What Is the Assistance Towing Endorsement?
The USCG Assistance Towing endorsement is an add-on credential that authorizes you to tow disabled recreational vessels for compensation. If you're running a commercial towing operation — think Sea Tow, BoatUS, or any independent marine assistance service — and you're getting paid to tow boats, you need this endorsement on your captain's license to operate legally.
Without it, towing for hire is an unauthorized commercial operation. The same way you need the OUPV to carry paying passengers, you need the Assistance Towing endorsement to tow for pay. This is a commonly overlooked credential, especially among captains who drift into towing work gradually — starting with helping a friend, then a referral, then charging for it — without realizing the legal line they've crossed.
Who Needs It
You need the Assistance Towing endorsement if you are:
- Working for a commercial marine towing service (Sea Tow, BoatUS, independent operators)
- Running your own marine assistance business that includes towing
- Offering towing services as part of a charter or commercial vessel operation
- Getting compensated in any form for towing disabled vessels
You do not need it to tow your own vessel, to tow a friend's boat as a favor with no compensation, or to assist another vessel in a genuine emergency under the Good Samaritan principles that apply to maritime rescue.
The critical word is compensation. As soon as money (or anything of value) changes hands for a tow, you're operating commercially and the endorsement is required.
What You Need Before Applying
An Existing Captain's License
The Assistance Towing endorsement is added to an existing OUPV or Master credential — it's not a standalone license. You must already hold or be applying simultaneously for a qualifying captain's license.
Towing-Specific Sea Service
This is where the Assistance Towing endorsement differs significantly from a standard OUPV. You need 60 days of towing experience in addition to any general sea service requirements. These 60 days must be on vessels actively engaged in towing operations — you need hands-on towing experience, not just time on the water generally.
For many applicants, this is the constraint. If you're new to towing work and want to get the endorsement, you'll need to log time doing actual towing — either working for an established towing company, assisting at a marina that does salvage and assistance work, or otherwise getting documented experience with vessels under tow.
The 60 towing days do not need to be all on the same vessel or with the same operator. They can be accumulated across multiple vessels and operators, documented separately, and combined in your application.
A Towing Safety Management System (TSMS) Course
Applicants for the Assistance Towing endorsement must complete an approved training course covering towing safety and operations. The American Boat and Yacht Council (ABYC) and several maritime training organizations offer TSMS-compliant courses. These are typically one-day classroom or online courses covering towing equipment, safe approach procedures, rigging, and emergency protocols.
Confirm that the course you select is USCG-approved for the Assistance Towing endorsement before enrolling. The NMC maintains a list of accepted courses.
The Endorsement Exam
The Assistance Towing endorsement requires passing a separate exam module at the Regional Examination Center (REC). The exam covers:
- Towing equipment and rigging: Tow lines, bridles, shackles, cleats, and bitts — their types, load ratings, and proper use
- Safe approach procedures: How to approach a disabled vessel in various sea states and wind conditions
- Towing configurations: Short tow, long tow, alongside towing, and when each is appropriate
- Speed and catenary: How towing speed affects the tow line's behavior and the strain on both vessels
- Communication: Coordinating with the disabled vessel, VHF radio procedures, and notifying the Coast Guard when required
- Casualty situations: Towing in restricted visibility, in rough seas, at night, and what to do when a tow parts
- Legal responsibilities: Salvage law basics, contracts, and when a "tow" becomes a "salvage" situation with different legal implications
The salvage vs. assistance towing distinction is worth understanding clearly. An assistance tow is help rendered under a pre-existing service contract (like a Sea Tow membership) or a simple assistance agreement. Salvage applies when a vessel is in peril and the salvor acts without a pre-existing contract — salvage creates a lien against the saved vessel and can entitle the salvor to a percentage of the vessel's value. Knowing this distinction matters both on the exam and in practice.
Towing Equipment: What the Exam Expects You to Know
The towing exam goes into more practical depth on equipment than most captain candidates expect. Key areas:
- Tow line materials: Nylon (stretches, good for shock absorption), polypropylene (floats, less stretch), and wire rope (commercial heavy towing). For recreational assistance towing, nylon is standard.
- Chafing gear: Required wherever the tow line passes over the gunwale or through a chock. Without it, a line can chafe through in a matter of hours.
- Tow bridle: Distributes load across two points on the towing vessel rather than concentrating it at a single cleat. Required for most offshore or heavy towing situations.
- Length of tow: Longer tow lines provide more elasticity and reduce shock loads, but create navigation challenges in tight quarters. Short-tow configurations (alongside or short bridle) are used in marinas and tight channels. The exam tests when to use each.
- Scope: In open water, pay out enough scope to keep the tow line's catenary (the natural sag) working as a shock absorber. A taut tow line transfers every surge directly between vessels and risks parting.
Adding the Endorsement to an Existing License
If you already hold an OUPV or Master credential and want to add the Assistance Towing endorsement, the process is:
- Accumulate and document 60 days of towing sea service.
- Complete an approved TSMS towing safety course.
- Submit an application to the NMC with your towing sea service records, course completion certificate, and applicable fees.
- Receive authorization to sit for the towing endorsement exam at your nearest REC.
- Pass the exam. Your credential will be reissued with the endorsement added.
You do not need to retake the full captain's license exam — only the towing endorsement module. If your existing credential is current and in good standing, the upgrade process is straightforward.
Commercial Towing vs. Assistance Towing
The Assistance Towing endorsement covers recreational vessel assistance — towing disabled pleasure boats. It is not the same credential as the Inland or Oceans Towing endorsements required for commercial vessel towing (pushing barges, towing cargo vessels, assisting ships in port).
If you're interested in commercial towing as a career — working on tugboats or towing vessels in a commercial capacity — that pathway involves different sea service requirements, different exam modules, and in many cases a higher-tonnage license. The Assistance Towing endorsement is specifically for recreational marine assistance operations.
Is It Worth Getting?
If there's any chance you'll tow for compensation, yes — get it. The endorsement is not difficult to obtain if you have or can get the 60 towing days, and the legal exposure from towing for pay without it is not worth the risk. USCG enforcement actions against unlicensed-for-hire operations are real.
For many captains running charter operations near popular anchorages or in areas with high recreational boat traffic, having the Assistance Towing endorsement opens an additional revenue stream that fits naturally alongside charter work. It's a practical add-on credential with clear commercial value.
Practice questions for towing and Rules of the Road — both of which appear on the endorsement exam — are available in The Chartroom's practice area. If you're preparing for the OUPV or 100-Ton alongside the towing endorsement, you can drill the overlapping material simultaneously.