BoatMend

Repair & maintenance guides

Plain-English, step by step, written for owners. Pick your engine to see the guides that apply to it.

370 of 509 guides · page 13 of 16

ElectricalModerate

Power Trim Only Goes Up or Only Down: Relays, Switches and Wiring

When your outboard or sterndrive trims one way but not the other, the cause is usually electrical: a relay, a switch, a corroded plug or a wire. Learn how the up and down circuits work, how to swap-test the relays, how to tell the helm switch from the cowl switch, and how to tell an electrical fault from a hydraulic one.

1 h Outboard, Sterndrive (I/O) Shop: $150-600
TroubleshootingModerate

Prop Ventilation vs. Cavitation - Why Your Engine Revs Up and the Boat Loses Grip

Sudden RPM spikes, blowouts in turns, or a prop that slips when you accelerate are usually ventilation, not cavitation. Learn to tell them apart, then work through the fixes in order: trim, load, prop damage, the hull ahead of the prop, engine height, and finally a different prop.

1 h Outboard, Sterndrive (I/O)
Routine serviceEasy

Propeller Care: Inspect, Remove, Replace and Choose the Right Pitch

Check your prop for damage, pull it to clear fishing line and grease the shaft, reinstall it correctly, and learn how pitch affects your engine's wide-open-throttle RPM. The right prop in good shape protects your engine and often makes the boat run better and use less fuel.

45 min Outboard, Sterndrive (I/O) Shop: $50-150
Hull & systemsModerate

Protecting a Docked Boat: Mooring Whips, Bumpers, Fender Boards and Chafe Gear

Set up your dock or slip so wakes, wind and tides don't grind your hull against it, using mooring whips, dock bumpers, fender boards, spring lines and chafe gear, and know what these can and can't do in a storm.

4 h All engines Shop: $250-1500
Rules & seamanshipEasy

Reading Marine Weather Forecasts: Advisories, Wind, Waves and Go/No-Go

Learn where to get the official NOAA marine forecast for your waters, what small craft advisories and warnings really mean, how to read wind and wave numbers, and how to make a simple go/no-go call before you leave the dock.

30 min All engines
Rules & seamanshipEasyDraft

Reading NOAA Tide and Current Predictions for Trip Planning (MLLW, Slack Water and Bridge Clearance)

Tide is the water going up and down; current is the water moving sideways, and their timing doesn't always line up. Learn to find the right NOAA station, read high and low tides against chart datum (MLLW), find slack water and peak current, check bridge clearance against mean high water, and plan launches, anchoring and inlet crossings around them.

20 min All engines
SafetyEasyDraft

Reading Your Boat's Capacity Label (Old and New 2026 Format) and What It Means for a Repower

Learn to read every line of your boat's capacity plate, including the new ABYC S-7 label the Coast Guard accepted in July 2026 with its maximum outboard motor running weight, and use it to check a load or a repower before you spend money. Practical guidance, not legal advice.

30 min Outboard, Sterndrive (I/O), Gas inboard
ElectricalModerate

Remote Boat Monitoring: Bilge, Battery, Shore Power and GPS Alerts on Your Phone

Choose, install and set up a system that texts you when your unattended boat is taking on water, losing battery or shore power, or moving without you. Covers cellular versus satellite, what each sensor really tells you, wiring it so it stays on, sensible alert settings and what happens to your location data.

3 h All engines Shop: $250-900
TroubleshootingModerate

Remote Control Box Troubleshooting: Stiff Lever, Won't Crank, Trim Switch

The throttle and shift control at the helm (side-mount or binnacle) takes a beating. Learn how to find out why the lever is stiff, why the engine will not crank even with a good battery, why the trim button on the handle quit, and when the whole control box should be replaced along with its cables.

1 h 30 min Outboard, Sterndrive (I/O), Gas inboard Shop: $150-1200
Buying & ownershipEasy

Renaming a Boat: Paperwork, Removing the Old Name and the Optional Ceremony

Change your boat's name the right way: what a state-registered boat needs versus a Coast Guard documented boat (name change and hailing port go through the NVDC before you letter the hull), getting every trace of the old name off, lettering rules for documented boats, who else to tell (insurer, marina, MMSI, EPIRB, AIS), and the traditional renaming ceremony if you want the fun.

4 h All engines Shop: $150-600
Buying & ownershipModerateDraft

Renting Out Your Boat on Peer-to-Peer Apps: Insurance, Bareboat vs. Captained, State Rental Laws, Taxes and Wear

Thinking of listing your boat on a peer-to-peer rental platform to offset ownership costs? Learn why your personal policy probably won't cover it, what platform insurance does and doesn't do, the legal difference between a bareboat rental and a captained trip, state livery laws like Florida's, how rental income is taxed, and the real cost of extra hours and wear. Practical guidance, not legal, tax or insurance advice.

1 h 30 min All engines
TrailerAdvanced

Replacing a Boat Trailer Axle: When You Need One and How to Order the Right Size

A bent, rusted-through or undersized axle can't be fixed with new bearings. Learn the signs, the difference between straight, drop and torsion axles, the measurements a supplier needs (hub face, spring centers), what to specify for saltwater, and why this is usually a trailer-shop job.

