This is my first bird.  I own 2 brand X.  It would be nice to have the ability to load only the files you desire to use from the SD card into the Humminbird unit.  Brand X allows me to load only the files I will be using in a one day fishing trip.  Just saying.  So far I love my 998.  This option would allow for more convenient management of waypoints and such.  Maybe I missed something but I have to download everything on my unit to get to the waypoints I want to work with.