TAFLRF

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ISED Canada TAFL

Location Search

⚠ Address lookup leaves this machine. The text you type and this machine’s IP go to OpenStreetMap’s Nominatim service, which receives and may log them — HTTPS protects them in transit, not from Nominatim. Entering lat,lon above, or clicking the map, does not contact the geocoder — the search itself still sends those coordinates to whatever server is running this app, which is what the status below reports.

Tiles are fetched from OpenStreetMap as you pan, so they reveal the area you are viewing — at building precision once zoomed in, whether or not you used the address lookup. Turn them off to make no tile requests at all: pins, emitters, beam wedges, the radius circle, a scale bar and a lat/lon grid all still render. That stops the tiles, not the app — the page and every result in it still come from the server named below.

What leaves this machine

    Or click the map to drop a pin.

    Filters

    Applies to ISED TAFL transmitters only — a TAFL field with no equivalent in the FCC registries.

    Applies to every layer with a registered frequency, Canadian and US. Four layers are not filtered; an export names which, and why.

    Applies to ISED TAFL transmitters only — these are ISED service IDs; the FCC layers are selected by their own toggles below.

    Canada ISED
    Cell Sites Canadian sites: ISED Terrestrial Spectrum Licence Site Data. US sites: FCC ULS cellular (l_cell) — public domain. US sites are a location + band layer. A licensed ERP (and so a modelled signal in TSCM mode) is on file for only ~17% of US sites. The rest show as unknown power — which is not the same as no emission.
    ISED Terrestrial + FCC l_cell
    Satellite Earth Stations
    ISED Satellite Site Data
    6 GHz Fixed Links AFC
    ISED AFC Stations Data Extract
    Amateur Operators by FSA Aggregate operator counts per Forward Sortation Area — no individual locations. FSA centroids © GeoNames (CC-BY).
    ISED Amateur Radio Operators
    Registration Changes monthly diff New / modified / removed licences between ISED TAFL releases — a removed emitter's silence is expected; a still-active one near a change is worth a look.
    New Modified Removed
    United States FCC
    Antenna Structures ASR US antenna structures (towers) — location and height only. No RF power is registered, so these are never given a modelled signal and are never filtered out by signal strength.
    FCC ASR — public domain
    Microwave US fixed point-to-point microwave emitters — modelled signal (FSPL + building) in TSCM mode.
    FCC ULS l_micro — public domain
    Land Mobile US land-mobile (LMR) fixed-location emitters — modelled signal (FSPL + building) in TSCM mode.
    FCC ULS l_LMcomm + l_LMpriv — public domain
    Maritime Coast US coast, marine-utility and shore radionavigation stations (47 CFR Part 80) — marine VHF and HF SSB, modelled signal (FSPL + building) in TSCM mode. Ship stations are not included. The FCC dump carries no location or frequency record for them, so their absence here is a data gap, not an all-clear.
    FCC ULS l_coast — public domain
    Aeronautical US airport, air-traffic and navaid ground stations (47 CFR Part 87) — control towers, UNICOM, ATIS/AWOS, ground control, ILS localizer and glide path, VOR, NDB and airport radar; modelled signal (FSPL + building) in TSCM mode. Navaids and weather loops are flagged continuous; towers and test benches intermittent. Aircraft stations are not included. The FCC dump carries no location or frequency record for them, so their absence here is a data gap, not an all-clear.
    FCC ULS l_coast — public domain
    Paging / Public Mobile US Part 22 public-mobile land stations — paging base stations plus rural, offshore and general-aviation air-ground radiotelephone; modelled signal (FSPL + building) in TSCM mode from a registered ERP. Paging transmitters are licensed to as much as 3500 W ERP at 931–932 MHz (47 CFR 22.535), which makes them among the strongest fixed UHF emitters near most sites — worth accounting for before anything nearby is called anomalous. Duty cycle is reported intermittent: a pager keys for traffic, and nothing cited supports calling its carrier always-on.
    FCC ULS l_paging — public domain
    Earth Stations IBFS US licensed satellite earth stations (47 CFR Part 25) — VSAT hubs, gateways, teleports and TT&C sites. Transmitting stations get a modelled signal (FSPL + building) in TSCM mode from a licensed EIRP. Frequencies are licensed band edges, not a measured centre. About three-quarters are receive-only and radiate nothing: those are drawn as hollow diamonds, badged RX-only, and carry no modelled signal — a large dish is a real installation worth knowing about, but it is not an emitter.
    FCC IBFS — public domain
    Broadcast AM/FM/TV US AM / FM / TV broadcast facilities. FM and TV carry a licensed ERP — modelled signal (FSPL + building) in TSCM mode. AM has no valid signal model — it is MF ground-wave, which FSPL does not describe. AM facilities are kept and shown without a modelled level, and are never filtered out as if they were RF-clear.
    FCC LMS — public domain
    Amateur Operators by ZIP Aggregate licensed-operator counts per 5-digit ZIP with an operator-class breakdown — no individual locations, names or addresses. ZIP centroids: US Census ZCTA Gazetteer (public domain).
    FCC ULS l_amat — public domain
    Licence Changes FCC diff New / modified / removed US licences between two captured FCC releases — a removed emitter's silence is expected; a still-active one near a change is worth a look. These are licences, not individual registrations. One FCC licence covers many emitter rows — 12.6 on average for microwave — so one marker here stands for the whole set, unlike the ISED changes layer where a marker is one registration. Cellular is keyed per site instead, because a cellular licence spans a 123 km market at the median.
    New Modified Removed

    Applies to ISED TAFL transmitters only — an ISED authorisation status. The US layers already keep only active licences at ingest.

    Applies to TAFL, US maritime and US aeronautical — the layers that record whether the plotted point is an antenna position or the centre of a licensed operating area. Over half of TAFL is the latter. Other layers are unaffected and keep returning every row.

    Model the received level inside a structure; drop emitters whose modelled level cannot reach the threshold

    De-weight a directional emitter by its 3GPP off-axis pattern toward the pin (transmitters with a main lobe only).

    De-weight by ITM terrain diffraction over the DEM path to the pin. Computed on demand for this location (in the background); emitters off the DEM or outside ITM's 20 MHz–20 GHz band fall back to free-space.

    Elevation: SRTM (NASA/USGS), 20 MHz–20 GHz. Terrain is a planning estimate, not a guarantee of (non-)detectability.
    Site Calibration

    Corrects a shared site bias, not per-path error — only as good as the reference emitter's own ERP. Clamped to ±20 dB.

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