July 2025

LSALT Calculator

Automatically calculate LSALT per leg in Australia using terrain, obstacles, and corridor width.

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Automatically calculate the lowest safe altitude for each leg of your route based on terrain, obstacles, and your selected corridor width. The LSALT Calculator was designed with Australian pilots in mind and is available with Essential plans and above.

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Release notes

Streamline your IFR planning and comply with CASA requirements with auto-calculated lowest safe altitudes (LSALT) based on per-leg terrain and obstacle data.
The LSALT Calculator setting is available in the Map Settings menu and is enabled by default for all non-military accounts with the Australia subscription region.
Access the calculator from either the FPL NavLog under the LSALT column or by tapping any route leg on the map and tapping LSALT.
ForeFlight will automatically calculate each leg’s LSALT based on one of four available values - Grid or Route LSALT, or the highest terrain or obstacle along each leg. You can also manually set the LSALT in 100’ increments.
Multiple Splay Type settings are available to calculate the size of the terrain and obstacle corridor around each leg, such as RNP 2 or 4, GNSS and non-GNSS RNAV, night VFR, and radio navaid.
While the LSALT Calculator is open for a given leg, the corridor for that leg is depicted in green on the map based on the splay type, and the Hazard Advisor map layer is automatically enabled and set to the current LSALT altitude to highlight the location of hazards at that altitude.
LSALT Calculator is available with Essential plans and above that include the ForeFlight Australia region.

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