For "overlanding" a Technician class license (1st of 3 license classes) is sufficient, however if you think you may want to explore ham radio as a hobby I would recommend getting at least a General class license. "Overlanding" lends itself to the ham radio hobby well with events such as Parks on the Air (POTA), Summits on the Air (SOTA), and Field Day/Winter Field Day. The General license gives access to more HF frequencies for World wide communication. For study material I typically recommend
HamStudy.org: Cutting edge amateur radio study tools or
No-Nonsense Study Guides - KB6NU's Ham Radio Blog . If you choose to go with the hamstudy.org material I also recommend doing the "Read Questions" section as it gives the question and highlights the correct answer. Read the correct answer only. Go through them a couple of times before taking any practice test, the correct answers should jump out at you. Once you are getting 80% of better, preferrably better then you are ready to test. You can also find test sessions either in person or virtual on at
HamStudy.org: Find an Exam Session or check with your local ham club.
To clarify some terminology used in this thread:
Band: Is a range of frequencies typically referred to by their wavelength. The two most popular bands among Technician licensees and overlanding are 2 meters (2m) and 70 Centimeters (70cm). The 2m band ranges from 144-148MHz, the 70cm band ranges from 420-450MHz. The approx. wavelength can be obtained from the frequency by dividing 300 by the frequency. example: 300/146MHz = 2.05. The opposite is true as well, to find approx frequency from a wavelength, divide 300 by the wavelength. Example: 300/.70 = 428. This is part of the ham study material.
Modes: There are different types of transmissions, but in the idea of "overlanding" it relates more to FM voice or digital voice. Within digital voice there are different types such as Fusion, Dstar, DMR, P25, etc. Fusion is pretty specific to the Yaesu brand radios, Dstar is pretty specific to Icom brand radios, there are multiple companies making DMR, and P25 isn't heavily used. This isn't really necessary for "overlanding" and is something I relate more to the ham hobby. Also the type of digital mode used can vary by location and may require some research to see what's used in your area if you plan on going with a digtal voice capable radio.
Another digital mode that is commonly used among "overlanders" is APRS, I will save time here and just link to a previous write up I've done.
Intro to APRS | OVERLAND BOUND COMMUNITY
Ham stores: Ham Radio Outlet (
www.hamradio.com), DXEngineering (
www.dxengineering.com), Gigaparts (
www.gigaparts.com), and MTC Radio (
www.mtcradio.com) are the most popular ham radio stores and have better prices than Amazon for name brand radios.
Name Brand Radios: Yaesu, Kenwood, and Icom are typically referred to as the big 3. Alinco could be considered in there as well and may take Kenwood's spot as they seem to be pulling out of the ham radio game.
Radios: You could get by with a 2m mono band radio, but it would be better to not limit yourself since there are repeaters and linked repeaters using 70cm as well.
You can get a name brand dual band ham radio for $260-$310 but there are radios that run $460-$590 depending on the options you want. Also don't forget an antenna, antenna mount and coax in your budget. 2m and 70cm are considered line of sight and as such to get more distance you will want the antenna up high due to the curvature of the Earth, unless you are a flat earther then this wouldn't apply to you. Some people choose to mount the antenna on the fender or rear tire carrier and while it will work it won't reach as far but sometimes you have to make compromises. If the antenna is not mounted near the middle of the roof, it's a compromise to some degree as the radiation pattern of the signal can be skewed.
GMRS as mentioned is also a licensed radio service but it's a pay to play fee, $70 (supposed to be changing to $35 sometime this year), covers your immediate family and is good for 10yrs. GMRS is a good replacement for CB and many of us run both....or all 3 as you never know who you may come across or ride with.
I will stop babbling on with #radionerd stuff but if you have any questions feel free to hit me up.