Anchoring — types, scope, holding ground

USCG Boatswain Manual Ch. 2 §2.2

USCG Boatswain Manual Ch. 2 §2.2 — Mooring and Anchoring Anchor scope — the ratio of rode length to water depth plus bow height — should be 7:1 in good holding ground and calm conditions, 10:1 in storm conditions. Less scope reduces holding power; the rode must rest along the bottom for the anchor to set.

USCG Boatswain Manual Ch. 2 §2.3

USCG Boatswain Manual Ch. 2 §2.3 — Mooring and Anchoring Common anchor types: Danforth (lightweight, high holding power in sand and mud, poor in rocks); plough (CQR, Delta — good general-purpose, harder to stow); Bruce (claw — good in weeds); mushroom (permanent moorings); fluke (small craft).

33 CFR §164.19

§ 164.19 § 164.19 Requirements for vessels at anchor. The master or person in charge of each vessel that is anchored shall ensure that: (a) A proper anchor watch is maintained; (b) Procedures are followed to detect a dragging anchor; and (c) Whenever weather, tide, or current conditions are likely to cause the vessel's anchor to drag, action is taken to ensure the safety of the vessel, structures, and other vessels, such as being ready to veer chain, let go a second anchor, or get underway using the vessel's own propulsion or tug assistance. [CGD 74-77, 42 FR 5956, Jan. 31, 1977]

33 CFR §83.30

§ 83.30 § 83.30 Vessels anchored, aground and moored barges (Rule 30). (a) A vessel at anchor shall exhibit where it can best be seen: (i) In the fore part, an all-round white light or one ball; (ii) At or near the stern and at a lower level than the light prescribed in paragraph (i) of this Rule, an all-round white light. (b) A vessel of less than 50 meters in length may exhibit an all-round white light where it can best be seen instead of the lights prescribed in paragraph (a) of this Rule. (c) A vessel at anchor may, and a vessel of 100 meters or more in length shall, also use the available working or equivalent lights to illuminate her decks. (d) A vessel aground shall exhibit the lights prescribed in paragraph (a) or (b) of this Rule and in addition, if practicable, where they c…

46 CFR §28.235

§ 28.235 § 28.235 Anchors and radar reflectors. (a) Each vessel must be fitted with an anchor(s) and chain(s), cable, or rope appropriate for the vessel and the waters of the intended voyage. (b) Except for a vessel rigged with gear that provides a radar signature from a distance of 6 miles, each nonmetallic hull vessel must have a radar reflector.

Light List — Anchorage Area

Light List — Anchorage Area Anchorage Area Designated anchorages are outlined with a dashed magenta line on US charts and labelled with the anchorage type (general, prohibited, restricted, quarantine).