We got the UV6R but it’s very similar. They gave us I think 11 frequencies. Within each of those you can use whatever DCS or CTCS (if I remember the acronyms correctly) you agree on with your mates. For programming, there’s loads of vids on YouTube, and lots of advice and manuals online. Here’s one resource: http://www.miklor.com/uv5r/
Difficult to imagine a situation where it’d be useful rather than just a thematic fairground ride (like with helicopters, boats, etc.) but it’s probably a fun inclusion to a game. What were the circumstances, and how was it used?
You probably already have goggles that you like apart from the fogging, so, those plus ExFog. It’s like £90 (Patrolbase sometimes have them, I imported it from Canada before they started carrying it) but it’s the best antifog product available.