You are supposed to declare the frequency pair you are going to use on GMRS. Your license then covers only operations on that pair. Operations that require licensing outside that pair are technically illegal. Operations on the FRS only frequencies still require usage of FRS approved equipment to be legal even if the operator holds another license class. Are there going to be FCC agents waiting to nab you the first time you don't follow the exact rules,no. The biggest driver in illegal operation complaints is being an asshole. Don't act like one and if you actually got reported you would get a slap letter at worst. Without spending a day going down the enforcement action rabbit hole, there may be a dozen enforcement actions in the last couple years total and all of them involved a concerted effort by the offender to be an ass.
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this.
just don't be a dick.