5 h All engines Shop: $400-1500
Hull & systemsAdvanced

Replacing a Built-In Boat Fuel Tank: What's Involved and Why It's Usually a Pro Job

A leaking built-in gas tank is a fire and explosion risk that has to be fixed, not patched. Learn the signs a tank needs replacing, why foamed-in aluminum tanks corrode, what a compliant replacement tank and label look like, how access, grounding, hoses, vents and foam should be handled, and how to plan and check the work.

8 h Outboard, Sterndrive (I/O), Gas inboard, Jet boat, Marine diesel Shop: $1500-6000
Rules & seamanshipEasy

Right-of-Way on the Water: The Navigation Rules Every Recreational Boater Should Know

There are no lanes or stop signs on the water, so the Navigation Rules decide who keeps course and who gets out of the way. Learn stand-on and give-way, meeting head-on, crossing, overtaking, sail versus power, narrow channels, big ships, safe speed and keeping a proper lookout, with the rule numbers from the U.S. Inland Navigation Rules (33 CFR Part 83).

30 min All engines
TrailerModerate

Roadside Trailer Repairs: Carrying a Spare Hub and Changing a Hub or Tire Safely

Why a pre-greased spare hub and a real spare tire belong in every boat-trailer kit, how to pick the right ones, and how to change a failed hub or a flat on the shoulder without getting hurt: getting off the road, warning triangles, chocks, frame jack points, a lug wrench that fits, and the checks to make afterward.

1 h All engines Shop: $150-400
Routine serviceModerate

Salt and Scale in Raw-Water Cooling: Flushing Habits, Descaling and When It's a Shop Job

Learn how salt and scale slowly narrow your engine's cooling passages, how to spot the warning signs (a temperature that creeps up over seasons, a weak telltale, thermostats sticking), the flushing habits that prevent it, which descaling products and methods engine makers accept, what never to pour through an engine, and when to hand the job to a shop.

1 h Outboard, Sterndrive (I/O), Gas inboard, Marine diesel Shop: $150-900
Buying & ownershipModerate

Salvage and Branded Title Boats: What They Mean, the Risks, and How to Check Before You Buy

Understand boats that an insurer declared a total loss: what salvage, rebuilt and hull-damaged title brands mean, why flood and storm boats hide expensive problems, how branded titles affect insurance, financing and resale, how to dig into a boat's history, and what a survey should check. Title branding rules differ a lot by state, and some states don't brand boat titles at all.

3 h All engines
ElectricalModerate

Satellite Internet on Your Boat: Starlink Plans, Mounting, Power and Wiring

An owner's guide to putting Starlink aboard: which plans allow coastal, offshore and in-motion use (as of October 2026), how much battery it eats, 12-volt versus inverter power, where to mount the dish, and how to route and seal the cable without leaks.

4 h All engines Shop: $300-1500
SafetyEasy

Satellite Messenger vs PLB vs EPIRB: Which Emergency Device Should You Carry?

A PLB or EPIRB calls government search and rescue through the 406 MHz Cospas-Sarsat satellites with no subscription; a satellite messenger like an inReach or SPOT sends an SOS through a private network and adds texting and tracking for a monthly or yearly fee. Learn how each one alerts rescuers, what registration, subscriptions and batteries they need, what to carry for lakes, coastal and offshore boating, and how to test without causing a false alarm.

30 min All engines
SafetyEasyDraft

Seasickness: How to Prevent It and Care for Seasick Crew and Guests

Almost anyone can get seasick in the right conditions, but a few habits make a big difference. Learn why it happens, where to sit, what to eat and drink, how over-the-counter remedies fit in (and why the person running the boat must be careful with drowsy ones), how to look after someone who's sick, and when it might be something more serious. General information only, not medical advice.

10 min All engines
Buying & ownershipEasyDraft

Selling Your Boat: Broker, Private Sale, Consignment or Dealer Trade-In

Compare the four ways to sell a used boat (yacht broker, selling it yourself, dealer consignment and trade-in) on cost, effort, speed and risk, then handle the listing agreement, buyer scams, sea trial and survey etiquette, deposit and closing the right way. Practical help, not legal or financial advice.

2 h All engines
SafetyEasy

Set Up Your VHF Radio: MMSI, DSC, GPS Hookup and Radio Checks

Get a free or low-cost MMSI number, program it into your DSC radio, connect your GPS so a distress alert sends your exact position, check the antenna, and learn the Channel 16 rules and the right way to do a radio check.

1 h All engines Shop: $150-500
Buying & ownershipEasy

Sharing a Boat: Co-Ownership Agreements, Partnerships and Boat Club Alternatives

How to share a boat without losing a friend: choosing a partner, what a written agreement should cover (shares, costs, scheduling, maintenance standards, insurance, title, decisions and the exit), how to handle the inevitable disagreements, and when a boat club, rental or peer-to-peer option makes more sense. Practical guidance, not legal or tax advice.

2 h All engines
Buying & ownershipModerate

Shipping a Boat with a Professional Transporter: Quotes, Vetting, Prep and Claims

Most boat shipments go fine, but when they don't, the owner who checked the carrier's authority and insurance, prepped the boat properly and documented everything at pickup and delivery is the one who gets paid. Here's how to hire a transporter, prepare the boat and handle damage.

4 h All engines

Safety: BoatMend is for information only and does not replace a certified marine technician. You are responsible for your safety and your boat. Read the full disclaimer.