| GB4IMD | Cornwall, UK (Organisers) |
| GB4LD | Lizard Wireless Station, Bass Point, Cornwall, UK |
| GB0IMD | Weston Super Mare, UK |
| W1WCC | Chatham, Massachusetts, Cape Cod USA |
| W2GSB | Babylon, Long Island, NY |
| K3S | Nuclear Ship Savannah, Baltimore, USA |
| EI3IMD | Tramore, Coastguard Station |
| PA6IMD | Gouda & District Section Vernon, Netherlands. |
| KM1CC | Cape Cod Rc, USA |
| W2RTM | New Jersey Antique RC, New Jersey, USA |
| K2M | Marconi Tower, Binghamton, NY, USA |
| GB0MGY | Harlow RS, Essex, UK |
| K6KPH | Maritime Radio Historical Society, California, USA |
| G2NM | Amberley Museum ARC, West Sussex, UK |
| GB4MHS | Museum of History & Science, Oxford, UK |
| EI0MAR | Martello Tower, Dublin |
| GB0CMS | Caister Marconi Station, Lifeboat Station, Norfolk, UK |
| VK2IMD | Hornsby & District ARC, Sydney, Australia |
| OE25M | ORF Centre, Vienna, Austria |
| EI2WRC | Rosslare, Co Wexford, Marconi House |
| GB4MDI | Barry ARS, Lavernock Point, South Wales |
| IY0M | Santa Marinella, Rome |
| AO7IMD | Cadiz, Spain |
| G3SKY | The Needles, Isle Of Wight, UK |
| W2RC/IMD | Radio Central ARC, Rocky Point, New York |
| VP8VPC | Stanley, Falkland Islands |
| IY1TTM | Tigullio Torre Marconi, Sestri Levante |
| GB2GM | Poldhu ARC, Cornwall, UK |
| EI7IMD | Brow Head, Crookhaven |
| W1AA | Marion (Mass, USA) Marconi transmitter Building Site |
| GB2MRS | Marconi Receiving Station, Somerton, Somerset, UK |
| GB8MD | Telford & District ARD, Gwynedd |
| VO1IMD | Signal Hill, Newfoundland, Canada |
| 9H1MRC | Marconi Amateur Radio Circle, Malta |
| OE3KJN | Maritime Mobile, SY MARWIG OEX5495, Austria |
| GB4MPC | Marconi Point, Cullercoats, UK |
| EI1K | Kerry ARG, Ballybunion, County Kerry, Ireland |
| G2LO | Borough Hill, Daventry, UK |
| GX0MWT | Chelmsford ARS, Essex, UK |
| GB6IMD | Tri County ARC, Marconi Memorial, Ballycastle, NI |
| GB2IMD | Dragon ARC, The Old Marconi Station, Wales |
| WA3BAT | Philadelphia Museum Ship, Philadelphia, USA |
| GB0MCN | Maison Dieu, Dover, UK |
| M3KXZ | Tide Mills, Marconi Site, East Sussex, UK |
| GB2SJ | Souter Lighthouse, Tyne & Wear, UK |
