We are both correct. The instructions posted by
Garmin here clearly states that the installing dealer or manufacturer is supposed to input the MMSI for you.
Garmin includes the
software with the transponder to do the data entry. Since I did my own
installation, as would you, you'd qualify as your own installing dealer I guess.
I programmed my own - it's an easy piece of
software to operate. You load it into your computer and then connect the
AIS 600 to the computer via a USB cable. Its just a matter of filling in the information and hitting save.