This paper described how 53 ships of the United States Lines had been fitted with 10 cm. radar and how instructions for maintenance and operation were given by the Company and the manufacturers of the equipment. Instruction in its use is given by a representative of the manufacturer, and subsequently minor adjustments and fuse replacements are made on board, all other maintenance being done under service contract in port.

General instructions sent by the Marine Superintendent to the Master of each vessel fitted stressed the following points:

1. i. For the present the equipment is to be regarded solely as a collisionwarning device.

2. ii. The installation in no way relieves the Master from conforming to the Rule of the Road or any Pilot Rules.

3. iii. A complete radar log in which maintenance and operational work are recorded should be kept.

4. iv. Deck officers should acquaint themselves with the use of the equipment and should be encouraged to read the manufacturer's descriptive and operational booklet.