Altitude Crossing Calculator

This add-on provides a simple JavaScript-based calculator to estimate where you will cross a specific altitude during descent, useful for setting reminders like seat belt sign elevations in the FMC. It allows pilots to input descent rate, ground speed, and waypoint data to calculate the distance needed to reach a target flight level. Additional features include calculating required descent rates to meet altitude constraints within a certain distance. The tool is browser-based and works on any device for quick, approximate planning.