I am pretty sure that the Industrial/Business pool is not the same as the Business Radio Service. The I/B pool is more of a category of how licensees are filed and coordinated. The Business Radio Service may be a subset of the I/B pool but BRS, like GMRS, MURS, and FRS, are compartmentalized (or more specifically a very strict group of frequencies across the spectrum). In fact the I/B Pool is covered under Subpart C of the FCC's part 90 rules while the Business Radio Service was a section of Subpart D of the same part 90.
While MURS did take some of the itinerant I/B channels, GMRS is probably as old as the UHF I/B Service.
You're exactly right, but again, I think we're confusing the I/B pool of with the now defunct BRS.
I believe the FCC has reserved these services for anyone that already had a license. Somewhere, in the last 10 to 13 years, these "industrial radio services" were removed and anyone that already had a license could keep it (unless otherwise informed by the FCC). The earliest mention of the Business Radio Service that I can find is from 1997 and 1996:
Part 90 - Subpart D, 1996 and 1997:
90.63 Power Radio Service.
90.65 Petroleum Radio Service.
90.67 Forest Products Radio Service.
90.69 Film and Video Production Radio Service.
90.71 Relay Press Radio Service.
90.73 Special Industrial Radio Service.
90.75 Business Radio Service.
90.79 Manufacturers Radio Service.
90.81 Telephone Maintenance Radio Service.
These seem to have been canned by the following adopted FCC rules in 1998.
Another group from the land transportation radio service seems to have also been canned and obviously these would be grandfathered:
90.89 Motor Carrier Radio Service.
90.91 Railroad Radio Service.
90.93 Taxicab Radio Service.
90.95 Automobile Emergency Radio Service.
GMRS is not acceptable for a business as each FAMILY requires a license.
There are grandfathered businesses operating on GMRS from the days when an "organization" could obtain a license.
You're right there as well, and the FCC couldn't make it any more clear but iworms never specified exactly who "We" are so it is possible this may not be a business and could be a community thing which means if individuals have their own licenses then they and their families could use GMRS as a family/community activity such as a few families organizing the theatre, etc; the problem being that this is likely not the case and as n5ims stated, this can be a little pricey but possibly beneficial as the licenses can be used for many other activities.
It is not terribly expensive. Probably cheaper than getting the handful of GMRS licenses you would need to skirt the law on that band.
True, but since the FCC does not issue BRS licenses anymore, they license in the I/B pool based on your business needs and the availability of frequencies so it could be potentially more expensive than GMRS.
My suggestion would be MURS or a I/B license. Too many kids on FRS.
MURS and even short range handheld CB radios would be perhaps very perfect for this. But also, there is the 900MHz unlicensed range and you can find FCC type-accepted digitally coded and encrypted spread-spectrum radios out there that support text messaging. Like these:
TriSquare - 2-way Radio - Beyond FRS Beyond GMRS eXRS (TM) eXtreme Radio Service I have used these radios, briefly, and they are surprisingly nice.