Section 44 in The Port Rules for the Port of Bombay
44.
A steam or other vessel, when employed in towing a target, shall by day show from her mast-head a square red flag and from one of her yard-arms two red globes of spherical shapes abreast of each other, the shapes being each at least four feet in diameter. Such vessel, when similarly employed, shall by night show a red light in place of the flag at her mast-head and two red lights in place of globes or shapes at either yard-arm in addition to her usual mast-head and side lights. All vessels shall give such vessel a wide berth and avoid passing under her stern or between her and the target.
