 | International Aquanautic Club |
| https://www.diveiac.com | Mailing Address: Borbecker Str. 249 D-45355 Essen Germany Phone: +49 201 67 00 49 |
 | NDL Nord - National Dive League (Northwest Region) |
| https://ndl-global.com/ | Mailing Address: NDL Nord Raja Tee 12, Kulna 76613, Keila V. Estonia Phone: +37 256 694 999 |
 | PADI |
| https://www.padi.com | Mailing Address: The Pavilions Bridgwater Road Bristol BS13 8AE UK Phone: +44 117 300 7234 |
 | PDA - Professional Diving Association |
| https://www.pdaww.de/en/ | Mailing Address: PDA Headquarter Körnerstr. 1a 68775 Ketsch Germany Phone: +49 6205 9079523 |
 | SSI GmbH - Scuba Schools International |
| https://www.divessi.com/en/home | Mailing Address: Johann-Höllfritsch-Str. 6 90530 Wendelstein Germany Phone:+49 9129 90 99 38 0 |
 | WOSD – World Organisation of Scuba Diving |
| https://www.wosd.com/en/ | Mailing Address: Postbus 171 7940 AD Meppel The Netherlands Tel: +31 522 242593 |