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I don't know where it's mentioned in the rules, but I'm sitting here looking at an associate's recently issued (01-27-2018) GMRS license renewal in front of me and it states the following. Licensees who operate North of Line A and East of Line C may not operate on channels 462.650 MHZ,467.650 MHZ, 462.700 MHZ and 467.700 MHZ unless your previous license authorized such operations. So it would seem to me that those lines continue to exist. Regards, Frank. P.S. And would someone please notify the FCC that the word megahertz is abbreviated MHz, and to always use a blank space after a comma.

Also to answer you other question, here is some good info for reading about frequency tones: Continuous Tone-Coded Squelch System Digital Code Squelch (DCS) CTCSS and DCS Tones -- What's the difference? btw - The "travel tone" is 141.3 Hz. Here is some good info about repeaters and offsets: Repeaters - RadioReferecne Wiki Offset - RadioReference Wiki For GMRS, the offset is always +5 MHz. A GMRS repeater operating on 462.675 MHz will have an input frequency 5 MHz higher at 467.675 MHz (which is also listed as a GMRS frequency). Glad you're interested in the hobby - feel free to ask any questions!