Salvimar SPHERA High Visibility Round Diving Surface Marker Buoy with Alpha Flag

Salvimar SPHERA: High Visibility Surface Marker Buoy for Safer Diving

The Salvimar SPHERA is a high visibility round Surface Marker Buoy (SMB) designed for freedivers, spearfishermen and scuba divers who want to improve their visibility and safety while in the water.

Developed by Salvimar, one of Italy's leading manufacturers of freediving, spearfishing and scuba diving equipment, the SPHERA combines excellent visibility, durable construction and practical features in a compact and reliable buoy.

Its primary purpose is to clearly mark the diver's position at the surface, making it easier for boats and other water users to identify the diving area during freediving, spearfishing, snorkeling and recreational scuba diving.

Equipped with two signal flags, a floating line already included and a reinforced PVC and Nylon construction, the Salvimar SPHERA is ready for use straight out of the box and is suitable for both occasional and frequent diving activities.

If you would like to compare other models, explore our complete range of Surface Marker Buoys or browse all our Diving Buoys & Lift Bags.

Why Use a Surface Marker Buoy?

A Surface Marker Buoy (SMB) is one of the most important pieces of safety equipment for any diver operating in open water.

By clearly marking the diver's position on the surface, it improves visibility for boats and other water users, helping to increase overall safety during freediving, spearfishing, snorkeling and scuba diving.

Before every dive, always check the local regulations and safety requirements applicable to the diving area.

Why Choose a Salvimar Surface Marker Buoy?

For more than fifty years, Salvimar has been designing innovative equipment for freediving, spearfishing and scuba diving. The SPHERA reflects this experience by combining durable materials, practical features and excellent visibility into a buoy designed for demanding marine environments.

Its quality construction, reinforced materials and attention to detail ensure long-lasting reliability, even with frequent use in saltwater conditions.

High Visibility in All Sea Conditions

The round profile, bright colours and dual flag configuration make the Salvimar SPHERA easy to spot, even in sunlight reflections, small waves or slightly rough sea conditions.

With a diameter of 360 mm (14.2 in) and an above-water height of approximately 500 mm (19.7 in), it offers an excellent balance between visibility, buoyancy and portability.

Its compact dimensions also make it easy to transport whether diving from shore or from a boat.

Dual Signalling: Alpha Flag and Diver Down Flag

The Salvimar SPHERA features both an International Code Alpha Flag and the traditional Diver Down Flag, providing excellent surface visibility and making the buoy easy to identify.

This dual-flag configuration is appreciated by freedivers, spearfishermen and recreational scuba divers looking for maximum visibility while diving.

Built to Withstand Marine Environments

The buoy features a durable internal PVC air chamber protected by a reinforced Nylon outer shell, providing excellent resistance against abrasion, UV exposure and the demanding conditions typically encountered in marine environments.

A reinforced Cordura webbing with an integrated attachment ring allows the floating line and compatible accessories to be securely connected while maintaining excellent durability.

25 m Floating Line Included

The Salvimar SPHERA comes complete with a 25 m (82 ft) floating line with a diameter of 6 mm (0.24 in), allowing immediate use without purchasing additional accessories.

The floating line helps maintain a secure connection between the diver and the buoy while reducing the likelihood of the line sinking or becoming entangled on the seabed.

To complete your diving equipment, you may also be interested in our range of Lift Bags and our complete selection of Surface Floats & Rafts.

Recommended Activities

The Salvimar SPHERA is a versatile Surface Marker Buoy (SMB) designed to provide excellent visibility and increased safety during a wide range of underwater activities.

Its durable construction, high-visibility design and included floating line make it suitable for both recreational divers and experienced freedivers looking for a reliable surface marker.

Why Choose a Round Surface Marker Buoy (SMB)?

The choice between a round Surface Marker Buoy (SMB) and a torpedo-style buoy depends on the type of diving and personal preference.

The Salvimar SPHERA features a traditional round profile that offers excellent buoyancy, superior stability on the surface and outstanding visibility, making it particularly suitable for freediving, spearfishing and recreational scuba diving.

Complete Your Diving Equipment

Complete your diving setup with equipment specifically designed for your underwater activities.

Browse our complete selection of Surface Marker Buoys (SMBs) or explore our full range of Diving Buoys & Lift Bags.

If you need equipment recovery or underwater lifting solutions, discover our range of Lift Bags.

For additional surface support equipment, browse our collection of Surface Floats & Rafts.

Technical Specifications

Frequently Asked Questions

What is a Surface Marker Buoy (SMB) used for?

A Surface Marker Buoy (SMB) is designed to clearly indicate the diver's position on the surface, improving visibility and increasing safety during freediving, spearfishing, snorkeling and scuba diving.

Why does the SPHERA feature both an Alpha Flag and a Diver Down Flag?

The combination of the International Alpha Flag and the traditional Diver Down Flag provides excellent visibility and makes the diving area easier to identify by other water users.

Is the floating line included?

Yes. The Salvimar SPHERA is supplied complete with a 25 m floating line (6 mm diameter), allowing immediate use without purchasing additional accessories.

Is the buoy resistant to saltwater?

Yes. The internal PVC chamber and reinforced Nylon outer cover are specifically designed to withstand frequent use in harsh marine environments.

Can it also be used for snorkeling?

Yes. Although primarily designed for freediving, spearfishing and scuba diving, it is also an excellent safety accessory for open-water snorkeling.

What are the advantages of a round SMB?

A round Surface Marker Buoy provides excellent buoyancy, superior stability on the surface and outstanding visibility, even in light waves and choppy sea conditions.

Can I attach additional accessories?

Yes. The reinforced Cordura attachment point allows the floating line and compatible accessories to be securely connected.

Is the buoy supplied ready to use?

Yes. The Salvimar SPHERA comes complete with the 25 m floating line already included, making it ready for use straight out of the box.

The Salvimar SPHERA is a high-visibility Round Surface Marker Buoy (SMB) designed to improve diver safety during freediving, spearfishing, snorkeling and scuba diving. Its dual-flag configuration, reinforced construction and included 25 m floating line make it a durable, reliable and ready-to-use solution for every dive.