All Boating Charters
- Seaview Nautical Events – Lisbon Ocean Safari
- Seawalker Excursions
- Seawater Society Charters Malta
- Seazen sailing
- Seañorita 43ft Sea Ray Sundancer
- Sebi Boat Tours – Giuliana
- Second Chance Fishing Charters LLC
- Second Generation Bay Boat Charters
- Second Generation Fishing Charters Key West
- Second Sport Charters
- Secret Bays LLC
- Secret Beach Boat Shuttle
- Secret Cays Bahamas
- Secret Coast Fishing Charters
- Seek N Fishing Charter
- Selenim Yachting
- Semi-Sub Seychelles Ltd
- Sense Of Nature Safaris – Ali Boat Maun GT 80
- Serena Boat Tours Lisbon – Sailboat Eliefe
- Serene Yachts – Princess Marya
- Serene Yachts – Sleek
- Serenity Boat Charters-Bluelagoon,Comino&Gozo
- Serenity Charters TCI
- Serenity Sea Tours
- Serenity Speedboat Hurghada
- Serenity Sunset Cruise
- Serenity Sunset Cruise Destin FL
- Sestri Sea Service Srls
- Sestri Sea Service – Callegari 690
- Sestri Sea Service – Eolo 6.9
- Sestri Sea Service – Mirò Bat 23
- Set 'Em Up Ecological Adventures
- Set Sail Tours
- Setsail World – Experience No Noise Sailing
- Seven Day’s Snorkeling
- Seven Star Dinner Cruise
- Sg Group Boat Charter Naples – Bombastica 28
- Sg Group Boat Charter Naples – Darlin 25
- Sg Group Boat Charter Naples – Squalo Junior
- Sg group srls - Italyure 50
- Shaded dolphin snorkel & SUP top shelf drinks
- Shaggy's Diving
- Shala River Tour from Komani Lake
- Shallow Water Experience LLC
- Shangri-la Yacht Rentals Vancouver – Dave
- Shangri-la Yacht Rentals Vancouver – Kane
- Shangri-la Yacht Rentals Vancouver – Maxum
- Shared Boat to Orange Bay Island & Snorkeling
- Sharkcana Yachts – Private Yacht Excursions
- Sharks Teeth, Sand Dollars, Dolphins, & MORE!
- Shark’s Tours
- Sharm Activities
- Shasa Catamaran Cruises
- Shay's Outdoor's
- Shearwater Charters
- Shell Island Dolphin Tour
- Shell island tour
- Shelton's Charter Fishing
- Sherden Sea Charter
- Shockwave Charters
- Shoki Charters
- Shooter Dog Cruises
- Shore Chaos Charters
- Shore Service
- Shore Thing Charters OCNJ
- Shore Thing Charters – Savannah
- Shore-Thing Charters
- Short Skirts Sportfishing
- Short Skirts Sportfishing
- Shotime Charters
- SiP Travel – Blue Cave Adventure
- SiP Travel – Boka Bay Tour
- Sicily Fishing Charter
- Sicily Yachting Club
- Sick Day Boat Tours – San Diego
- Side Boat Tour – İlyas Reis 1
- Side Quest Charters
- Sidekick Charters
- Sierra Surf House
- Siesta Boat Charters
- Sightseeing,Booze,Sunset and Lake Boca Cruise
- Signature Island Charters
- Silvana Yacht
- Silver Dollar Charters
- Silver Thatch Watersports – Diver
- Silver Thatch Watersports – MB
- Silver Thatch Watersports – Silver Thatch II
- Silver Tuna Sport Fishing
- Simon Says Charters
- Sin Priza – Snorkeling Tour
- Sinbad – Hanse 370
- Singing Reel Charters
- Sip N Sea Charters – Fun In The Sun!
- Sip and Sea Charleston
- Sip and Sea Charleston
- Siracusa by Boat
- Siren Sailor
- Siren – 60' Iconic Luxury Yacht
- Sirena Moris
- Sirena – Splav & Brod