Garmin RINO 520 Owner's Manual - Page 20
Setting the Channel and Code, Tone Controlled Squelch System or CTCSS allow
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Unit Operation > Radio Page Setting the Channel and Code The Rino 520/530 has a total of 22 channels (not including GMRS repeater channels) and 38 codes to select from using the Channel and Code fields. Channels 1-7 and 15-22 are GMRS channels, 8-14 are FRS channels, and 15R-22R are GMRS repeater channels (repeater channels are available on U.S. units only and are disabled by default). To communicate with other Rino and FRS/GMRS users, you must be on the same channel and code. Garmin Rino units work with 3rd party FRS/ GMRS radios, provided the other radios use standard FRS/GMRS frequencies. A chart of Rino frequencies may be found in the "Appendix." Squelch codes allow you to hear calls from only specific persons. Thirty-eight (38) Codes (called Continuous Tone Controlled Squelch System or CTCSS) allow your Rino 520/530 to ignore unwanted calls from other persons using the same channel. Simply select the same code (number) as selected by the other person(s) with which you plan to communicate. 10 Select from FRS 8-14, GMRS 1-7 & 15-22, and 15R-22R GMRS repeater channels (with Repeater Channels enabled). NOTE: Codes do not cause your conversation to be private. They only allow you to filter out other users on the same channel, so you only hear the radios you want to hear. Codes on are not a scrambling system! Refer to the section on Voice Scramble operation. Rino® 520/530 Owner's Manual