Acknowledgements

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Weather forecasts and current atmospheric conditions for Calm planning and geo context. The sailing layer also reads its hourly 10 m wind (speed, direction, gusts, in knots) on a small grid over the viewport for the wind-arrow overlay and the tacking planner, and the air-temperature heat map reads its current 2 m temperature on the same kind of grid.

Seasonal climate normals used for planning windows beyond short-term forecasts; the same ERA5 archive gives Scout's Conditions timeline the last year's monthly mean air temperature, drawn against the PRISM normal, and the sailing Passage timeline the last year's monthly mean wind and its prevailing direction.

Sea-surface temperature for marine and coastal sessions; surface currents (Météo-France SMOC), waves and swell for the sailing chart's Water layers and for timing each board of a planned passage over the ground.

Tide predictions (at the nearest of the ~3,500 stations NOAA predicts for — reference gauges and subordinate stations alike, from the metadata API's tidepredictions list — with the gauge's measured level where the station has one), coastal water timing, and measured station water temperature (water_temperature product) used in Scout guidance + the Activity model's temperature term; the same readings, at every tide station with a temperature sensor in view, are points of the water-temperature map's current conditions and bend the estimate around them. Tidal current predictions (currentpredictions product: max flood/ebb speed and direction at ~600 New England stations) give the Current & Structure overlay its saltwater velocity — interpolated onto the channel network by the tile pipeline as `hydraulic_flow` / `hydraulic_station` — and the station datums behind the tidal bands. In Scout's sailing lens the nearest current-prediction station to the reading point (station list from the metadata API; currents_predictions at MAX_SLACK: the times and speeds of maximum flood, maximum ebb and slack) draws the Current card's curve and slack times and the Passage timeline's current track, and a tide station's datums (NAVD88 against MLLW) tie the surveyed bottom to chart datum for Under the keel where VDatum does not answer.

The latest observation from every NDBC buoy and coastal C-MAN station, one file for the whole network. Its water temperature (WTMP) is a point of the water-temperature map's current conditions wherever a buoy or station reports it, and bends the estimated field around it.

Hydrodynamic model (ROMS, ~700 m) of the Gulf of Maine and southern New England shelf. A harmonic fit to fifteen days of its hourly surface currents gives the current-heat overlay its average peak tidal current across open water and the sounds from Rhode Island to Maine; the NOAA current stations then correct it locally and cover the harbours it does not resolve.

Hydrodynamic model (POM) of New York Harbor, Raritan Bay and the lower Hudson, on a harbour-wide grid and a fine grid of the Upper Bay. The same fifteen-day harmonic fit as GoMOFS gives the current-heat overlay its tidal current in the harbour; the model stops at the harbour's approaches, so Long Island Sound and the ocean shores beyond it are left unpainted rather than guessed.

Hydrodynamic model (ROMS) of Delaware Bay, the tidal Delaware to Trenton and the New Jersey and Delmarva shelf. Its hourly surface currents, fitted over fifteen days, give the current-heat overlay its tidal current for the bay and the southern New Jersey coast.

Daily 1 km satellite sea surface temperature analysis (MUR v4.1): under "current conditions" it replaces the estimated water temperature over the sea, pixel for pixel, in Scout and the map lab on the shared 32–86 °F scale. Served as values by NOAA CoastWatch's ERDDAP and proxied by the app.

River flow, water temperature, and gage-height observations for freshwater conditions (the Water Data OGC API's latest-continuous collection, with the legacy instantaneous-values service as fallback). The nearest active flow gauge to a point is found the same way, named from the API's monitoring-locations collection, with the legacy site service as fallback. The water-temperature map draws every gauge in view reporting within the day with its live reading as the measured truth over the estimated field, and bends the estimate around each gauge by the reading's difference from it.

National stream-reach geometry (NetworkNHDFlowline) — the provider reserved for the deferred per-waterbody freshwater likelihood layer in Scout.

Native and introduced ranges by HUC8 watershed for the freshwater fishes of the United States. Ingested into fish_native_ranges for the watershed-grain freshwater range overlay, and read by the tile pipeline as the range gate of the species activity map: a watershed with a GAP record of the species (native or introduced) is its range, and fresh water in a mapped watershed without one is held to the same 0.12 the app applies to an introduced-not-stocked species.

