It seems to me that if I own the software in the 192C ..
You, indeed, own the software that came with your unit. Garmin, however, owns the copyright and has chosen to keep it proprietary. You have it, you just can't do anything with it except in the 192.
If you want to feed the 182 and the 60CSX, buy the Bluechart CD, required cables, and down load to two units of your choice ...