# The Merchant Shipping (Submersible Craft Construction and Survey) Regulations 1981, Paragraph 7: Navigation and Position Indication


(7.1) Manned submersible craft shall be:—
(7.1.1) fitted with a compass;
(7.1.2) fitted with an adequate means of determining the distance of the craft from the seabed;
(7.1.3) provided with an adequate means of visual look-out ahead of the craft or be fitted with equipment to determine and avoid obstacles when submerged;
(7.1.4) fitted with such gauges or instruments to provide a continuous read-out of depth to the crew; a minimum of two such instruments shall be fitted; one of which shall be a dial gauge; they shall not share a common hull penetration;
(7.1.5) fitted with equipment to indicate heel and trim;
(7.1.6) fitted with a visual means of position indication for use when on the surface, including highly visible paint, and strobe light;
(7.1.7) fitted with a sonic location device to provide position indication in an emergency when submerged;
(7.1.8) be equipped with a timepiece which does not use the main power supply.

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Source: https://www.legislation.gov.uk/uksi/1981/1098/schedule/1/paragraph/7 (the official version)
Page: https://openlegislation.uk/merchant-shipping-submersible-craft-construction-and-survey-regulations-1981/schedule-1/paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.