Answers to the questions I get asked most. Don't see yours here? Use the Contact page — I read everything and I'll add it if it's a common one.
That delay is normal and expected. It comes from a combination of the SDR decode process and the audio buffering Icecast (the streaming server) does to keep playback smooth over the internet. It's not a bug and it's not something that can be tuned away without sacrificing stream stability.
Because of that delay, NCISS is not suitable for emergency response coordination. If you need emergency services, call 911.
This usually happens on conventional VHF channels rather than the P25 trunked system. Greene County Fire/EMS paging, for example, runs on a conventional VHF frequency — and VHF fire paging frequencies get reused all over Iowa, since their normal range is only 20–40 miles.
Under the right atmospheric conditions — a temperature inversion, high pressure, certain moisture layers — VHF signals can travel much farther than usual, sometimes 100+ miles over flat terrain. Hams call this tropospheric ducting, or "skip." When it happens, a scanner sitting on a shared VHF frequency can briefly pick up a distant agency using that same channel, even though you'd never hear them on a normal day.
So if you catch a county that seems out of place, it's very likely a distant transmission riding a temporary atmospheric skip on a reused frequency — not a NCISS error.
NCISS only decodes and streams unencrypted transmissions. Encrypted talkgroups are listed on the Signals page so you can see the full scope of what's on a system, but they are never intercepted or decoded — that's not something NCISS does, and it's not legal for a hobbyist monitoring station to do.
Maybe. If it's a talkgroup that's reachable from the sites NCISS already monitors, members can request a private custom feed built around the specific talkgroups they want to hear. Custom feeds are built manually, usually within 48 hours of request. See the About page for details, or reach out through Contact.
Yes. Monitoring public safety radio frequencies is lawful under federal law for receive-only hobbyist use. NCISS is passive receive-only — nothing is ever transmitted, and content isn't retransmitted for commercial purposes. Encrypted talkgroups are never decoded.
No. NCISS is an independent hobbyist operation with no relationship to Iowa DPS, any county, or any municipality. It's operated by a scanner enthusiast and ham radio operator, built and run from Greene County, Iowa.
Free listening gets you full access to every public stream, live, 24/7 — no account needed. Members get a 7-day recordings archive and can request a private custom feed built around the exact talkgroups they want. NCISS carries no advertising and no trackers; membership is what keeps the lights on.
Not entirely, and it's not trying to. A traditional scanner still wins on portability, mobile use, and instant-on — if you're listening from your truck, a scanner is the right tool. NCISS is built for listening at a desk or on your phone when you want to catch everything happening across multiple talkgroups at once, without needing to own or program dedicated scanner hardware.