Some portions of Autopilot++ include code or other content from third parties. Copyright notices and licensing information for these are listed here.
The great circle functions and approach calculations are based on code from Geodesy:
The MIT License (MIT)
Copyright (c) 2014 Chris Veness
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
The ICAO airports database is based on files from OurAirports (2020/05/16), which have been explicitly released into the public domain by the copyright author. Here is an extract from their website (current as of writing):
For more intense work, we have a CSV-formatted data dump of all our airports, countries, and regions, which we update every night. You can download these files and open them with almost any spreadsheet program or import them into your own database. You can even use them to set up your own, competing airport web site if you'd like! We'd love you to give us credit, like we give credit to our sources, but you're not required to.
DOWNLOAD AND USE AT YOUR OWN RISK! We hereby release all of these files into the Public Domain, with no warranty of any kind — By downloading any of these files, you agree that OurAirports.com, Megginson Technologies Ltd., and anyone involved with the web site or company hold no liability for anything that happens when you use the data, including (but not limited to) computer damage, lost revenue, flying into cliffs, or a general feeling of drowsiness that persists more than two days.
Do you agree with the above conditions? If so, then download away!
The waypoints database is based on files from the X-Plane Airport & Navigation Data site. We use these files under version 3 of the GPL, as permitted by their copyright notice:
1100 Version - data cycle 1611, build 20161011, metadata FixXP1100.
Copyright © 2016, Robin A. Peel (robin@x-plane.com).
This data is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program ("AptNavGNULicence.txt"); if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.