| Event | Year | Start | End | Races | Teams |
|---|---|---|---|---|---|
| Letzte Helden | 1998 | 14 Nov | 15 Nov | 5 | 17 |
| Salamader Bay Regatta | 1998 | 14 Nov | 15 Nov | 4 | 22 |
| Grand Slam & Berliner Meisterschaft | 1998 | 31 Oct | 01 Nov | 3 | 16 |
| Hoosier Regatta | 1998 | 24 Oct | 25 Oct | 7 | 9 |
| Petermännchen | 1998 | 17 Oct | 18 Oct | 3 | 14 |
| Finale II | 1998 | 10 Oct | 11 Oct | 4 | 32 |
| Kehraus-Regatta | 1998 | 03 Oct | 03 Oct | 4 | 28 |
| Oktoberfestpreis | 1998 | 26 Sep | 27 Sep | 1 | 17 |
| Osnabrück | 1998 | 19 Sep | 20 Sep | ||
| World Championship | 1998 | 19 Sep | 25 Sep | 8 | 106 |
| Flottenmeisterschaft Nordost | 1998 | 12 Sep | 13 Sep | 4 | 21 |
| Spéciale 505 | 1998 | 12 Sep | 13 Sep | 6 | 22 |
| Pre-Worlds | 1998 | 12 Sep | 17 Sep | ||
| Pacific Coast Championship | 1998 | 29 Aug | 30 Aug | 5 | 18 |
| Sommerschlußregatta | 1998 | 29 Aug | 30 Aug | ||
| Swiss Championship | 1998 | 29 Aug | 30 Aug | 10 | 25 |
| Eastern Canadian Championship | 1998 | 28 Aug | 30 Aug | 9 | 19 |
| Belgium Open Championship | 1998 | 26 Aug | 27 Aug | 6 | 39 |
| Midwest Championship | 1998 | 22 Aug | 23 Aug | 7 | 20 |
| Möhne Cup | 1998 | 22 Aug | 23 Aug | 3 | 18 |
| Hospice Regatta | 1998 | 15 Aug | 16 Aug | 6 | 12 |
| No Name | 1998 | 15 Aug | 16 Aug | ||
| North American Championship | 1998 | 14 Aug | 15 Aug | 4 | 89 |
| Fleet 4 Second Series | 1998 | 12 Aug | 13 Aug | 4 | 7 |
| 505er Regatta | 1998 | 08 Aug | 09 Aug | ||
| Fishing Bay Annual | 1998 | 08 Aug | 09 Aug | 6 | 7 |
| UK National Championship | 1998 | 08 Aug | 14 Aug | 7 | 39 |
| Zimbabwe Championship | 1998 | 01 Aug | 01 Aug | 12 | 9 |
| Gim Hobelman | 1998 | 01 Aug | 02 Aug | 8 | |
| Oberlandpütz Seeshaupt | 1998 | 01 Aug | 02 Aug | 3 | 23 |
| East Coast Championship | 1998 | 31 Jul | 02 Aug | 8 | 26 |
| Euro Cup – Hayling Island | 1998 | 24 Jul | 26 Jul | 6 | 35 |
| Travemünder Woche | 1998 | 22 Jul | 25 Jul | 7 | 35 |
| Felixstowe Ferry | 1998 | 18 Jul | 19 Jul | 4 | 8 |
| Ontario Championship | 1998 | 18 Jul | 19 Jul | 11 | 8 |
| Svenskt Mästerskap | 1998 | 13 Jul | 15 Jul | 5 | 11 |
| Kitsilano Invitational Regatta | 1998 | 11 Jul | 11 Jul | 8 | 14 |
| High Sierra Regatta | 1998 | 11 Jul | 12 Jul | 3 | 13 |
| Summer Race | 1998 | 11 Jul | 12 Jul | ||
| Championnat de France | 1998 | 11 Jul | 14 Jul | 9 | 64 |
| Pokalregatta – Sommerregatta | 1998 | 04 Jul | 05 Jul | 3 | 15 |
