Navtools Lite a program for astro-navigation, made by 1st mate/Programmer Geert Sassen.
It is primarily intended as a backup to existing (GPS) navigation systems.

Pure-Data is the registrationpartner of Geert Sassen. The latest evaluatieversion can be dowloaded. A full list of the software and updates can be found at Geert's site. It's possible to get a copy of the evaluation version on CD-ROM.

Functions of Navtools Lite

• Complete Nautical Almanac (61 stars, sun, moon, all planets)
• Starfinder: list of all visible stars at a certain time and location
• Times of rise, set, meridian passage for all celestial objects at a certain date and location
• Calculation of present true position after two or more sextant observations
• Calculation of compass error after azimuth bearing
• Continous calculation of the vessels dead-reckoning position
• Calculation of true course and speed after position update (either from sextant observations or GPS)
• Calculation of present current after each position update
• Waypoint-navigation, unlimited number of waypoints, either via greatcircle or rhumbline
• Continous calculation of required speed and required engine setting for a certain scheduled ETAVessels performance: calculation of average speed, engine revolutions, etc during all voyages - Calculation of average weather conditions during all voyages on a certain run and season.
• Calculation of vessels squat and true draft (based on present speed and conditions)
• Calculation of wheel over point distance (based on next course change and present speed)
• Calculation of geographical range of light or mountain top
• Calculation of distance to shore based on vertical sextant observation ('Hengeveld').
• Metric conversions: fathoms to meters, Celcius to Fahrenheit, etc, etc
• Hurricane tracking (continous calculation of hurricane position, distance, bearing, etc
• Logging (to standard text-file) of all user-actions (position updates, course/speed changes, etc