A trip and tow survey evaluates whether a towing vessel, the vessel or barge being towed, and the entire towing arrangement are ready for a specific voyage. The survey looks well beyond the towline itself. A qualified surveyor reviews the tug’s condition, the tow’s condition, the connection arrangement, stability, crew capability, route, weather, and contingency preparation before the operation begins.
At A&L Marine Surveyors, this survey draws on Captain Arlen Leiner’s unlimited towboat license, held since 1967, combined with his USCG Master and marine engineering credentials. That background gives the survey a level of practical towing judgment that a checklist alone cannot provide.
You may also see this service called a trip in tow survey. Trip in tow is the older maritime term, and trip and tow developed later as an industry variation. Both phrases describe the same evaluation, and this article uses trip and tow survey as the primary term since it matches current industry usage and A&L’s own service naming.
Why Is a Trip and Tow Survey Performed?
Towing an unpowered vessel or barge introduces risks that don’t exist when a vessel moves under its own power. The tow has no independent means of steering or stopping, so the entire operation depends on the tug’s capability, the connection holding under load, and the crew making sound decisions if conditions change.
A trip and tow survey exists to confirm, before departure, that these elements are sound. Insurers, charterers, and regulatory bodies often require this confirmation before approving a voyage, and the survey gives all parties documented assurance that the tow is ready to proceed safely.
What Vessels May Need a Trip and Tow Survey?
Trip and tow surveys apply to a range of towing operations, including:
- Tugs towing barges, deck cargo, or floating equipment
- Commercial vessels under tow for repair, relocation, or delivery
- Offshore structures or floating assets moved between locations
- Vessels moving between shipyards, ports, or job sites
The specific scope of the survey depends on the vessels involved, the route, the cargo, and the purpose of the movement.
Tug and Towing Vessel Condition
The survey starts with the towing vessel itself. A surveyor evaluates the tug’s general condition, propulsion, maneuverability, and suitability for the specific tow it’s about to perform. A tug well suited to a short harbor tow may not carry adequate power or equipment for an offshore voyage in open water.
Engine horsepower and available towing capacity matter here, since they determine whether the tug can maintain control of the tow under expected conditions, including wind, current, and sea state. A&L’s commercial vessel inspection experience directly supports this part of the evaluation.
Condition of the Vessel or Barge Being Towed
A trip and tow survey doesn’t focus on the tug alone. The vessel or barge in tow needs its own evaluation, since its structural condition, draft, stability, and watertight integrity affect the entire operation just as much as the tug’s capability does.
A surveyor checks the towed vessel for structural soundness, confirms its draft is appropriate for the route, and verifies that any cargo or equipment aboard is properly secured. A structurally compromised barge or an improperly loaded tow creates risk regardless of how capable the tug is.
Stability, Draft and Trim
Stability deserves its own dedicated evaluation rather than a passing mention. A surveyor reviews the tow’s intact stability, draft, trim, and loaded condition to confirm the vessel sits properly in the water and responds predictably to towing forces and sea conditions.
Free surface effect, ballast condition, and displacement all factor into this assessment. A tow that appears stable at the dock can behave very differently once underway, particularly if loading or ballast conditions shift during the voyage. Confirming adequate intact stability for the expected voyage conditions is a standard part of preparing a vessel for tow.
Tow Lines, Towing Gear and Connection Arrangements
The connection between tug and tow is the physical link holding the entire operation together, and it receives close attention during the survey.
A surveyor examines the towline itself, including its length, condition, and suitability for the intended tow. Beyond the line, the survey covers the towing bridle, shackles, and other terminal gear that make up the connection. Shock line connections absorb sudden loads during the tow and need to be properly rigged and in sound condition.
