No correction, except those given in Section 2 of Admiralty Notices to Mariners, Weekly edition, should be made to any chart in ink. Correction to charts from information received from authorities other than the Hydrographic Office may be noted in pencil, but no charted danger should be expunged without the authority of the Hydrographic of the Navy. All correction given in Notice to Mariners should be inserted on the charts affected. When they have been completed the numbers of the notices should be entered clearly and neatly; pemanent notics in waterproof voilet ink. Temporary and preliminary notices in pencil. Temporary and preliminary notices should be rubbed out as soon as the notice is received canceling them