Tools

• Standard atmosphere

  Temperature, pressure, density and speed of sound at any altitude of the ICAO standard atmosphere or the database's older models, with an ISA deviation; pressure and density altitude.

• Unit converter

  Feet, knots, pounds, psi, inches of mercury, degrees Fahrenheit and the SI units with their prefixes, from the catalogue's unit tables.

• Periodic table

  The chemical elements in their groups and periods, coloured by family; each opens its record in the database.

• Physical constants

  The CODATA 2022 values of the fundamental constants, and the standard atmosphere's, WGS 84's and the IAU's, with their units and uncertainty.

• Morse code

  Text to Morse code and back, played aloud if you like, with the table of letters, figures, punctuation and procedure signals.

• Q codes

  The radio operators' three-letter codes (QNH, QFE, QDM, QSY…) with their question and answer in plain English.

• Great circle

  The shortest distance between two points on the Earth, and the path on a map.

• Coordinates

  Decimal latitude and longitude to degrees, minutes and seconds, and back.

• Geometrical tolerancing

  The symbols of the geometrical characteristics, and which ones need a datum.

In preparation

Dates and time stamps · Shaft and bore fits · Vectors, matrices and best fit