Marine Surveying & Vessel Documentation

The four primary types of marine surveys are: (1) Pre-purchase survey — the most comprehensive inspection, conducted before buying a vessel; the surveyor evaluates hull integrity, systems, and equipment and provides a market value opinion. (2) Insurance survey — required by underwriters to establish insurability and agreed value; may be less detailed than a pre-purchase survey. (3) Damage survey — conducted after a casualty (collision, grounding, fire, flooding) to document the scope of damage and estimate repair costs. (4) Appraisal survey — establishes the fair market value of a vessel without a full systems inspection; used for estate purposes, financing, or legal disputes. Some surveyors also perform condition surveys (periodic inspections for existing owners) and new construction surveys (inspections during the build process).

SAMS (Society of Accredited Marine Surveyors) and NAMS (National Association of Marine Surveyors) are the two principal professional organizations for marine surveyors in the United States. SAMS awards the AMS (Accredited Marine Surveyor) designation; NAMS awards the CMC (Certified Marine Consultant) designation. To earn these credentials, surveyors must pass written examinations, document substantial sea and survey experience, submit work samples for peer review, and complete continuing education requirements. Lenders and insurance underwriters typically require surveys performed by SAMS or NAMS credentialed surveyors. On the USCG exam, these organizations may appear in questions about who is qualified to perform surveys for federally required inspections or documented vessel transactions.

Osmotic blistering (also called boat pox) occurs when water molecules migrate through the gel coat and outer fiberglass laminate via osmosis and react with water-soluble compounds in the resin to form an acidic fluid. This fluid creates pressure that separates layers of fiberglass and forms blisters — typically dome-shaped bumps ranging from pea-sized to several inches in diameter — on the wetted surface of the hull. Blisters compromise the structural integrity of the laminate over time and, if untreated, lead to delamination. A marine surveyor tests for blistering by tapping the hull (a hollow sound indicates separation), probing blisters with a sharp tool, and using a moisture meter to measure moisture content in the laminate. Readings above 15–20 percent on a calibrated meter indicate elevated moisture. Repairs require barrier coating or, in severe cases, complete peeling and re-lamination of the affected areas.

USCG vessel documentation (a federal Certificate of Documentation issued by the National Vessel Documentation Center) is available to vessels measuring 5 net tons or more that are wholly owned by U.S. citizens. Documentation replaces state registration for display purposes — a documented vessel does not display state-issued numbers on the hull, though some states still collect an annual fee. State registration applies to motorized vessels that are not federally documented; the owner receives a certificate and a set of alphanumeric identification numbers that must be displayed on the bow. Key differences: documented vessels carry an official number permanently marked on an interior structural member; they may engage in coastwise trade, fisheries, and Great Lakes trade if they also meet Jones Act requirements; they may carry a preferred ship mortgage recorded with the USCG. State-registered vessels cannot carry a preferred ship mortgage and are not eligible for USCG-documented vessel privileges.

An Abstract of Title is a chronological record of all recorded ownership transactions and encumbrances on a federally documented vessel, maintained by the USCG National Vessel Documentation Center. It shows every recorded bill of sale, preferred ship mortgage, satisfaction of mortgage, and other instruments affecting title. Before purchasing a documented vessel, the buyer or their attorney should obtain an Abstract of Title to verify that the seller has clear title and that no undisclosed liens or mortgages encumber the vessel. Unlike real estate title searches, a maritime abstract covers only recorded documents — unrecorded liens (such as maritime liens for necessaries or seaman wages) do not appear and can survive a sale. On the USCG exam, questions about documentation and title typically focus on what the Abstract reveals and its limitations.