The hookup arrangement matters as much as the individual components. Rather than simply confirming that towing gear exists, the surveyor considers how the tug and tow are actually connected and whether that specific arrangement suits the intended movement. This includes checking fairlead positioning, chafing protection at points where the line contacts the vessel, and the quick release arrangement that allows the crew to disconnect the tow quickly in an emergency. The condition of the towing winch also factors into this evaluation, since it controls how the line pays out and takes up tension throughout the voyage.
Towing Capacity and Bollard Pull
Towing capacity, often documented through bollard pull figures, describes how much pulling force a tug can generate. This matters because it determines whether the tug can maintain control of the tow against wind, current, and sea resistance.
Not every trip and tow survey requires a new bollard pull test. Documented towing capacity or existing bollard pull information may be relevant depending on the specific operation and the survey’s scope, and a surveyor determines what’s appropriate case by case rather than applying a blanket requirement.
Watertight Integrity and Bilge Systems
Watertight integrity is a major safety consideration that basic tow inspections sometimes overlook. A surveyor checks hatches, doors, valves, air pipes, and other openings on the towed vessel to confirm they close properly and won’t allow water ingress during the voyage.
This check matters most on unmanned tows, where nobody aboard can respond to developing flooding. Confirming watertight integrity and reviewing bilge system readiness before departure gives the crew and surveyor confidence that the tow can handle the conditions it’s likely to encounter.
Cargo Securing and Sea Fastening
When the towed vessel carries cargo or equipment, cargo securing becomes a separate and important part of the survey. A surveyor reviews how deck cargo is stowed and lashed to confirm it won’t shift during the tow.
Sea fastening is a related but distinct concept worth separating clearly. Towing gear connects the tug to the tow, while sea fastening secures cargo or equipment carried aboard the tow itself. Both need independent evaluation, since a secure tow connection doesn’t guarantee the cargo aboard is equally secure.
Trip and Tow Survey
Route and Voyage Planning
Route planning covers the departure point, destination, and everything in between. A surveyor reviews the intended route for navigational hazards, water depth, bridge clearances, and available refuge ports along the way.
Advance route planning should also account for currents and tidal streams that could affect the tow’s speed, fuel consumption, and course. Identifying safe havens in advance gives the crew somewhere to shelter if conditions deteriorate mid-voyage.
Weather and Sea Conditions
Weather planning goes hand in hand with route planning. A surveyor considers the forecast conditions for the intended voyage window, including wind, wave height, and any developing weather systems along the route.
A favorable weather window reduces risk substantially on a tow, since towed vessels generally handle rough conditions worse than self-propelled vessels. Reviewing forecasts and identifying an appropriate departure window is a standard part of preparing for the voyage.
Crew Capability and Working Hours
Crew capability plays a direct role in how safely a tow operation proceeds. A surveyor reviews the tug’s crew, checking their experience, licenses, and working hours to confirm the crew can safely manage the tow throughout the voyage.
Watchkeeping arrangements matter here too, since fatigue affects a crew’s ability to respond to changing conditions or an emergency. Credentials such as a Merchant Mariner Credential confirm that crew members hold the qualifications appropriate for the operation. A&L’s own founder brings direct towing credentials to this part of the evaluation, having held an unlimited towboat license since 1967 alongside USCG Master and marine engineering qualifications.
Navigation and Safety Equipment
The survey also covers the tug’s navigation and safety equipment, including radar, communications equipment, charts, nautical publications, navigation lights, and sound signals. Functioning equipment in these categories supports safe navigation and allows the crew to communicate and respond appropriately throughout the voyage.
Lifesaving and fire suppression equipment also fall under this review where applicable. Not every requirement applies to every tow. Applicability depends on the vessel, route, service, and jurisdiction involved, so a surveyor evaluates each operation against the standards that actually apply to it.
Contingency and Emergency Planning
Strong trip and tow survey content addresses more than how a tow begins. It also addresses what happens if the operation doesn’t go according to plan.
