VINCENTA

Electronic Celestial Navigation,
Made Practical

Reliable. Independent. Ready when electronic systems cannot be relied upon.

Vincenta transforms the TI-Nspire™ CX graphing calculator into a dedicated, fully-featured celestial workstation with weeks of battery life. Perform sight reductions, explore the in-built planetarium, identify unknown stars, analyse observation rounds, and plot multi-body running fixes—all from one compact handheld computer.

Pre-Loaded Handheld Systems Software Licence Only (£129)

Vincenta interactive sky plot with Bellatrix highlighted and Orion constellation drawn

Vincenta celestial running fix with USNO algorithm plot screen

When systems fail,
the stars remain.

Satellite navigation has transformed offshore navigation, yet prudent seamanship still demands an independent means of determining position whenever GNSS cannot be relied upon.

Vincenta combines the timeless principles of celestial navigation with modern computing power to create a practical, dependable celestial navigation aid for today's sailor.

Why Vincenta?

Designed specifically for offshore sailors who value dependability, simplicity and independence.

Comprehensive Celestial Navigation Toolkit

Sight reduction, running fixes, navigation triangles, sky plot, star and planet identification, sight analysis, sight and log data management, and more.

Independent

Operates entirely without an Internet connection and independently of GNSS. No surprises with forced system updates while in operation.

Always Ready Hardware

Runs on the dependable TI-Nspire™ CX graphing calculator — a dedicated, energy-efficient platform designed to be available when phones, tablets and onboard systems cannot.
Don't own one yet? Most Vincenta users wouldn't either. Learn how to get started →

TI-Nspire CX running Vincenta Triad finder

Why the TI-Nspire™ CX?

Vincenta was conceived around one simple principle: a dedicated celestial navigation computer should be as dependable as the sextant it accompanies.

Rather than relying on a smartphone or tablet, Vincenta runs on the TI-Nspire™ CX graphing calculator — a dedicated, energy-efficient computing platform with exceptionally long battery life, fast start-up and no background applications competing for attention.

Despite its modest size and excellent battery life, the TI-Nspire™ CX provides impressive computational performance. Calculations that once required tens of seconds on earlier programmable navigation calculators are now completed typically in just a few seconds on the TI-Nspire™ CX, and even faster on the newer TI-Nspire™ CX II, if not almost instantenously. Whether reducing a sight, generating a complete sky plot or identifying celestial bodies, Vincenta responds quickly enough to keep your navigation flowing naturally.

✓ Completely cable-free — take it directly onto deck or into the cockpit
✓ Compact & lightweight (fits in an oilskin pocket)
✓ Exceptionally long battery life (days of active use)
✓ Instant power-on at the companionway
✓ Night-vision preservation mode for deck work
✓ No Internet connection, phone signal, or power cords required

Learn about the TI-Nspire™ Get the User Guide

New to the TI-Nspire™?

Most Vincenta users would start exactly where you are. They would likely have to purchase a TI-Nspire™ specifically to run Vincenta, creating a dedicated celestial navigation computer that is completely independent of phones, tablets and onboard systems.

The TI-Nspire™ CX is a well-established graphing calculator used worldwide by schools, colleges and universities. Both the original TI-Nspire™ CX and the newer TI-Nspire™ CX II run Vincenta perfectly.

If you are new to the platform, we'll help you choose the right model, show you where to obtain one, and guide you through installing Vincenta.

Already own a TI-Nspire™?
Perfect — simply purchase the software licence and install Vincenta.

Purchase Vincenta Licence

Don't own one yet?
You can skip sourcing and configuring hardware yourself. We offer ready-to-navigate systems, including fully tested refurbished handhelds starting at the price of the licence alone (hardware essentially free!), as well as brand-new factory-fresh units.

Pre-Loaded Handhelds

Simple and intuitive sight reduction input screen

Straightforward to Learn

Celestial navigation has a reputation for being difficult. Vincenta was designed to make it approachable without compromising the underlying principles.

Clear menus, guided workflows and graphical tools help you move naturally through every stage of the navigation process. Use the calculator touchpad, arrowkeys, or predefined keyboard shortcuts to rapidly select menu items, fill in input fields, and execute calculations.

Whether you are taking your first sextant sight or already have years of experience, Vincenta lets you concentrate on understanding the navigation rather than performing repetitive calculations.

✓ Clear menu-driven workflow
✓ Logical screen layout
✓ Interactive graphical displays
✓ Designed for both students and experienced navigators

Vincenta Sky Plot screen showing triad finder tool

Interactive Sky Plot

Identify celestial bodies instantly using an intuitive graphical representation of the sky.

Plan observations, find best triads, identify objects and constellations, measure angular distance between objects, and bring a complete planetarium directly onto deck with you as you observe under the night sky.

Vincenta celestial Running Fix plot with the USNO algorithm

Running Fixes

Construct accurate running fixes graphically and with the USNO numerical method, including intercept calculations, line of positions, fix uncertainty analysis, plot panning and zooming, saving results to log folders, and more.

Read USNO 1999 Benchmark Report →

Sight Analysis

Use Vincenta's powerful sight analysis tool to analyse a round of sights, apply dedicated functions for local apparent noon analysis, exclude sights from calculations, save the best sights, and more.

Sight Folders

Stay organised by saving and grouping sight reductions into individual folders, while arranging your archive to suit your workflow.

Log Folders

Organise your dead reckoning, estimated points, and fixes in log folders to suit your style of logging.

Everything You Need — Already On Board

Vincenta performs all astronomical calculations internally. Once installed on a TI-Nspire™ CX, it provides the astronomical data and computational tools needed to perform celestial navigation without relying on external resources.

Because Vincenta runs on a self-contained, energy-efficient handheld calculator, it goes wherever you take your sextant — from the chart table to the weather deck. No power cables across the cabin floor, no fragile glass screens, and no dependence on 12V vessel power.

To perform celestial navigation with Vincenta, all you need is:

✓ A sextant
✓ A TI-Nspire™ CX running Vincenta
✓ A nautical chart

Vincenta does not require an external Nautical Almanac, sight reduction tables or an Internet connection to perform celestial navigation calculations.

Observe First. Identify Later.

When a star or planet appears through a brief gap in the cloud, there may be no time to identify it before taking a sextant observation.

With Vincenta, that's not a problem. Record the sight first, then use the Body Identification tool to identify the observed star or planet from its approximate bearing and measured altitude. Once identified, simply perform the sight reduction again using the correct celestial body.

Ready to Get Vincenta?

Choose the option that fits your setup: install Vincenta onto your existing calculator, or get a complete ready-to-navigate handheld system pre-configured and tested.

Purchase Single Licence (£129) Pre-Loaded Handhelds (from £129, free handheld!)

Need multiple licences for teaching or a fleet? View all licence options

Prepared for Independent Navigation

Satellite navigation has transformed offshore navigation and remains the primary means of navigation for most sailors.

Nevertheless, prudent seamanship has always encouraged carrying an independent means of determining position. Vincenta complements the traditional sextant by assisting with repetitive astronomical calculations, and providing a practical electronic aid for independent celestial navigation when primary electronic systems cannot be relied upon.

It does not replace navigational knowledge — it puts powerful computational tools into the hands of the navigator.

Learn More

VINCENTA

Electronic Celestial Navigation,
Made Practical

When systems fail,
the stars remain.

Why Vincenta?