| Saarland Meisterschaft | 1998 | 04 Jul | 05 Jul | ||
| Canadian Championship | 1998 | 03 Jul | 05 Jul | 6 | 33 |
| Internationale Deutsche Meisterschaft | 1998 | 02 Jul | 05 Jul | ||
| WRSC One Day 505 Regatta/Open House | 1998 | 27 Jun | 27 Jun | 4 | 11 |
| Champagner-Regatta | 1998 | 27 Jun | 28 Jun | ||
| St Francis Regatta | 1998 | 27 Jun | 28 Jun | 6 | 15 |
| Dansk Mesterskab | 1998 | 26 Jun | 28 Jun | 5 | 15 |
| Euro Cup – Nieuwpoort | 1998 | 26 Jun | 28 Jun | 6 | 39 |
| Küchenschlacht | 1998 | 20 Jun | 21 Jun | 3 | 15 |
| Nepean One Design | 1998 | 20 Jun | 21 Jun | 3 | 12 |
| Kieler Woche | 1998 | 20 Jun | 23 Jun | 7 | 28 |
| Sommerwettfahrt | 1998 | 13 Jun | 13 Jun | 4 | 16 |
| Euro Cup – Scandinavian Championship | 1998 | 12 Jun | 14 Jun | 9 | 26 |
| Baltic Jollenregatta | 1998 | 06 Jun | 07 Jun | ||
| Pfingstbusch | 1998 | 30 May | 01 Jun | 6 | 31 |
| Pfingstwettfahrten | 1998 | 30 May | 01 Jun | 4 | 20 |
| Inland Championship | 1998 | 24 May | 26 May | 8 | |
| ABYC Memorial Day Regatta | 1998 | 23 May | 24 May | 7 | 12 |
| Eck-Days | 1998 | 23 May | 24 May | 4 | 36 |
| West River MidAtlantics | 1998 | 23 May | 24 May | 3 | 9 |
| Euro Cup – Riva del Garda | 1998 | 21 May | 24 May | 7 | 36 |
| Seattle One-design Centerboard and Keelboat Series | 1998 | 16 May | 17 May | 6 | 4 |
| Hampton Trapeze | 1998 | 15 May | 16 May | 3 | 5 |
| Hoover Spring Regatta | 1998 | 09 May | 10 May | 10 | 11 |
| Richmond High Performance Invitational | 1998 | 09 May | 10 May | 5 | 14 |
| European Championship | 1998 | 09 May | 16 May | 5 | 36 |
| Auftakt Ammersee | 1998 | 02 May | 03 May | 3 | 19 |
| PreRace Euro | 1998 | 01 May | 03 May | 8 | 22 |
| Régional Est | 1998 | 25 Apr | 26 Apr | 4 | 19 |
| Santa Cruz Spring Open Regatta | 1998 | 25 Apr | 26 Apr | 5 | 15 |
| Trapezregatta | 1998 | 25 Apr | 26 Apr | 4 | 24 |
| West River Spring | 1998 | 25 Apr | 26 Apr | 6 | 10 |
| Open Meeting | 1998 | 18 Apr | 19 Apr | 5 | 18 |
| Euro Cup – Cavalaire | 1998 | 10 Apr | 12 Apr | 6 | 92 |
| Championnat du Léman | 1998 | 04 Apr | 05 Apr | 3 | 20 |
| Hiper regatta | 1998 | 04 Apr | 05 Apr | 8 | 11 |
| Kompaßregatta | 1998 | 28 Mar | 29 Mar | 16 | |
| Spring Dinghy | 1998 | 14 Mar | 15 Mar | 6 | 11 |
| Australian National Championships | 1998 | 01 Jan | 01 Jan | ||
| Midwinter Championship | 1998 | 01 Jan | 04 Jan | 9 | 32 |
| Euro Cup – Ranking | 1998 | 01 Jan | 31 Dec | 5 | 171 |