Scan Mode and Scan Groups

Scan mode lets your radio automatically step through a list of channels, pausing when it finds activity. It's the fastest way to find who's talking on GMRS without manually flipping through channels one by one.

How scanning works

When you start a scan, your radio cycles through its programmed channels at high speed — typically checking each one for a fraction of a second. If it detects a signal (someone transmitting), it stops on that channel so you can listen. Depending on your settings, it resumes scanning after the transmission ends or after a set delay.

Scan types

• Carrier scan (carrier squelch): stops on any channel where a signal is detected, regardless of CTCSS/DCS tone. This catches all activity but also stops on interference, noise, and transmissions not meant for you
• Tone scan (CTCSS/DCS scan): only stops on channels where the received signal carries a matching CTCSS or DCS tone. This filters out unwanted traffic and interference — your radio only pauses for signals directed at your group. See CTCSS/DCS for details on tone coding
• Priority scan: designates one channel as "priority." While scanning other channels, the radio periodically jumps back to check the priority channel for activity. If something comes in on the priority channel, it takes precedence. Useful for keeping a repeater as your primary while scanning other channels

Scan groups and channel lists

Most radios let you choose which channels to include in the scan. You can skip channels you're not interested in — like unused repeater inputs or channels you know are inactive in your area. This makes the scan faster and reduces unwanted stops.

1. Add/skip per channel: mark individual channels as included or excluded from scan
2. Scan groups: some radios support multiple scan lists (e.g., "local repeaters," "travel channels") that you can switch between
3. Full scan: scans every programmed channel. Comprehensive but slow and stops on a lot of noise

Scan resume modes

When the radio stops on an active channel, what happens after the transmission ends?

• Time-operated (TO): resumes scanning after a fixed delay (usually 5–10 seconds of silence)
• Carrier-operated (CO): resumes as soon as the signal drops — immediately starts scanning again when the channel goes quiet
• Search hold: stays on the channel until you manually resume the scan. You keep full control

Scan vs dual watch

If you only need to monitor two specific channels, dual watch is faster and more reliable because it only alternates between two frequencies. Scan is better when you want to sweep across many channels or find activity you didn't expect. For day-to-day use, many operators set up dual watch on their two most important channels and use scan occasionally to see what else is active in the area.