Page 4th Cover: of Maritime Reporter Magazine (June 15, 1971)

Aries Marine Seeks

Subsidy To Build And

Operate Two OBOs

Application has been made to the

Maritime Administration by Aries

Marine Shipping Co., Lake Success,

N.Y., a subsidiary of Avon Shipping

Co., for construction and operating subsidies to build and operate two San

Clemente class ore/bulk/oil carriers.

The approximate cost for these two vessels is $56.8 million and estimated rate of building subsidy is 44.3 per- cent.

Radiomarine Introduces

Versatile Anti-Collision

Ship Warning System

Radiomarine Corporation, Red

Bank, N.J., has-announced it has teamed up its advanced radar with a computer-data plotter to produce a highly effective anti-collision warning system for commercial vessels.

C. Webber Parrish, Radiomarine vice president and general mana- ger, said the new system, known as the Radiomarine Digiplot, is the first of its kind offered as a complete unit to the U.S. subsi- dized fleet by a single supplier.

The single most important fea- ture of the Digiplot system is its ability—without human command —to automatically acquire and plot the 40 most threatening targets.

In most other systems, the opera- tor himself must first decide which are the most threatening targets, and then manually "punch" those targets into the computer before the computer will automatically begin plotting them.

Mr. Parrish said the Radio- marine Digiplot system was de- vised by interfacing Radiomarine's own radar with Iotron Corpora- tion's patented Digiplot, a marine radar data plotter. He disclosed that Radiomarine has entered into an agreement with Iotron which gives Radiomarine exclusive rights to supply the Digiplot to American subsidized vessels.

Physical installation of the com- plete anti-collision system aboard a ship is relatively simple, Mr.

Parrish stated. The only extra space requirement is for the Digi- plot unit which stands alongside the radar indicator console and is approximately the same size. Elec- trically connected with the radar and gyrocompass, the Digiplot analyzes all radar echoes and auto- matically acquires, tracks and plots the 40 most threatening targets.

An audio and/or visual alarm is automatically triggered on the ba- sis of closest point of approach (CPA) distance and Time-to-CPA, according to criteria set up by the operator.

Once the operator has set the controls, the system maintains a continuous evaluation of all tar- gets. Those targets within the range selected are displayed on a 16-inch cathode ray tube. Land is shown as a series of dots two degrees apart, outlining the nearest shore line. Fixed targets are rep- resented with a circle and moving targets are shown as a circle with a line or vector indicating their course and position at a selected future time. The length of the vector indicates the target's posi- tion after a time pre-set by the operator.

The operator can make quick and accurate trial maneuver pre- dictions by inserting proposed course and/or speed changes and observing the speeded up results on the display. Own ship's dynam- ic characteristics are included, and the operator is thereby aided in selecting the optimum safe maneu- ver prior to giving commands.

Mr. Parrish meanwhile forecast that anti-collision warning systems will become increasingly more es- sential as the world's waters be- come more congested with super- size vessels in excess of 100,000 tons, and as more ships are built to operate at higher speeds, leav- ing less margin for human error.

The anti-collision system is ot solid state construction, assuring long trouble-free life. Present Ra- diomarine service facilities will install the systems, provide oper- ating instructions and handle maintenance requirements.

Radiomarine has long been the nation's leading supplier of navi- gation and communications equip- ment to the American merchant marine and other commercial ships.

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June 15, 1971 37