Here's my collection of discovered and written reference material.
Does your FRS or GMRS radio have privacy codes, sub codes, or interference eliminator codes? They are all kind of the same thing, except different. What if you want to use your Cobra GMRS radio or a Baofeng GMRS-V1 with your Motorola TalkAbout? I've got answers for all these questions, plus a short tutorial on squelch, which is really what these privacy codes are.