Raymarine i40 Depth with Thru-Hull Transducer Raymarine i40 Depth System Depth can be displayed in either feet (ft), MS (M) or fathoms (fa) Alarms can be set for shallow water, deep water, shallow anchor and deep anchor A customer definable keel Offset can be set and displayed at any time Raymarine, the world leader in marine electronics, develops and manufactures the most comprehensive range of electronic equipment