Source seaport.nas

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setlistener("/sim/presets/latitude-deg", func {
    logprint(LOG_INFO, "*** NEW LOCATION ***");
    settimer(func {
        var typ = getprop("/sim/type");
        var lat = getprop("/position/latitude-deg");
        var lon = getprop("/position/longitude-deg");
        var g = geodinfo(lat, lon);
        if ((g != nil and g[1] != nil and g[1].solid) and (typ == "seaplane") )
            fgcommand("dialog-show", props.Node.new({ "dialog-name": "seaport" }));
    }, 8);
}, 1);