OffRoaderX

My GUESS is that you are describing an MDC, which is a digital tone that some radios output containing their radio-ID. Similar radios can decode the MDC tone and display the ID, or other person's name on the screen.

It does not really require much research - just follow this formula: 
IF radio is manufactured after 2017 AND IF radio says "GMRS" on the box THEN = FCC Type Accepted*
 
*99.9998% of the time

Technically,  by Rule your GMRS License covers your immediate family(wife,kids,brothers, sisters,etc.)that live in the same State AND they too need to give your(the)call sign every 15 minutes to stay in compliance.
If you don't follow this "Rule" then you know what'll happen......NOT A DANG THING, that's what.  Go watch NotaRibicon's latest video on the YouTubes and you'll see just how many and why people were busted by the FCC. 

My fix would be to send it back and tell them to either send you one that works as advertised, or give back your money..
But, thats just me...

There's your problem, right there.. The iCom IC2730A is not a GMRS radio..
Good luck!

My fix would be to send it back and tell them to either send you one that works as advertised, or give back your money..
But, thats just me...

My fix would be to send it back and tell them to either send you one that works as advertised, or give back your money..
But, thats just me...

My fix would be to send it back and tell them to either send you one that works as advertised, or give back your money..
But, thats just me...

I have one mounted on a cookie-sheet in the window.  You only need a few inches of metal around the base, and it doesn't even need to be solid-metal, it can be strips. There is also an inexpensive ground-plane mount you can by that will do the job, but i dont think the hand-railing alone will do the job unless it's at least 6-10 inches wide.
My 72G on the cookie-sheet works fine - it has an SWR below 2 and I can hit repeaters 70 miles away and talk on simplex with HT's ~20 miles away.. YMMV based on terrain.

The best and most important functions to have on a radio are the ones that are most important to you and allow you to do whatever you want to do with your radio. In other words, only you can answer that question.
That said, by far, THE single most important feature to have on a radio is the Roger Beep - because without it you will never be able to draw-out all the Sad-H.A.M.s and laugh at them when they start crying about hearing your Roger Beep.

The best and most important functions to have on a radio are the ones that are most important to you and allow you to do whatever you want to do with your radio. In other words, only you can answer that question.
That said, by far, THE single most important feature to have on a radio is the Roger Beep - because without it you will never be able to draw-out all the Sad-H.A.M.s and laugh at them when they start crying about hearing your Roger Beep.

Sir, the term "CCR" is racist and moolahphobic.

Be careful!!1 I have read that the rubicon guy is just a shill for cheap chinese radios and will say anything the manufactures tell him to say!!!1
I know it must be true because the people that say that have been licensed ham radio operators for 20+ years, it says so right in their forum signature!!1

Imagine living a life where you get so angry and butthurt over videos that nobody forces you to watch, that you then go around complaining and making up stories every chance you can..
We should all pray for sad people like this.

Based on my tests of both radios, they absolutely will talk virtually the same fars.

Sir, the term "CCR" is racist and moolahphobic.

I was going to say "UV-5R" but didn't want any heads to explode.

Sir, the term "CCR" is racist and moolahphobic.

The best and most important functions to have on a radio are the ones that are most important to you and allow you to do whatever you want to do with your radio. In other words, only you can answer that question.
That said, by far, THE single most important feature to have on a radio is the Roger Beep - because without it you will never be able to draw-out all the Sad-H.A.M.s and laugh at them when they start crying about hearing your Roger Beep.

The best and most important functions to have on a radio are the ones that are most important to you and allow you to do whatever you want to do with your radio. In other words, only you can answer that question.
That said, by far, THE single most important feature to have on a radio is the Roger Beep - because without it you will never be able to draw-out all the Sad-H.A.M.s and laugh at them when they start crying about hearing your Roger Beep.

Based on all of the detailed information you have provided, I would say "probably a lot of things"

The best and most important functions to have on a radio are the ones that are most important to you and allow you to do whatever you want to do with your radio. In other words, only you can answer that question.
That said, by far, THE single most important feature to have on a radio is the Roger Beep - because without it you will never be able to draw-out all the Sad-H.A.M.s and laugh at them when they start crying about hearing your Roger Beep.

The best and most important functions to have on a radio are the ones that are most important to you and allow you to do whatever you want to do with your radio. In other words, only you can answer that question.
That said, by far, THE single most important feature to have on a radio is the Roger Beep - because without it you will never be able to draw-out all the Sad-H.A.M.s and laugh at them when they start crying about hearing your Roger Beep.

Just FYI - Prepare yourself for all the "experts" that are going to tell you that antenna location "won't work".. Just ignore them.  It is true, that location wont work "the best it can be", but it will work just fine for trail comms. On both my jeeps i have the antenna mounted just about a foot to the left and I can get 30+ miles simplex and i have hit a repeater at 93 miles - that should be plenty "good enough".
When mounting on the tailgate like that you should run a grounding strap (not a 'wire') from the antenna mount to the tub of the Jeep - make sure the connections are metal to metal. You can use any UHF coax - try to keep it as short as possible but if you have a foot or two extra, just loosely coil it up. Ignore the "experts" that tell you this will make your antenna/radio "not work". Be aware that the Diamond NR7900A is not a GMRS antenna - unless you are also planning to transmit on the ham bands, I would recommend getting an antenna made/tuned for GMRS antenna - I use the Midland MXTA26 You will probably also need an NMO mount to connect the antenna to the bracket, like this: https://www.amazon.com/Assembly-Connector-Adapter-Connect-Vehicle/dp/B0BLMHJ338/ You may also need some kind of SMA to SO-239 connector to connect the BoofWhang to the antenna cable - something like this: https://www.amazon.com/Bingfu-Antenna-Adapter-Coaxial-Kenwood/dp/B083D5TMKG/
But check the gender on both ends to make sure you get the right one for your radio - and get a couple of them because they tend to wear out. I'm sure i'm missing something, but this should get you started.

Based on all of the detailed information you have provided, I would say "probably a lot of things"