Aids to Marine Navigation, Buoys, AIS, AtoN | Tideland Signal Tideland Signal is leader in engineering and providing aids to navigation for ports and harbours and offshore structures all over the world. Tideland Signal provides marine solutions including rotationally moulded polyethylene buoys, fog signals, fog detectors, solar power systems, lanterns, beacons, marine lights, racons, remote monitoring systems and vessel traffic monitoring and information solutions.