The Hull Identification Number (HIN) is a 12-character alphanumeric identifier required on all recreational vessels manufactured or imported for sale in the United States after November 1, 1972, under 33 CFR Part 181. The HIN must be permanently affixed in two locations: (1) the primary HIN is on the starboard side of the transom at the upper right corner as close to the top as practicable; (2) a duplicate HIN is in an unexposed location — typically inside a compartment, under a fitting, or behind a fixed installation — to survive tampering or destruction of the primary HIN. The HIN encodes the manufacturer identification code (3 characters), hull serial number (5 characters), and date of manufacture (4 characters). Manufacturers must not remove, alter, or falsify a HIN; doing so is a federal offense. Surveyors verify both HIN locations and record them in the survey report.

Under 46 CFR 67.117 and related regulations, a documented vessel must display its vessel name and hailing port on the exterior of the hull. The name must appear on each side of the bow and on the stern. The hailing port must appear on the stern below the vessel name. Both the name and hailing port must be clearly legible and in letters no less than 4 inches in height. The hailing port must be a place in the United States and does not need to be the vessel owner's residence or the port where the vessel is kept — the owner may choose any U.S. city and state. The vessel name is chosen by the owner at the time of initial documentation and is subject to name availability; certain words (like those implying government affiliation) are prohibited. A vessel name change requires an endorsement amendment and re-documentation.

A preferred ship mortgage is a mortgage on a documented U.S. vessel that has been recorded with the USCG National Vessel Documentation Center, giving it special priority status under the Ship Mortgage Act (46 U.S.C. Chapter 313). To be preferred, the mortgage must: (1) cover a documented vessel, (2) be in proper form, (3) be filed and recorded with the NVDC. A preferred ship mortgage ranks in priority after maritime liens for seamen's wages, salvage, and certain tort claims, but ahead of general contract claims. A regular (non-preferred) ship mortgage on an undocumented or state-registered vessel has no federal maritime priority and must be enforced through state courts like a UCC Article 9 security interest. The distinction matters on the exam because only documented vessels can carry preferred ship mortgages.

Maritime lien priority (from highest to lowest) is: (1) Court costs and U.S. Marshal fees for arresting and selling the vessel; (2) Seamen's wages — given the highest substantive priority under long-standing maritime law; (3) General average and salvage — rewards for voluntary rescue of a vessel in peril; (4) Tort claims arising from collision, personal injury, or property damage; (5) Preferred ship mortgages (recorded with the USCG NVDC); (6) Necessaries — supplies, repairs, fuel, and services furnished on credit. Maritime liens arise automatically by operation of law; they do not require a written agreement, recording, or notice to the owner. They travel with the vessel and survive changes in ownership, which is why a title search alone cannot protect a buyer from undisclosed liens.

A standard marine survey report typically includes: (1) Identification section — vessel name, official number or state registration, HIN, make, model, year, LOA, beam, draft, displacement, and engine(s); (2) Purpose and scope — the type of survey and what was and was not inspected; (3) Methodology — tools and instruments used (moisture meter, hammer test, visual inspection, sea trial); (4) Hull and structure findings — topsides, bottom, transom, deck hardware, through-hulls, and structural members; (5) Systems findings — electrical, plumbing, fuel, propulsion, bilge pumps, safety equipment, and navigation electronics; (6) Deficiencies and recommendations — items listed by priority (safety critical, immediate attention, deferred maintenance); (7) Valuation — the surveyor's opinion of fair market value and replacement value; (8) Surveyor certification — signature, credentials (SAMS/NAMS), and date. The report is the surveyor's professional opinion, not a warranty or guarantee.

Marine electrical inspection covers both AC and DC systems. DC system inspection includes: battery condition and capacity (load testing), cable sizing and ABYC color coding compliance, overcurrent protection (fuses and circuit breakers) within 7 inches of the battery positive terminal, bonding system continuity, bilge blower wiring, and navigation light circuits. AC system inspection covers: shore power inlet, main panel and breakers, reverse polarity indicators, GFCI protection in wet locations, grounding conductors, and galvanic isolation. The surveyor also checks for non-marine-grade automotive wiring (a common fire hazard), exposed connections in bilges, and corrosion on terminals. Fuel system wiring near ignition sources is a critical safety finding. ABYC (American Boat and Yacht Council) standards are the primary reference for compliance.

