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Rich, all GMRS repeaters have a +5 MHz offset. For example, a repeater on 462.675 will require your radio to transmit on 467.675 as well as the required CTCSS (PL) tone to access it. Repeaters are by definition "half-duplex" since they use separate transmit and receive frequencies. They are called half-duplex because your radio cannot transmit and receive at the same time. A cellphone or landline phone are "full-duplex" since both ends can talk and listen simultaneously. If you use only one frequency, then it is known as "simplex" since you have to take turns talking! GMRS repeaters are no different that any of your local 2m or 70cm ham repeaters. In that respect it is considered bad manners to use the repeater's transmit frequency for simplex operations.