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You have to make sure that they are using the NZ/Aus frequencies which are different to other countries.

These units cover a much greater frequency range than just the usual frequencies used by the common radios in NZ and Aus but it can be programmed to use just the usual frequencies. You can set it to...

Those can usually be programmed to whatever channels you want. Pretty sure you can set the non PRS as receive only or delete them.

Ummm, the PRS bands that are used by Garmin, Motorola, GMS, .... are UHF bands. If you want real distance the old school AM stuff has much greater range, 50km or more (sometimes 1000km), but these...