Profile: NAG Marine sells, services, designs, and installs advanced products for shipboard fluid systems. Our products range from tank level indicators, oily water separators, oil content monitors, ballast water treatment systems, shipboard water and sewage treatment systems, to ABS approved marine computers & fluid content monitoring instruments. We offer the entire line of Ohmart/VEGA measurement technologies, including radar, guided microwave, ultrasonic, capacitive, and hydrostatic pressure instrumentation lines.