Infinite Blue is the deep sea fishing name in Marathon with the deepest, cleanest record in the port and the most comfortable boats to fish from. The flagship is a 50 foot SeaRay flybridge with a cabin, air conditioning, and two heads, the rare cabin sportfisher in a town that runs mostly open center consoles, and the FishingBooker record behind the fleet is close to spotless: a 5.0 rating across more than 300 reviews on the big boat and 4.9 across well over a hundred on the next one down. The owner, Captain Robert Williams, is a Coast Guard certified military veteran. The one honest caveat is that a three boat fleet spreads the captain across hulls, so the owner does not run every trip.
The verdict and where it ranks
At 8.0 Infinite Blue is the top pick in the Marathon ranking, and it earns the spot on the boat and the record rather than on tournament pedigree. Where Main Attraction and Big Game are sailfish and swordfish specialists, Infinite Blue is the comfort and consistency pick: the most boat for the money, an all inclusive price with no fuel surcharge, and the steadiest reviews in the port. Book it for a family or a group that wants room and a cabin on a longer day offshore, or a nimbler center console for less. The thing to confirm is which captain you draw, since the owner is one of several across the fleet. For a single owner operator you book by name, the two specialists below it are the call.
The boat
The fleet is the story. The 50 foot SeaRay flybridge is the most comfortable charter boat in Marathon, with a cabin, a couch, air conditioning, a kitchen, and two full heads, and a large fishing platform for up to 6 anglers, which is a real edge on a long run to the offshore grounds or the Hump in a chop. Below it sit a 30 foot WellCraft and a 31 foot Angler, both center consoles rigged for 6, faster and cheaper but open to the weather the way every center console is. The boats are well kept and reviewers single out their condition and comfort. Most operations in the port cannot offer a cabin and air conditioning at all, so this is where Infinite Blue stands apart.
The fishing and what you target
Infinite Blue fishes the Middle Keys spread: trolling offshore for mahi mahi from late spring into summer, sailfish on the winter push, and blackfin tuna, wahoo, and king mackerel as they run, then drifting the wrecks and bottom fishing the reefs for yellowtail and mangrove snapper, grouper, and amberjack. The boats reach the offshore grounds and the deeper structure, and the big SeaRay has the range and comfort for the longer runs. As with the rest of the Keys, the grouper season closes on the Atlantic side from January into April and hogfish opens May through October, so the bottom box shifts with the calendar; the captain plans around what is open and biting.
Trips and prices
Infinite Blue posts its rates on its FishingBooker listings, sold by the whole boat for up to 6 anglers, starting around $925 for the 30 foot WellCraft and about $1,200 for the larger 50 foot SeaRay, with the full day and the big boat running higher. The inclusions are strong: all licenses, rods, reels, lures, and bait are covered, and the operator states there is no added fuel charge, which is a real plus in a port where a long offshore run can carry one. A captain and mate gratuity is on top. Our cost guide puts those numbers in context, and the party boat versus private charter guide weighs the whole boat here against a seat on the Marathon Lady.
The crew
The case for the crew is the record: a 5.0 rating across more than 300 reviews on the SeaRay and 4.9 across more than 150 on the WellCraft is the deepest, cleanest trail in the port, with reviewers consistently describing attentive, friendly captains who go out of their way for the group. Owner Captain Robert Williams sets the tone, and his Coast Guard service and veteran background come up in how reviewers describe the safety and care on the boat. The honest limit is the one a multi boat fleet carries: with several captains running the three hulls, the owner is not on every trip, so confirm who is taking you out, since on this coast the captain makes the day.
Booking and what to know
Book through the FishingBooker listings or direct, and confirm the meeting marina and which boat and captain you are getting. Bring food, drinks, sun protection, and a cooler for your fillets; licenses, gear, and bait are covered, and there is no fuel surcharge. The big SeaRay is the pick for a family or a group that wants comfort and a head, the center consoles for a leaner, cheaper trip. Book ahead in the winter sailfish stretch and the summer mahi season, when the good weather windows fill.
How we scored it
Infinite Blue scores 8.0: the most comfortable boats in Marathon and the deepest, cleanest review record in the port, on an all inclusive price with no fuel charge, held back only because a three boat fleet spreads the captain across hulls. Boat and equipment and track record are its strongest factors. See how we scored this boat for the full rubric and weighting, and compare it against the rest of our Marathon rankings, including Main Attraction and the Marathon Lady.