Essential nautical paper publications produced by the United Kingdom Hydrographic Office (UKHO) have been made available in digital form. Admiralty Digital Publications (ADP) contain identical information to corresponding paper publications and are approved as meeting SOLAS carriage provisions. Digital publications in the ADP portfolio include Total Tides, List of Lights, and Digital Radio Signals. These electronic publications are produced with the goal of helping navigators be efficient and free space up on the bridge of a vessel where space is a premium.