_setlistener("/sim/presets/latitude-deg", func {
	print("*** 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);