1) The GoTenna will almost certainly not require an individual license, I'm sure it will be licensed like FRS and cellphones.

2) Do not use GMRS radios on FRS frequencies without a GMRS license. You need a GMRS license to transmit on any GMRS or shared frequency.

3) In the case of a bona fide emergency (think life-threatening), you can transmit on frequencies that you are not licensed to use without breaking the law.

4) If you own a GMRS radio that you should have a GMRS license. If you don't want to get a GMRS license, get an FRS, CB or MURS radio. If range is a big deal to you MURS handhelds generally get better range than GMRS handhelds.