Marathon is the far edge of our coverage map — and we still show up. If your boat lives on the Middle Keys side of the Seven Mile Bridge, you don't have to trailer it to Key West or wait on a shop that's booked three weeks out. We load the truck, make the drive, and work at your slip.
Why Marathon boaters call 3 Marine
Marathon runs a mixed fleet — offshore center consoles staging for the reef and the Gulf Stream, backcountry skiffs working the flats, and cruisers parked for the season at marina docks. All of it needs the same thing when something's wrong: a technician who diagnoses the actual problem instead of guessing.
Our lead technician is a Mercury Marine Certified Technician and an ABYC Certified Master Technician — the two credentials that matter most for outboard diagnostics and marine electrical work. We carry the diagnostic equipment and most common parts in the truck, so most Marathon calls close out in a single visit.
What we handle in Marathon
- Mercury diagnostics & repair — computer diagnostics, scheduled maintenance, lower unit and fuel system work. See Mercury Diagnostics & Repair for the full scope.
- Engine repair & overhaul — compression testing, head gaskets, cooling system rebuilds, powerhead work on outboards, inboards, and marine diesel. Details on Engine Repair & Overhaul.
- Marine electrical — batteries, charging systems, wiring, corrosion repair, electronics installation. Full list on Marine Electrical Services.
No haul-out required
Hauling a boat in the Keys costs money and time you don't get back. We work at your dock, lift, or mooring — wherever the boat already is. You keep your slip, you keep your schedule, and the boat stays in the water while we fix it.
Book Marathon service
Same-week appointments are standard; call ahead so we can route the truck up the Keys efficiently. Call or text (305) 832-1206, email info@3marinekw.com, or book online.
Keep your boat in the water. We'll come to you.