Boat spearfishing is the sport with the leash taken off: offshore reefs no shore diver will ever reach, wrecks stacked with resident fish, oil rigs and FADs pulling pelagics out of empty blue — all a fuel tank away. The trade is that the boat becomes part of the dive, and boat skills become dive skills. This guide covers what a boat actually unlocks, the drift protocol that organizes most offshore hunting, how to work man-made structure, communication with the skipper, the gear changes, and the etiquette and safety that keep a deck civilized.
What a boat unlocks that shore diving cannot
Range is the obvious gift — but the real change is selection. A shore diver hunts whatever the coast happens to offer; a boat diver chooses: the offshore pinnacle at slack tide, the wreck nobody's touched since the last blow, the current line where pelagics ride. Depth opens too, from the shore diver's 5–25 m band toward 10–40 m reef, and with it bigger resident fish. Where boat diving sits in the sport's larger map — and what should come before it — is laid out in our pillar on the types of spearfishing; the short version is that boat diving amplifies whatever shore-built skills you bring aboard, including the gaps.
Drift diving protocol: drop, drift, pickup
Most offshore spearfishing runs as drifts. The boat motors upcurrent of the mark, divers roll in and the current carries the team across the structure while the boat shadows the floats downwind. The rules that make it work:
- Everyone drifts together. One diver swimming against the current to "stay on the spot" scatters the team and the pickup.
- The floats are the team. The skipper tracks floats, not heads — stay connected to yours.
- Agree on the drift's end before the drop: a landmark, a depth change or a time. Then everyone's up, counted and repositioned for the next pass.
- Long drifts are normal — offshore drifts can run kilometers. That's the method working, not going wrong, as long as boat and divers move as one system.
Hunting man-made structure: wrecks, rigs and FADs
Man-made structure is fish-aggregating by accident or design. Wrecks hold resident reef fish plus a halo of baitfish that pulls in predators — hunt the up-current end and the shadow lines, and never enter a wreck on breath-hold. Oil rigs are vertical reefs; fish stack at depth bands, so work the legs like a high-rise, floor by floor. FADs — fish aggregating devices — concentrate open-water species around a point you can actually find; hunt the perimeter where wary pelagics circle rather than the shadow directly beneath. All three concentrate other users too: anglers' lines, current shear and boat traffic come with the territory.
Working with the skipper: signals and pickup plans
The skipper is your dive buddy who happens to be dry. Before anyone's wet, settle: the drift plan and its end point, the recall signal (usually engine revs or horn), the surface signals — one arm up for pickup, both arms waving for emergency, fist on head for OK — and the approach rule: the boat comes to divers at idle, downwind, engine in neutral for the final meters, and nobody swims to a boat in gear. Repeat the brief for every new crew member, every time. The day it feels unnecessary is the day it isn't.
How your gear list changes on a boat
Boat diving lets you carry more and demands you organize it. What changes: a bigger float or boat-flown dive flag (jurisdiction depending), longer guns for the better visibility offshore (110–130 cm reef guns, or breakaway setups if pelagics are on the menu), a reel or floatline you trust at depth, spare bands, shafts and a rigging kit (no dive shop at the pinnacle), and water, food and sun cover — offshore days are long. Everything gets a place and goes back to it: a deck where loose shafts roll is a deck where someone gets hurt.
Boat etiquette and safety around props and lines
The unwritten rules that keep crews together: split fuel and fish fairly, rotate the best drop positions, gear up before your turn (the drift doesn't wait), and land your fish fast — a shot fish fought across the whole drift ruins everyone's water. On safety, the prop owns a permanent exclusion zone: approach the stern only when the engine is off or in neutral and the skipper has waved you in, keep floatlines clear of the prop during pickups, and count heads out loud on every recovery.
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