Spatially-referenced occurrence records for introduced freshwater fish, aggregated to HUC8 watersheds (joined to WBD boundaries) and baked DB-free to a PMTiles range fill. Drives the Scout 'Introduced (NAS)' overlay — the only range surface for species with no native range here (brown trout, stocked rainbows) — and, through the NAS API, adds the watersheds where a species-activity species has turned up since the GAP ranges were drawn to the range gate of the species activity map (tile-pipeline/scripts/acquire/fetch_nas_occurrences.py).

Species habitat summaries (preferred depth, substrate, current, vegetation) curated into the per-species habitat-preference table that feeds the fused 'Activity' likelihood model's habitatMatch term. Combined with state fisheries habitat profiles.

Live occurrence-density map tiles (GBIF Maps API) streamed client-side to drive the Scout 'Observed density' freshwater overlay — where a species has actually been recorded, hex-binned by count — and, through the occurrence search API, the georeferenced records of each species-activity species in every region of the map (the six New England states, New York, New Jersey, Pennsylvania) that the tile pipeline turns into the population-evidence term of the baked species habitat (a kernel density of where the fish has been recorded, graded so a lone photo is faint and a known fishery is full, and floored so unsampled water is not read as absent). Complements the curated native (Aquatic GAP) and introduced (NAS) range fills. Records carry their publishers' licences (CC0 / CC BY / CC BY-NC by dataset).

The daily trout stocking record behind MassWildlife's stocking report (waterbody, town, species, date — the ArcGIS table StockedFish_View) and the stocked waters themselves (Trout Stocked Lakes and Centroids, MA stocked streams). Ingested monthly into stocking_events with coordinates from the centroids; the tile pipeline reads the stocked-water polygons and the season's events as population evidence for the species activity map — a water stocked with brook trout this year is a known place to find one.

Stream segments with a documented reproducing coldwater fish population, predominantly brook trout (GISDATA.DFWCFR_ARC, fetched from MassGIS's GeoServer as GeoJSON). The tile pipeline uses them as population evidence for the brook trout channel of the baked species habitat: water within 300 m of a documented segment carries full evidence, so a favourable brook with a known population reads above one without.

Patches — groupings of catchments — with documented wild brook trout occupancy across the species' eastern range, the joint venture's 2024 assessment (EBTJV code, catchment count, area, patch composition, brook trout proportion, state). The tile pipeline reads them as population evidence for the brook trout channel of the species activity map in every region: water inside an occupied patch carries the same 'documented population' evidence as a Massachusetts coldwater-fisheries segment, so a favourable brook in a patch reads above one outside it.

The lakes and ponds designated under Title 12 §12461 as State Heritage Fish Waters: waters holding eastern brook trout or Arctic charr that have never been stocked, or not for at least 25 years (Maine Office of GIS map service). Population evidence for the brook trout channel of the species activity map in Maine — a designated self-sustaining fishery reads as a known one.

The stream reaches CT DEEP manages as Wild Trout Management Areas (from the Fisheries Management Areas set on the DEEP GIS Open Data site): Class 1 waters reproduce enough wild trout to fish year-round, Class 2 partly. Population evidence for the brook trout channel of the species activity map in Connecticut, at the same weight as a documented coldwater segment.

National hydrologic-unit (HUC) boundary polygons — the watershed geometry the NAS occurrences are joined to for the introduced-range (HUC8) fill, the basis for the freshwater native-range overlay, and (HU2 regions 01, 02, 04 and 05 clipped to the map) the watersheds the tile pipeline rasterizes the species activity map's range gate on (tile-pipeline/scripts/acquire/fetch_wbd_huc8.sh).

Historical flow normals used for seasonal planning and comparisons.

Elevation samples used for terrain-aware guidance and route context. The hiking lens's Trail pane reads the ground along a trail from the same 3D Elevation Program through its elevation ImageServer (getSamples over the trail walked out to a few hundred points, the 1 m lidar where flown): the elevation profile, climb and descent, grade and walking time.

Bathymetry tiles and derived contours used for coastal and marine map overlays. Scout's sailing lens reads the surveyed bottom at one point for Under the keel — its elevation (current US vertical datum, NAVD88 in the lower 48) and vertical uncertainty from the BlueTopo bathymetry layer (nowCOAST WMS GetFeatureInfo, bluetopo:bathymetry). NOAA states BlueTopo is not for navigation; the card says so.

