Photo and data credits

Photos

• Midland WR-120EZ NOAA All Hazards weather alert radio, front view. By Lg q60.avi, source, CC BY 4.0. Resized.
• Communications tower and site lights at blue-hour dusk. By Atomic Taco from Seattle, WA, USA, source, CC BY-SA 2.0. Resized.
• Wall map with pins in an interagency dispatch center. By Region 5 Photography, source, Public domain. Resized.
• Four P25 handheld radios (Kenwood, Tait, Motorola, EFJohnson). By Evan Forester, source, Public domain. Resized.
• Hand holding a Uniden BCD396D handheld scanner. By MamaGeek at English Wikipedia, source, CC BY-SA 3.0. Resized.
• Fire lookout tower carrying Minnesota ARMER (P25) radio relay antennas. By Tony Webster from Minneapolis, Minnesota, United States, source, CC BY-SA 2.0. Resized.
• Midland MXT275 GMRS mobile radio microphone and cable mounted on a car dash. By Amandaschoep, source, CC BY-SA 4.0. Resized.
• Sunset over the ocean from a ship deck railing. By Shelley Steinhorst, source, CC BY-SA 4.0. Resized.
• Parent and child hiking a subalpine trail with packs, seen from behind. By Olympic National Park, source, Public domain. Resized.
• Wildland fire crew member in a pine forest using a radio. By Grand Canyon NPS, source, Public domain. Resized.
• Park ranger seen from behind holding a handheld radio among desert boulders. By Joshua Tree National Park, source, Public domain. Resized.
• Pair of orange Motorola Talkabout T265 radios on a neutral surface. By Urban Versis 32, source, CC BY-SA 4.0. Resized.
• Hand holding a lime-green Retevis RT49P FRS radio. By CaioCastro34, source, CC BY-SA 4.0. Resized.
• Skiers riding a chairlift up a snowy slope, with mountains behind. By Gabriel Santiago (via Unsplash), source, CC0. Resized.
• Wide supercell shelf cloud over open plains (NSSL). By Sean Waugh, NOAA/NSSL, source, Public domain. Resized.
• Supercell with funnel and shelf cloud over a Kansas barn and road. By NOAA National Severe Storms Laboratory, source, Public domain. Resized.

Product photos come from Amazon's product API.

Data

• FCC Universal Licensing System weekly files. Public record.
• US Census Bureau 2020 county boundaries, places and ZIP code tabulation areas. Public domain.
• Product specs: makers' product pages and manuals, quoted and linked.
• National Weather Service NOAA Weather Radio county coverage list (towers, channels, codes and status). Public record.
• FCC equipment authorization grants, read through fccid.io, a mirror of the FCC database.
• Electronic Code of Federal Regulations, Title 47 (FCC rules), Parts 1, 95 and 97.
• RadioNerds, for what each FCC emission code means.
• Range tests by OutdoorGearLab, Outdoor Life, Outdoor Empire and OVR Magazine; cruise line rules from each line's website; encryption news from the outlets linked on the encrypted police page.

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