of precision nautical instruments continues, including sextants and magnetic compasses. Instruments are assembled, adjusted and tested by hand in Germany.
At Kart.no you will find a broad selection of the company’s sextants, from CP Sailing and Professional to Bobby Schenk, Polaris and Horizon Ultra. We also offer optics, observation equipment and protective cases.
Different observations.
The same demand for precision.
Horizon Ultra features polarising filters and a Schüler double prism for solar observations. Polaris features a Free View mirror and star-spreading glass for observing stars and planets. Explore the models and choose the instrument for the way you navigate.
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In stock
Cassens & Plath Horizon Ultra Sextant – Black – marine sextant for astronomical navigation
2.223,41 € Add to cart -
Made to order
Cassens & Plath Horizon Ultra Sextant – White – marine sextant for astronomical navigation
2.223,41 € Add to cart -
Made to order
Cassens & Plath Polaris Sextant – marine sextant for astronomical navigation
1.915,66 € Add to cart
Designed with
the sailor in mind.
Named after circumnavigator and author Bobby Schenk, the range includes black and white versions as well as the Astro Classic. See the product pages for differences in equipment and features.
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Made to order
Cassens & Plath Bobby Schenk Sextant – Black – marine sextant for astronomical navigation
1.761,80 € Add to cart -
Made to order
Cassens & Plath Bobby Schenk Sextant – White – marine sextant for astronomical navigation
1.761,80 € Add to cart -
Made to order
Cassens & Plath Bobby Schenk Astro Classic Sextant – marine sextant for astronomical navigation
1.684,86 € Add to cart
Choose your mirror.
Find your way of working.
The Professional range offers a choice of horizon mirrors and illumination. Compare Full View, Split View and Free View, and check each variant’s product details for optics, approval and included equipment.
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Made to order
Cassens & Plath Professional Sextant – Full View – marine sextant for astronomical navigation
1.454,06 € Add to cart -
Low stock
Cassens & Plath Professional Sextant – Full View Illuminated – marine sextant for astronomical navigation
1.454,06 € Add to cart -
Made to order
Cassens & Plath Professional Sextant – Split View – marine sextant for astronomical navigation
1.454,06 € Add to cart -
Low stock
Cassens & Plath Professional Sextant – Split View Illuminated – marine sextant for astronomical navigation
1.454,06 € Add to cart -
Made to order
Cassens & Plath Professional Sextant – Free View Illuminated – marine sextant for astronomical navigation
1.454,06 € Add to cart
A practical starting point.
A traditional skill.
CP Sailing has an aluminium frame and 4×40 telescope. Choose Full View or the traditional Split View mirror – two options for courses, practice and celestial navigation at sea.
The mirror makes a difference.
Full View
A semi-transparent horizon mirror allows the horizon and celestial body to overlap in the field of view. Many people find this an accessible way to learn the technique.
Split View
The traditional design combines a clear section and a mirrored section. You see the horizon directly through the clear part and the celestial body in the reflective part.
Free View
Cassens & Plath also offers Free View mirrors, including on Polaris and a Professional variant. Read the model details and contact us for help comparing the options.
Build on
your instrument.
Find telescopes, an artificial horizon and observation aids. Check compatibility with your sextant before ordering; we are happy to help you choose suitable accessories.
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Made to order
Cassens & Plath 4×40 Sextant Telescope – Black – marine sextant for astronomical navigation
322,20 € Add to cart -
Made to order
Cassens & Plath 4×40 Sextant Telescope – White
322,20 € Add to cart -
Made to order
Cassens & Plath Star Astigmatizing Lens – Black
340,66 € Add to cart -
Low stock
Cassens & Plath Artificial Navigation Horizon 47100 – artificial horizon for sextant
1.837,19 € Add to cart
Support for observation and readings
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Low stock
Cassens & Plath Chronograph with Fixing Bracket
220,65 € Add to cart -
Made to order
Cassens & Plath Prism Level – Black
229,88 € Add to cart -
Made to order
Cassens & Plath Digital Sextant Unit DS-U0 – Digital sextant for astronomical navigation
1.845,50 € Add to cart -
Made to order
Cassens & Plath StarPilot TI-89 Navigation Calculator
829,97 € Add to cart
Safe storage.
At home and underway.
Explore lightweight cases, robust Rough Case options, traditional wooden cases and a wall mount. See each product page for dimensions, contents and compatibility.
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Low stock
Cassens & Plath Sextant Case – Light Plastic
137,71 € Add to cart -
Made to order
Cassens & Plath Sextant Case – Rough Case
322,20 € Add to cart -
Made to order
Cassens & Plath Sextant Case – Wooden Case
322,20 € Add to cart -
Low stock
Cassens & Plath Protective Case for Artificial Horizon
202,18 € Add to cart -
Made to order
Cassens & Plath Sextant Wall Mount – Black
229,88 € Add to cart
Stars, plotting sheets
and navigation knowledge.
Star charts, a star globe and plotting sheets help you prepare and work through your observations. The range supplied through Cassens & Plath also includes Kosmos star charts.
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Made to order
Cassens & Plath Starglobe
2.269,57 € Add to cart -
Made to order
Kosmos Sternkarten – Standard star charts for astronomical navigation
46,08 € Add to cart -
Made to order
Kosmos Sternkarten – XL star charts for astronomy and navigation
64,54 € Add to cart -
Made to order
Cassens & Plath Universal Plotting Sheets – plotting scheme for astronomical navigation
41,46 € Add to cart -
Low stock
Navigation Templates – Sun Observation
27,62 € Add to cart -
Low stock
Navigation Templates – Noon Sight
27,62 € Add to cart
The horizon is the start.
Knowledge takes you further.
A sextant measures the angle. Reliable time, an almanac, calculations and practice turn an observation into a position. At Kart.no you will also find books and sight reduction tables to develop your skills.
Explore our celestial navigation range ↗Good to know before you choose.
Where is Cassens & Plath from?
The company was founded in Bremen, Germany, in 1902. It has been based in Bremerhaven since 1972, and its instruments are assembled, adjusted and tested by hand in Germany.
How do Horizon Ultra and Polaris differ?
Horizon Ultra features polarising filters and a Schüler double prism, while Polaris has a Free View mirror and star-spreading glass. The manufacturer highlights Horizon Ultra for solar observations and Polaris for stars and planets. See the individual products for full specifications.
Which sextant is suitable for courses and practice?
CP Sailing, Professional and Bobby Schenk are useful ranges to compare. Your choice depends on budget, mirror type and intended use. Contact us for advice or a quotation for courses and teaching.
Are a case and accessories included?
Included equipment varies between models. Read the product description before ordering and ask us if you need clarification about cases, optics or compatible accessories.
We help you choose.
Unsure about models, mirrors or accessories? Contact Kart.no and we will help you find a sextant to suit your observations and experience.