That's good info. Was it only channel 19 and 21? AI cited the below codes to me but when I looked them up, nothing about Line A. If it were still affect, I guess my local reliance NET peeps would not be such a reliable source since they use channel 17, 18, and 22 within Line A.
The FCC Part 95 sections relevant to Line A restrictions for GMRS operations near the U.S.-Canada border are:
47 CFR § 95.309: Defines Line A as a line ~120 km (75 miles) south of the U.S.-Canada border and prohibits certain GMRS channels (462.550–462.725 MHz and 467.550–467.725 MHz) north of it.
47 CFR § 95.1767: Specifies GMRS power limits, including ≤5 watts ERP for handhelds and ≤50 watts for mobiles on allowed channels (e.g., 462.5625–462.7125 MHz) north of Line A.
47 CFR § 95.1705: Prohibits GMRS fixed-base stations north of Line A and outlines general operational rules.
47 CFR § 95.1763: Lists GMRS channel frequencies, clarifying which are restricted (channels 15–22) or permitted (channels 1–14) north of Line A.
47 CFR § 95.1733: Prohibits interference with Canadian systems, reinforcing Line A restrictions.