Gili Trawangan (east side main strip)
★ 4.8(2,847 reviews)
Blue Marlin Dive Gili Trawangan is the longest-running PADI 5-star IDC center on the island and the gold standard for dive courses between open water and instructor. Expect professional multilingual instructors, a large boat fleet, and disciplined safety standards — but pay 10–20% more than budget shops. Book ahead during July–September peak season.
# Blue Marlin Dive Gili Trawangan: The Honest Review
If you ask a dozen Gili Trawangan dive professionals which shop they'd send their mother to for her open water course, eleven will say Blue Marlin. This is the island's original professional dive center, founded in 1992 when Gili T was still a fishing village, and three decades of institutional knowledge show in every detail of how they run their operation.
Blue Marlin is a PADI 5-star Instructor Development Centre (IDC), one of only a handful in Indonesia. That rating requires consistent safety audits, a minimum number of certifications issued, and qualified staff ratios. It matters because it's the difference between a shop that follows PADI standards and one that treats them as flexible guidelines.
The shop has three locations in Indonesia (Gili Trawangan, Komodo, and Lembeh) which means training continuity if you're doing a long dive trip through the archipelago. Instructors rotate between the shops, and course records transfer seamlessly.
Eight boats is a lot for a single shop on a small island, and the payoff is that Blue Marlin very rarely overloads a boat. Their cap is four to five divers per divemaster, and in practice you'll often be part of a group of two or three. Compare this to budget Gili shops where eight divers per DM is common in peak season.
Boats depart at 8:30am, 11am, and 2pm. The 8:30am departure goes to the best sites (usually Shark Point, Deep Turbo, or the Halik/Simon's reef complex) while afternoon boats hit closer sites. If you want the headline dive sites, request the morning boat when booking.
Blue Marlin's open water course runs over 3 days with 5 dives total (2 confined, 4 open water including skills demos). The pacing is efficient — expect full days from 8am until late afternoon, with classroom sessions squeezed in between dives. This isn't a lazy holiday course; it's a real PADI open water certification delivered at the standard the agency intends.
Advanced Open Water is similarly well-structured. You'll get the deep and navigation adventure dives as compulsory, plus three electives you choose from night, wreck, peak performance buoyancy, underwater naturalist, and fish ID. If you know what you want, request the electives when booking so they can plan the dive rotation.
The Instructor Development Course (IDC) is Blue Marlin's crown jewel. Multiple IDCs run per year, the course director is one of the most respected in Indonesia, and the pass rate at the instructor exam is consistently near 100%.
Rental gear is included in all courses and in fun dive packages. The equipment rotation is faster than any other Gili shop I've seen — BCDs are replaced every 2–3 years, regulators are serviced quarterly by certified technicians, and wetsuits get washed and rinsed after every dive. If you're renting BCDs elsewhere and worrying about the mildew smell, Blue Marlin is the contrast experience.
Nitrox is available (EAN32 standard, custom blends on request) for certified nitrox divers at no premium over air fills.
A standard two-tank fun dive at Blue Marlin runs 1.1 million IDR (≈$70). At a budget Gili T shop you'll pay 800,000 IDR (≈$50) for the same two-tank outing. The $20 difference buys you the small-group ratio, the maintained equipment, the safety briefings that aren't rushed, and the captain who knows how to read the currents at Shark Point.
Open water courses run 5.5–6 million IDR at Blue Marlin vs 4.5–5 million IDR at budget shops. For a certification you'll carry for life and rely on for safety underwater, the premium is worth it for almost everyone.
Book Blue Marlin if you're getting your first certification and want it done right. Book them if you're an infrequent diver who wants to refresh skills before resuming serious diving. Book them if you're working toward professional certifications (divemaster, instructor) and want pedigree on your record. Book them if you have kids learning to dive — safety is the whole calculation there.
Skip Blue Marlin if you're an experienced diver on a tight budget who just wants tank refills and a boat ride to a nice reef — a smaller Gili T shop will deliver that for less money. Skip them if you prefer a small, intimate learning environment with the same instructor for your entire course; Blue Marlin's volume means you might rotate between instructors. And skip them if you're hoping for a party-vibe dive shop — Blue Marlin is professional first, social second.
Reserve via their website or WhatsApp (+62 812 3766 0190) at least one week ahead for peak season (July–September and Christmas/New Year). For quiet season (January–March) walk-ins are fine but ask about their current boat schedule first. Deposits are typically 30% at booking, balance in cash on the day.