Suitable for medium size vessels. Polyethylene case. The EM 230 model has been successfully tested by QinetiQ to ISO 8729, SHIPS WHEEL MARK, SOLAS RORC and ORC and meets sections A.1/1.33 and A.1/4.39 of annex A1 of Marine Directive 98/95/EC.Mast, halyard or deck bracket mount.