| | GUE Instructor Trainers (IT) |
| (ITs can offer only the first endorsement during instructor development) |
| Thomas Jonsson | OW, Master Diver, Fundamentals |
| Dorota Czerny | Tech 1 |
| Zsolt Szilagyi | OW, Fundamentals |
| JP Bresser | Cave 1 |
| Gunnar Midtgaard | Tech 1 |
| Derk Remmers | OW, AOW, Master Diver, Fundamentals, Tech 1, JJ-CCR Tech 1, Symbios CCR Fundamentals |
| John Kendall | Fundamentals, JJ-CCR Tech 1 |
| Fred Devos | OW, Fundamentals, Cave 1 |
| Kyungsoo Kim | Tech 1 |
| Henning May | OW, Fundamentals |
| Martijn Blommaert | OW, AOW, Fundamentals |
| Annika Persson | Fundamentals |
| Jin Hui | Tech 1, JJ-CCR Fundamentals |
| Meredith Tanguay | Fundamentals |
| Peter Gaertner | OW, AOW, Fundamentals |
| Andrew Couch | OW, Fundamentals |
| Duncan Paterson | Fundamentals |
| David Lee | Tech 1 |
| Mark Devoldere | OW, AOW |
| Anne-Marie Bresser | OW, AOW, Fundamentals |
| Osama Gobara | Cave 1 |
| Francesco Cameli | OW, AOW, Fundamentals |
| Lauren Wilson | OW, AOW, Fundamentals |
| Dimitris Fifis | Symbios CCR Fundamentals |
| Jon Kieren | OW, AOW, Fundamentals |
| | |
| | GUE Instructor Evaluators (IE) |
| (IEs can provide either the first or second endorsement during instructor development, but never both) |
| Chris Le Maillot | Fundamentals, Cave 1, 2, SM, DPV 1, DPV Cave |
| Gideon Liew | OW, AOW, Master Diver, Fundamentals, DPV 1, Tech 1, 2, Gas Blender |
| David Rhea | PSCR, Cave 1, 2 |
| Danny Riordan | OW, AOW, Fundamentals, DPV 1, DPV Cave, Cave 1, 2 |
| Richard Walker | OW, AOW, Master Diver, Fundamentals, DPV 1, Tech 1, 2 |
| JP Bresser | OW, AOW, Master Diver, Fundamentals, Documentation Diver, DPV 1 |
| Dorota Czerny | OW, AOW, Master Diver, Fundamentals, DPV 1 |
| Kirill Egorov | OW, AOW, Master Diver; Fundamentals; DPV 1; Cave 1, 2, SM; Tech 1, 2; JJ-CCR Fundamentals, Tech 1, Tech 2, Cave |
| Fred Devos | Underwater Cave Survey |
| Mark Messersmith | Fundamentals, DPV 1 |
| Gunnar Midtgaard | OW, Fundamentals |
| Graham Blackmore | OW, AOW, Master Diver; Fundamentals; DPV 1; Tech 1,2; JJ-CCR Fundamentals, Tech 1, Tech 2 |
| John Kendall | OW, AOW, Master Diver, Gas Blender, Photogrammetry, JJ-CCR Fundamentals, Symbios CCR Fundamentals |
| Irene Homberger | OW, AOW, Fundamentals, DPV 1 |
| Diogo Paulo | OW, AOW, Fundamentals, Scientific Diver, DPV 1 |
| Meredith Tanguay | OW, AOW |
| David Lee | OW, AOW, Master Diver, Fundamentals |
| Kyungsoo Kim | OW, AOW, Master Diver, Fundamentals, DPV 1 |
| Ricardo Constantino | OW, AOW, Fundamentals |
| Gemma Thomas | OW, AOW, Fundamentals |
| Annika Persson | OW, AOW |
| Jin Hui | OW, AOW, Fundamentals, DPV 1 |
| Derk Remmers | JJ-CCR Fundamentals |
| Liam Allen | OW, AOW, Master Diver, Fundamentals |