GMRS is kind of informal compared to ham radio. You can use call signs and many do like "WRFS930 base to mobile" when I call my wife, Or I can just say " Jean got your radio on". You do need to give your call sign. The FCC rules say "(a) The GMRS station call sign must be transmitted: (1) Following a single transmission or a series of transmissions; and, (2) After 15 minutes and at least once every 15 minutes thereafter during a series of transmissions lasting more than 15 minutes"
There are a lot of GMRS repeaters in the Las Vegas area, around 15 or so last time I looked. Most are for local coverage like the one here in Dolan covering about 20-30 miles, but several like the Rat Repeater on 462.675. It sets high on Mt Potosi at 8750 feet. The link shows a map of the estimated coverage of the Rat Repeater and I can hit it with a handheld from 9th and Pierce Ferry Rd.
This is the same frequency as my repeater but we use different tones, so don't be surprised if you hear people in Vegas talking when you're in Dolan.
The Dolan Springs repeater covers from around milepost 32 to milepost 51 on US93. It's on 462.675+ 5 Mhz, that means you receive on 462.675 and transmits on 467.675, a 100.0 hz subaudible tone that's required to open the repeater.
The MyGMRS.com page has lots of information like this map of GMRS repeaters or the Repeater Directory where you can search for repeaters by state and shows a map of estimated coverage for the repeater. More on emergency service NETS and high tech stuff like internet linking of repeaters for regional or state coverage too.
Arizona GMRS Repeater Club Tucson AZ has lots of great info on GMRS repeaters, radios, and more...
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