I am using Oruxmaps for nautical navigation. Recently the Dutch government has made nautical maps in ENC format available (
There are free ENC maps available for the Netherlands, Belgium, Germany, Croatia, Serbia, The Czech Republic, Rumania, Slovakia, Hungary, Bulgaria, Switzerland en the USA.
I know I can buy paper maps every year, scan them and covert them into a readable format. That is a hell of a job in the first place and you are likely to make mistakes during the procedure of calibration.
Compatiblity of ENC maps with Oruxmaps would be a great feature for this great application!
peteradriaan