Entering Lat/Lon Waipoints

Hi,I have a flight plan created with FSBuild 2.2 which I load into the 747 FMC. The route includes coordinate waypoints like 53N030W, 53N020W, etc. The plan is loaded and accepted.http://forums.avsim.net/user_files/180856.jpgHowever, when I try to enter waiponts like these, the FMC reports "Not in database."I have to type it in according to the FMC user Guide: N53W020, but the FMC reads back N53W019.http://forums.avsim.net/user_files/180857.jpgWhy does the FMC accept the spelling 53N020W when imported, but not when typed?Thanks!Silvestre