Current Reading for Drift Divers: A Field Guide
No dive plan survives first contact with a running tide. The ability to read a current on the surface — and adapt mid-dive — separates comfortable drift divers from anxious ones.
## Surface signs
Look for the slick — a glassy band of water where two current directions meet. Debris lines up along slicks. The slick is often a cleaning station below the surface.
## Tidal timing
Check the tidal chart the night before and again at breakfast. Build a 30-minute buffer around slack water. Indonesian, Philippine, and Micronesian sites rarely behave exactly as the chart predicts — local bathymetry bends the tidal flow.
## Subsurface signals
Decending into blue and feeling a thermocline from below is a sign of upwelling. Upwelling = nutrients = pelagics. Stay at the thermocline boundary and scan the blue.