get_tide

fr.solanometeo/solano · Verify this server

High and low water times and tidal range at any point on the globe, and real water heights wherever a national almanac covers it. Two very different answers, and the difference matters: - `reference.kind == "chart_datum"` — a national tide almanac is attached to this point (Canada CHS, France api-maree.fr, Ireland Marine Institute). `height_m` is then a TRUE water height above chart datum, which can be added to a charted sounding. - `reference.kind == "lowest_low_water"` — no almanac here, so the figures come from a global model referenced to mean sea level. Times and ranges are sound (they are differences, the unknown datum cancels out) but `height_m` is NOT a water height: it is an offset above an internal reference. Never add it to a sounding, and never present it as depth. Model range is systematically UNDERSTATED, the more so the more confined the place (-6% Halifax, -20% at the head of the Bay of Fundy): 8 km grid cells do not resonate a funnel. This is flagged, never silently corrected. The almanac attachment for a new point is decided in the background, so the first call at a fresh location may return the model and a later one the almanac.