Samsungs also have actual gps chips.
Specifically the S8 has A-GPS, GLONASS, BDS, GALILEO
We need more info on what you are trying to do to give options. If you are just trying to get more accurate gps location on your phone you have to go into setting and turn on high accuracy mode under...
You also need to consider vandalism
Its up to you if you want a not protected always hot direct to battery connection accessible form the outside of you truck. It also depends of where you go, always in the bush probably not an issue. Downtown Seattle, probably more of an issue.
I have both...
What do the people you want to talk to use?
What modes do you want?
What is you budget?
What bands do you want to cover?
What kind of install do you want? Permanate or Easily moveable to another truck?
Radios are like cars and the answer is always depends. LOL
I like CB mostly for the features that come in the units that arent readily avaialbe in other radios, and many truckers still use them up here. Primarily I like the CB radios for NOAA weather alerts and PA built into one unit.
As too the fire extingusher, its an easy place to save weight and space. I have been using these (E50):
They are no bigger than a road flare with 4 times more discharge time than a 5lbs and leave no residue