Hello,

could someone give me a recommendation for an application for Mac, where I can plan waypoint missions in advance?
And another quastion: the copter should follow a trail in the mountains and it should stay for example 200 feet (AGL, Hight Above Ground) above the trail, does it correct the elevation by itself? Does the copter mesure the hight while flying?

Greetings

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check out litchi, they do have a web application!
https://flylitchi.com/hub

For me MacGPS Pro navigation software it is  Flexibility: Support of open-standard format maps, aerial photos and charts, scan-your-own maps up to 32766 pixels wide, as well as our own maps and charts. Real-Time: Connect to NMEA from many GPS receivers. View your position and navigate to your destination on a wide variety of digital topo maps and marine charts.
Waypoints, Routes, and Tracks: Create and edit. Use on the Mac. Transfer to and from smartphone apps, many Garmin receivers, and other software.

It depends on the hardware configuration of the drone. Generally speaking, any software like that is flexible enough to accommodate many different hardware configurations is chosen. An example of such software is Axonim