SMBs, Reels & Spools

Reels, spools and surface marker buoys are the kit that gets you seen and gets you back. The range here runs from compact finger spools to full guide reels, plus closed and open DSMBs, marker tubes and open-water tow floats. Apeks, Beaver Sports, XDEEP, YASI, Halcyon and Garmin are all stocked, so you can match a spool, a buoy and a bolt snap that actually work together.

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What a spool, a reel and a buoy each do

Three pieces of kit, one job: making sure the boat knows where you are, and that you know how to get back. A buoy marks you on the surface. Line connects you to it. The spool or reel manages that line so it runs out cleanly and comes back without a tangle. Get one of the three wrong and the other two stop helping.

Finger spools

A finger spool is the simplest thing in this collection and the one most divers reach for. No moving parts, nothing to jam. The YASI finger spools are machined from anodised aluminium with a 3cm finger hole and flared sides so you can hold them in thick gloves, and they run a high-visibility orange flat line with a yellow leader section and an anti-tangle swivel. The Apeks LifeLine Spool takes the same idea and colour-codes each length, so you can tell at a glance which one you have clipped on. The Apeks Lifeline Halo Spool is the large-diameter version, built for controlled buoy deployment and quick retrieval with gloves on.

Reels

When you need to lock the line off, you need a reel. The Apeks Lifeline Ascend Reel is built around buoy deployment, with an integrated SMB attachment point and a handle you can reconfigure for left or right hand. The Apeks Lifeline Guide Reel is the overhead-environment tool, with an oversized locking screw you can turn in gloves and a textured friction plate for adding tension by hand. The Beaver Puffin Mini Wreck-Line Reel is the compact choice, with a thumb-operated ratchet and a rust-free stainless retaining clip. The Beaver Digi Line Finger Reel sits between the two categories: a micro reel wound with marine-grade cord and supplied with a double-ended bolt snap.

Choosing a surface marker buoy

Closed and open designs

A closed DSMB seals at the bottom and keeps its air once inflated. The XDEEP Closed DSMBs come in 90 cm and 140 cm, both bright orange and both compact enough for a BCD or drysuit pocket. The Apeks Surface Marker Buoy uses a fully closed oral inflator you can work one-handed in gloves, with a stainless D-ring for clipping to your spool and brass eyelets at either end so it can double as a float. An open-bottom buoy such as the XDEEP Opened simple DSMB fills from your exhaust and is fast to deploy, but it will not hold its air if it goes over on the surface.

Height, colour and reflective tape

Height is what gets you spotted from a boat deck in a swell, and orange is what gets you spotted at all. The YASI Surface Marker Buoy carries SOLAS-A reflective tape at the top along with diver-below signage and an over-pressure release valve. The Apeks Surface Marker Buoy has SOLAS reflective tape on both sides plus a reflective logo print. The Beaver Surface Marker Tube is the stripped-back option: heavy-duty orange with a self-sealing inflation valve and an elasticated cord that rolls it away small. The Beaver Delayed Surface Marker Buoy With Reel adds a line that changes from orange to yellow, giving you a visual depth cue while you are hanging on it.

The hardware that makes the difference

The parts you notice on a bad day are the small ones. Bolt snaps: YASI fits a 90mm double-ended snap in 316 stainless, Apeks includes a stainless bolt snap with its spools, and Beaver uses rust-free stainless throughout. Swivels: both Apeks and YASI put one between line and spool so the line cannot twist itself into a knot as it pays out. Line attachment: Apeks sews its line to the spool rather than tying it, which takes out the weakest point. Over-pressure relief valves let a closed buoy vent as it rises rather than split. The Halcyon Oral Inflate DAM adds a No-Lock connector so you can inflate orally or from a low-pressure hose, and comes in more than one colour if you want to use colour to signal something specific.

Surface support and open water

Two products here sit outside the usual spool-and-buoy pairing. The Garmin Descent S1 Buoy is a surface monitoring device rather than a marker: it uses Garmin's SubWave sonar to pass preset messages between divers and up to a surface team, and feeds depth, tank pressure and dive status to the Garmin Dive app. It suits dive schools, charter boats and teams running training. At the other end of the range, the YASI Swim Buoy Tow Float and YASI Dry Bag Tow Float are for swimmers and snorkellers rather than divers: a bright float on an adjustable waist belt, with the dry bag version carrying a 28-litre waterproof compartment for keys, a phone and dry clothes.

Frequently asked questions

Which SMB, reel and spool brands does Oyster Diving stock?

Apeks, Beaver Sports, XDEEP, YASI, Halcyon and Garmin, alongside an own-brand SMB & Reel Package from Oyster Diving Equipment. Apeks designs and builds its Lifeline spools and reels in the UK. Beaver Sports covers finger reels, wreck-line reels, marker tubes and delayed surface marker buoys. XDEEP makes closed and open DSMBs. YASI supplies anodised aluminium finger spools, a surface marker buoy and open-water tow floats. Halcyon brings its Oral Inflate DAM, and Garmin's Descent S1 Buoy sits at the surface-monitoring end of the range.

What is the difference between a spool and a reel?

A spool has no moving parts. It is a single machined or moulded disc that sits on a finger while the line runs out, and you wind it back by hand. The YASI finger spools and the Apeks LifeLine and Lifeline Halo spools work this way, and flared sides let you keep hold of them in thick gloves. A reel adds a frame, a handle and a locking screw or ratchet, so you can stop the line under tension and retrieve it one-handed. The Apeks Lifeline Ascend and Lifeline Guide reels and the Beaver Puffin Mini Wreck-Line Reel are all reels. Most divers start with a spool for sending up a buoy and add a reel when they want longer line or a guideline they can lock off.

Should I choose a closed or an open DSMB?

A closed DSMB is sealed at the bottom, so once it is full it holds its air and stays standing if it tips on the surface. The XDEEP Closed DSMBs and the Apeks Surface Marker Buoy are built this way, and both carry an over-pressure relief valve so they can be sent up from depth without bursting. An open-bottom buoy such as the XDEEP Opened simple DSMB is filled from your regulator exhaust or octopus and is quick to deploy, but it can spill air if it falls flat. If you are buying one buoy to cover everything, a closed design is the more forgiving choice.

How much line do I need on my spool or reel?

More than the depth you expect to deploy from. Current pulls the buoy away from you as it rises, so the line runs at an angle rather than straight up, and a spool that only just reaches the surface will be dragged out of your hand. The YASI finger spools come in 15m, 30m and 45m, the Apeks LifeLine Spool is colour-coded across four lengths so you can identify it at a glance, and the Apeks Lifeline Ascend Reel is offered in 30 and 60 metre versions. For laying a guideline in an overhead rather than sending up a buoy, the Apeks Lifeline Guide Reel carries 120m.

Is there anything here for snorkelling or open water swimming?

Yes. The YASI Swim Buoy Tow Float and the YASI Dry Bag Tow Float are surface floats that clip to a waist belt and follow behind you on a leash, keeping you visible to boats and other water users. The dry bag version adds a 28-litre waterproof compartment for keys, a phone and dry clothes. Both are surface kit rather than diving buoys, so they are not a substitute for a DSMB you can send up from depth.

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