Why the Canadian Tribals probably carried PPI radar

Published equipment accounts do not normally give Canadian Tribal-class destroyers plan-position indicators at this date. Their conduct in the engagement suggests they had already received the necessary modifications. Keeping line abreast at night was difficult even with PPI and had caused collisions during exercises, making an unsupported attempt unlikely. The Canadian ships also operated together in a way that depended on reliable radar station-keeping. Spare equipment from ships lost or refitted may explain the unrecorded installation. The fit remains a reasoned inference from tactics and available equipment, without a confirmed installation date.