We'll soon have a current introduction to OGM2 here. Our thanks to the tech team of Bogdan Szabo, Alexandra Casapu and Ciprian Samoila, and their great open work!
February 2020 - open to Map Makers to update OGM1 maps and data, provide feedback 2020 March 2020 - open to all for Beta testing
Map Making Tutorial
http://bit.ly/ogm2info (for both new and returning mapmakers)