3 arc-second lake-floor grids for Lake Erie (with Lake St. Clair) and Lake Ontario. The Coast Survey map stamps them into the lakes for the freshwater depth tint and bands, and the optional enhanced-bathymetry overlay cuts 1 m depth contours and a lake-bottom hillshade from the same depths.

Depth soundings digitized from NOAA charts of Lake Champlain, gridded into the lake's floor for the Vermont and New York map regions: the freshwater depth tint and bands, and the enhanced-bathymetry overlay's lake contours and hillshade.

Surveyed pond and lake depth contours in Massachusetts. Interpolated into each surveyed pond's floor for the freshwater depth tint and bands, and contoured at 1 m with a bottom hillshade in the enhanced-bathymetry overlay.

Depth contours for New Hampshire lakes surveyed by NHDES and NH Fish & Game. Interpolated into each surveyed lake's floor for the freshwater depth tint and bands, and contoured at 1 m with a bottom hillshade in the enhanced-bathymetry overlay.

Depth contours for Connecticut reservoirs, lakes, ponds and coves. Interpolated into each surveyed waterbody's floor for the freshwater depth tint and bands, and contoured at 1 m with a bottom hillshade in the enhanced-bathymetry overlay.

Bird frequency and notable sightings used in habitat, birding context, and the Endurance Capture seasonal species picker; in Scout's birding lens, eBird's hotspots (ref/hotspot/geo: each hotspot's species all time and last checklist) drawn on the map, and at the reticle the nearest hotspots and the notable sightings of the last two weeks within 25 km (data/obs/geo/recent/notable).

Species observations used for ecological and place-based natural history context, and — research-grade sightings within 15 km, by month and week of the year (observations/histogram, observations/species_counts) — the Scout birding lens's bird frequency, its Moving through rows and the month's commonest birds; its map tiles (grid and points, in the clock's month) as the "iNaturalist observations" layer (birds on the birding lens, all life on the hiking lens) and, filtered to flowering plants, the hiking lens's "In bloom" layer; and the species seen near the reticle (the PlaceCard's Seen here); for the hiking lens, in a box around the trail, each wildflower's flowering sightings by month (the "Flowering" annotation) for its bloom calendar, what is seen there by kind in the month, and when each kind is out.

Flood-zone overlays used in site and risk context.

Walkability and urban-form metrics used in urban and architectural context.

Demographic context used for neighborhood and place interpretation.

Wetland polygons with Cowardin codes. The map's wetland layer, and the activity grid's aquatic-vegetation term: estuarine/lacustrine aquatic bed (eelgrass, submerged vegetation) and emergent marsh read from the NWI ATTRIBUTE code per cell.

30 m land cover (2021/2024). The map's vegetation layer is classified from it, and the activity grid reads that class at each water cell as shoreline cover for the habitat term.

Nearby building context and map features used in site interpretation. The sailing layer queries it for harbours, marinas, chandleries, sailmakers, fuel docks, lighthouses and the pubs within walking distance of a marina; the same sailing query harvests those places into the shared craft-site corpus behind Scout's Local pane for the sailing craft (marinas and launches, clubs, anchorages, fuel, pump-out, the harbourmaster, ferries, chandleries, sailmakers, boatyards, provisioning, sailors' pubs, waterfront tables, maritime museums, lighthouses, showers, rescue stations), with their OSM notes (VHF, fuel, moorings). The birding craft's refuges and sanctuaries are harvested the same way: every named nature reserve and protected area (relations included) ranked by extent. Queries are spread across the public mirrors at overpass-api.de, overpass.kumi.systems and overpass.private.coffee, all serving the same OpenStreetMap data.

Official US nautical chart raster (nowcoast:enc WMTS) proxied as the nautical chart overlay in Scout and on the Glaukas sailmaker chart — charted depths, contours, aids to navigation and restricted areas in NOAA symbology. The S-57 ENC cells themselves are the input to the nautical vector tile build.

Vertical datum transformation (VDatum REST convert). For Scout's sailing lens, where NAVD88's zero sits above mean lower low water at the reading point, so BlueTopo's surveyed bottom reads as a charted depth below MLLW and the predicted tide (on MLLW) adds straight to it for Under the keel's water and clearance. One call per ~1 km cell, cached.

