Wreck of Mercator
Protected Area
Bullers of Buchan Coast
Why dive here
With 140+ marine species recorded in the area - including blue whales, dolphins, dwarf minke whales, humpback whales and ocean sunfish (mola mola) - Wreck of Mercator offers some of Scapa Flow, Orkney's richest wreck diving. Water ranges 8-14°C, warmest July, August, September.
The Mercator is pure Scapa Flow character, a trawler sitting upright on a sandy bottom, broken but still whole enough to give you a real sense of its past life. We love how the deck machinery is still so identifiable, the winches and davits almost ready for another day’s fishing. Swim through the holds, which are surprisingly open and easy to navigate even for less experienced wreck divers, or peek into the superstructure. It's a fantastic training ground for getting comfortable inside overhead environments. Look for the resident pollack and cod darting in and out of the shadows, and we often find various colourful anemones clinging to the plates, a nice splash of colour against the rusted steel. The visibility here can be decent, especially on a settled day. We’d suggest a dive with a good torch; it really brings out the textures and the life tucked into every corner. Mercator offers a classic Scapa dive without the depths or currents of some of the bigger blockships, making it a great option for a second dive or for newer wreck enthusiasts.
Safety Notes
Wreck site - avoid penetration without wreck diving certification. Watch for sharp metal and entanglement hazards.
Cold water this month (avg 13°C). Drysuit or thick wetsuit (7mm+) recommended.
Reviews for Wreck of Mercator
Conditions
Ocean conditions, forecast and tides for Wreck of Mercator
Wreck of Mercator Ocean Conditions
Monthly averages for Wreck of Mercator, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (58.64, -3.16) (8km away)
October Averages
Sea Temperature
13°C
55°F · Range: 11.4–13.8°C
Air Temperature
10°C
50°F
Wind Speed
9.26 m/s
18.0 knots
Atmospheric Pressure
1005.3 hPa
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data
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