Halcyon · Coastal Data & Comparison Tool (v0.8.23)

Find your location

Search place name or address

- or enter coordinates -

Latitude

Longitude

Site name (optional)

Demo location

Search radius 10 mi

Larger radius = more reference stations, less local precision

What to measure

Primary parameter

Astraeus device not connected

Pull live GPS + water temp from your Supabase feed.

Device

Look back for location fix

ETL log

Waiting for location…

Drop pin

Click map to set location

Available sources 0 found

CHIP LEGEND

● direct API · works from your browser today

● needs server · valid data, but blocked by CORS without a backend proxy

● modeled / partial · use with caution

● no data for this parameter · skip these

tap { } API on any source to see the actual endpoint and how the response is parsed

Set location first to discover sources

0 selected

Legend

Your location

NOAA CO-OPS

NDBC buoy

USGS NWIS

Open-Meteo

Needs proxy

Reference stations 0

YOUR DEVICE · -

24H LOCAL

Source	Type	Value	Distance	Δ device	Trend	Link
Fetch data first

Legend

Device (local)

NOAA CO-OPS

NDBC

Open-Meteo

Posidonia meadow (A5.535*)

Field read: water (07-01)

Field read: air

Field read: bad

Warm anomaly

Cool anomaly

Expected vs reading - observed minus expected

Fetch a modeled source and field reads to see the variation.

Expected values are modeled (grid), interpret with caution. Green tick = mean of trusted field water reads. Amber dashed = operator-edited (low veracity), excluded from the mean.

Trend - -

Series