A surveyor reviews the crew’s contingency planning for scenarios such as deteriorating weather, a towline failure, or loss of propulsion on the tug. Identifying refuge ports and safe havens in advance, discussed earlier in route planning, forms part of this contingency preparation. A documented plan for how the crew would respond to an emergency situation gives the entire operation a stronger safety margin than simply hoping conditions stay favorable.
Documents the Surveyor May Review
Depending on the scope of the survey, a surveyor may review supporting documentation such as:
- Vessel certificates and inspection records
- Towing plans and voyage plans
- Stability information for the towed vessel
- Cargo and lashing plans, where applicable
- Crew credentials and licenses
- Towing gear certificates
Reviewing this documentation alongside the physical inspection gives the survey a more complete picture of the tow’s readiness.
What Happens if the Survey Finds a Problem?
A trip and tow survey doesn’t end with a simple pass or fail. If the surveyor identifies a significant issue, whether it involves the towline, connection arrangement, watertight integrity, stability, cargo securing, towing vessel suitability, or the weather plan, that issue typically needs to be addressed before the voyage proceeds.
Depending on the finding, this might mean replacing or re-rigging towing gear, adjusting the loading condition to correct a stability concern, resecuring cargo, or waiting for a more favorable weather window. The surveyor’s report documents these findings clearly so the vessel owner, operator, or insurer understands exactly what needs attention before departure.
What Is Included in the Trip and Tow Survey Report?
The survey report documents the surveyor’s findings across each area reviewed, supported by photographs of the tug, the tow, the connection arrangement, and any deficiencies identified. It typically includes an assessment of vessel and equipment condition, stability findings, crew capability observations, and route and weather considerations, along with clear recommendations where corrective action is needed.
This documentation gives owners, operators, and insurers a factual record that the tow was evaluated appropriately before the voyage began.
Trip and Tow Surveys in Florida
A&L Marine Surveyors performs trip and tow surveys throughout Florida, drawing on Captain Leiner’s decades of towing and commercial vessel experience along the state’s waterways, ports, and coastal routes. Whether the operation involves a short harbor tow or an offshore voyage, A&L applies the same thorough evaluation of the tug, the tow, and the complete towing arrangement.
Frequently Asked Questions
What is a trip and tow survey?
A trip and tow survey evaluates whether a towing vessel, the vessel being towed, and the towing arrangement are ready for a specific voyage, covering everything from vessel condition and stability to crew capability and weather planning.
What does a trip and tow survey include?
It includes evaluation of the tug and tow’s condition, stability and draft, towing gear and connections, crew capability, route and weather planning, watertight integrity, cargo securing where applicable, and contingency planning.
When is a trip and tow survey needed?
It’s typically needed before towing a barge, unpowered vessel, or floating structure, especially when insurers, charterers, or regulatory requirements call for documented confirmation that the tow is ready to proceed.
What towing equipment does a marine surveyor inspect?
A surveyor inspects the towline, towing bridle, shackles and terminal gear, shock line connections, fairlead positioning, chafing protection, quick release arrangements, and the towing winch.
Does a tow survey check vessel stability?
Yes. Stability, draft, and trim receive dedicated evaluation, since a tow’s loaded condition and stability directly affect how it responds to towing forces and sea conditions.
Does a trip and tow survey include weather and route planning?
Yes. A surveyor typically reviews the intended route for navigational hazards and refuge ports, and evaluates weather forecasts to help identify a favorable departure window.
What happens if a problem is found before the tow begins?
Depending on the finding, the crew may need to address the issue before departure, such as re-rigging towing gear, correcting a stability concern, resecuring cargo, or waiting for better weather.
What is the difference between trip and tow and trip in tow?
Both terms describe the same type of survey. Trip in tow is the older maritime expression, while trip and tow developed later as a common industry variation. A&L uses trip and tow survey as its primary service name.
If you’re preparing to tow a vessel, barge, or floating structure, schedule a trip and tow survey with A&L Marine Surveyors before your voyage begins.