Delamination is the separation of layers within a fiberglass laminate — the bond between the gel coat, mat, woven roving, or core material (foam or balsa) fails, creating voids or soft spots. Delamination can result from osmotic blistering, impact damage, freeze-thaw cycles (especially in cored decks with water intrusion), manufacturing defects, or age. Detection methods include: hammer or coin tap testing (a dull, hollow sound indicates separation versus a solid ring in a sound laminate); moisture meter readings at multiple grid points across the hull and deck; and flex testing by applying hand pressure to suspect areas. Core samples may be taken by drilling small-diameter holes in non-critical locations to inspect visually. Delamination in structural areas (keel attachment zone, chainplates, engine beds, deck hardware mounts) is a safety-critical finding requiring immediate repair.

Fuel system inspection covers: fuel tank material and condition (aluminum, fiberglass, or polyethylene; corrosion, leaks, mounting security); fuel fills and vents (proper anti-siphon and anti-backfire protection); fuel lines (USCG Type A or B rated hose, no automotive hose in fuel applications); fuel valves and shutoffs (accessible and labeled); carburetors or injection systems; and the engine compartment ventilation system (blower capacity and ducting). The surveyor checks for fuel leaks (smell, visible staining), adequate bilge ventilation to prevent vapor accumulation, flame arrestors on gasoline engines, and compliance with NFPA 303 and ABYC H-24. A sea trial includes running the engine under load to observe performance, smoke color, oil pressure, temperature, and cooling water flow. Diesel engines are also checked for air intake restrictions and injector condition.

Safety equipment inspection covers: personal flotation devices (PFDs) — type, quantity, condition, and size appropriateness for persons aboard; visual distress signals (flares) — type approval and expiration dates; fire extinguishers — USCG type approval, charge indicator, mounting, and expiration (5-year inspection or 12-year replacement for certain types); sound-producing devices (horn and bell); navigation lights — function test and appropriate types for vessel size and operation; EPIRB or PLB if fitted — registration, battery expiration, and hydrostatic release if applicable; life rafts — last service date, capacity certification, and securing; throwable device (Type IV PFD); and first aid kit. Inspected (certificated) vessels must also have a fire detection system, bilge alarms, and meet COI safety equipment requirements. The surveyor notes any expired or non-compliant items as safety-critical deficiencies.

No — a marine survey report is a professional opinion based on a visual inspection at a specific point in time, not a certification of seaworthiness. Surveyors use qualifying language to this effect in their reports: the survey reflects conditions observed on the survey date; the surveyor makes no representation about hidden defects, latent conditions, or future performance. The legal concept of seaworthiness is a judicial determination, not a surveyor's certificate. An insurer or lender may accept a survey as evidence that a vessel meets certain standards for underwriting or financing purposes, but that acceptance is the insurer's or lender's judgment, not a seaworthiness certification. On the USCG exam, this distinction may appear in questions about what authority a marine surveyor holds and what a survey report represents.

Federal documentation is mandatory (not just optional) for vessels that are: (1) used in coastwise trade (transporting passengers or cargo between U.S. ports for commercial purposes) if they measure 5 net tons or more; (2) used in the fisheries within the U.S. Exclusive Economic Zone (EEZ) if they measure 5 net tons or more; or (3) used in the Great Lakes trade under specific treaty provisions. For recreational vessels 5 net tons or more owned by U.S. citizens, documentation is optional — they may choose either USCG documentation or state registration. Vessels under 5 net tons, non-motorized vessels (in most states), and vessels not wholly owned by U.S. citizens cannot be federally documented and must use state registration. A vessel engaged in coastwise trade without proper documentation (and Jones Act compliance) is subject to seizure and forfeiture.