Info on GMRS (General Mobile Radio Service) radios and the GMRS license (not ham):

Many hams get both GMRS and Ham License to make it easier to “Uncle Jim” their family members into radio:

GMRS radio: GMRS Radio is a great pathway to ham radio.

• Unlike ham radio, you don’t have to take a test; $35 and good for 10 years.

• Programming radio not an issue (the radios have numbered channels, should we informally use channel 21? no one technically owns a channel)

• Your license can be used by your immediate family members (husband, wife, kids, siblings, parents, grandparents, aunts, uncles, etc).

• It is interoperable with the unlicensed FRS radios, (GMRS has much higher power output limits and you can use GMRS repeaters)

GMRS has some rules for use:

• The key thing with using any licensed radio in the US, don’t be a jerk on the airwaves and you are 99% the way to avoiding any unwanted FCC attention.

• No messages in connection with any activity which is against Federal, State, or local law (ie, don’t use radio to commit your crimes)

• No false or deceptive messages

• No coded messages with hidden meanings (“10 codes” are permissible – CB users, you know what we mean but for those of you scratching your head check this link for a 10 Code List)

• No music, whistling, sound effects or material to amuse or entertain

• No ads or offers for the sale of goods or services

• No ads for political candidate or political campaign

• No international distress signals (like Mayday) unless in a vehicle in immediate danger

• No communicating with stations in the Amateur Radio Service, any unauthorized station, or to any foreign station

• No continuous or uninterrupted transmissions (unless communications have to do with the immediate safety of life or property)

• No messages for public address systems

• Must identify using FCC-assigned call sign at the end of transmissions and at periodic intervals during transmissions

https://midlandusa.com/blogs/blog/why-do-i-need-a-gmrs-license-how-do-i-get-it