The Electronic Navigational Charts as ArcGIS map services by usage band (harbour, approach, coastal). Scout's sailing lens asks them, at one point, for the chart's depth area (DRVAL1–DRVAL2 below MLLW), a dredged area's maintained depth, land, and the nature of the bottom (seabed areas, else the nearest charted bottom note within 800 m) for Under the keel. NOAA states the service is not intended for navigation; the card says so.

Worldwide buoys, beacons, lights and harbour marks rendered from OpenStreetMap seamark tagging. The nautical-chart base map option and the sailing nautical chart overlay draw it over the survey bathymetry.

Walk, transit, and bike scores used for urban mobility context.

Road congestion and flow context used for urban timing and route conditions.

Static map images for saved and recommended locations in entry context and the Inspiration pinboard.

The water-shaded ground beneath the Coast Survey basemap wherever the tile pipeline has no coverage, and the satellite imagery under the survey's satellite look. The Survey in Scribbles, its board thumbnail and its freeze snapshot draw the same style Scout and the Glaukas chart draw.

The worldwide roads, water, land use and place names the Coast Survey basemap is styled from outside the tile pipeline's own archive — served by OpenFreeMap, or by MapTiler when a key is set. Every Survey surface in Scribbles reads them through the shared style.

The raster fallback the Survey's board thumbnail and freeze snapshot draw only where the Coast Survey basemap cannot be rendered (no WebGL), and Scout's plain street base.

Reverse geocoding used to label GPS-selected locations in endurance and scribble flows.

Place search and venue context used in Slate suggestions and geo guidance.

Nearby and text place search used in location discovery and suggestions.

Recreation areas and facilities used in outdoor location suggestions.

Native vs. introduced status for freshwater game fish, used to colour stream reaches in the Scout freshwater overlay.

State fish-stocking records (waterbody, species, quantity) used to distinguish stocked from wild freshwater populations in Scout.

Authoritative state boundaries used to partition the Coast Survey map. Each build region processes a buffered area for context but emits only the non-overlapping core it owns, so the states merge into one archive with nothing drawn twice. Open water is allocated to the nearest state's boundary rather than clipped away, which is what keeps offshore bathymetry and the tidal bands intact.

Destination and local place context used in travel and location guidance.

Structured place and entity lookup used in location search.

Regional hatch timing for common trout-stream insects (mayfly, caddis, stonefly, midge) — season, water-temperature and growing-degree-day emergence windows, life stages, and matching fly patterns. Seeds the entomology forage stamps.

Thirty-year monthly mean air temperature normals. The tile pipeline's estimated water-temperature layer is driven from them: stream temperature by the Mohseni logistic of monthly air temperature with a groundwater pull by stream order, lake surface temperature by a depth-dependent lag, estuaries by a blend with the satellite sea temperature. The app shifts the estimate live by today's air temperature against the same normal. Products derived from these data acknowledge the PRISM Climate Group at Oregon State University.

Vetted category-level, taxonomic-family, and exact-species silhouettes imported from PhyloPic into local assets and uploaded to Supabase Storage for ecology imagery, including structured coastal marine mammal, seabird, shellfish, and forage-fish coverage.

Curated reference profiles for 289 gamefish, forage fish, invertebrate/amphibian prey, and salmonid subspecies/hybrids — temperature preferences, habitat, seasonal peak months by region, fly/lure matches, a species-relationship graph (subspecies, life-history forms, color morphs, hybrids), and curated native/introduced + historic-range / migration-corridor / thermal-limit facts. Compiled from public fisheries science (FishBase, NOAA/MRIP & NOAA Fisheries, USGS NAS, ASMFC, Bonefish & Tarpon Trust, Western Native Trout Initiative, and peer-reviewed literature) with editorial synthesis; powers the seasonal food-web, target-species, and unified range/activity models.

The regional .osm.pbf extracts the Coast Survey map is built from: roads, railways, buildings, parks and trails in the tile pipeline's human layer, and the dams, weirs and lock gates that end the tide in the current heat overlay (water behind one is routed as a pond, not an estuary).

Locally stored world heritage records used in search and place suggestions.