I should have included this detail with the list I posted in response to Lee this morning. You don't need the SEAiq app to investigate chart costs. The chart sources are just commercial outlets; conventional e-commerce websites, if you will. SEAiq supports charts in .bsb and .kml format. The encryption keys need to be installed with the charts, and the key and charts usually come as a package. It's the keys that you pay for, of course, when you buy charts. Here are the source urls for the sites I mentioned in my earlier post. These sites would be the same chart source sites whether you were using SEAiq or any other commercial navigation software, or whether your OS platform was iOS, Mac OSX, Android or Windoz. PRIMAR: www.primar.org <http://www.primar.org/> Chart World: http://chartworld.com <http://chartworld.com/> AHS: www.hydro.gov.au <http://www.hydro.gov.au/> Bremer: http://bsmd.de <http://bsmd.de/> VentureFarther: www.venturefarther.com <http://www.venturefarther.com/> Hope this is useful! Jim Peg and Jim Healy aboard Sanctuary, currently at Charlotte Harbor, Punta Gorda, FL http://gilwellbear.wordpress.com <http://gilwellbear.wordpress.com/> Monk 36 Hull #132 MMSI #367042570 AGLCA #3767 MTOA #3436