Reel — What It Is and Why It Matters

A dive reel is a spool of line used for deploying surface marker buoys, laying guide lines in overhead environments (wrecks, caves), running search patterns, and maintaining distance reference during decompression stops. Reels range from small finger spools (15 to 30 meters of line) for SMB deployment to large primary reels (60 to 150+ meters) for cave and wreck penetration.

Good reel technique is essential for safety — a tangled reel line can cause entanglement, uncontrolled ascent (if attached to a buoy), or loss of the guide line in an overhead environment. Cave diving training emphasizes reel skills extensively.