Return weather for one location: marine conditions (wave height/direction/period, swell, sea-surface temperature, ocean currents, sea level, …) plus general atmospheric conditions (air temperature, precipitation, wind speed/direction/gusts, humidity, cloud cover, visibility, pressure, weather code, …). Specify the location as exactly one of: coordinates (lat+lon), a vessel (mmsi/imo/uuid — weather near its last known position), or a port (port_unlocode/port_uuid). Use mode to choose current conditions (default), a 7-day daily forecast, a 7-day hourly forecast, or any combination. Each weather field has a matching entry in the corresponding *_units object.