Predication Classes

Prediction Classes

CLASS 0

Altitude information for site is not know. This reduces accuracy and the result can be off by up to 30 seconds (for land.)

CLASS 1

Altitude information is used to calculate air density and other parameters. Very accurate for an ideal horizon.

CLASS 2

CLASS 3

Altitude information is used to calculate air density and other parameters. Additionally, local current air pressure information and temperature information are supplied to improve accuracy. Furthermore terrain or height above terrain information is taken into account. Very accurate for any horizon (unless very mountainous and the horizon is raised - conversely, this is very accurate for horizons that are lower than the observer.)

CLASS 4

Altitude information is used to calculate air density and other parameters. Additionally, local current air pressure information and temperature information are supplied to improve accuracy. Furthermore terrain and height above terrain information is taken into account. Very accurate for any horizon (unless very mountainous and the horizon is raised - conversely, this is very accurate for horizons that are lower than the observer.)

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