Map data is provided by the respective provider of map tiles. Each map shows its source on screen.
First version of aviation data like airport coodinates, runway dimensions, frequencies, etc. is taken from ourairports.com. This is a great source of inofficial data. We try to verify and correct with official data taken from AIP documents.
These times are calculated using the PHP library function which gives a reasonable approximation. However, please note that there are different definitions for these times and that legal values might even be different by several minutes. Please consider the official documents.
Current magnetic variation is computed according to the world magnetic model published by NOAA. This delivers an approximation of the real value which should be sufficiently precise for our purpose. Please consider official documents.