I’d suggest you start with an inexpensive Chinese made UHF radio such as a Baofang, they cover a wide spectrum of frequencies, you can listen to NOAA, and I believe even cover marine bands. Be aware some frequencies require a license to transmit on, but here in America we can transmit on those frequencies without a license if it’s an emergency. Local laws will vary though, so connect with a local HAM operator and pick their brain.

Cheers