| CV-Helios Network | ||
| CV-observers in March 2019 | 38 | 655 |
| Observer number and name | Country | No. obs. |
| CV-001 KJELL INGE MALDE | NORWAY | 15 |
| CV-009 DIETER BRAUCKHOFF | GERMANY | 25 |
| CV-010 FRANKY DUBOIS | BELGIUM | 22 |
| CV-019 ELMAR JUNKER | GERMANY | 14 |
| CV-020 MANFRED HOLL | GERMANY | 15 |
| CV-021 HOWARD BARNES | NEW ZEALAND | 13 |
| CV-038 GERMAN MORALES | BOLIVIA | 28 |
| CV-040 ROBERTO BATTAIOLA | ITALY | 13 |
| CV-041 JENS ROTHERMEL | GERMANY | 5 |
| CV-044 GERD SCHROEDER | GERMANY | 18 |
| CV-068 SVEN OVE THIMM | DENMARK | 12 |
| CV-077 ANDREW JOHNSTON | UNITED KINGDOM | 16 |
| CV-080 JAN JANSSENS | BELGIUM | 2 |
| CV-082 PIOTR URBANSKI | POLAND | 28 |
| CV-086 TOS POLAND | POLAND | 31 |
| CV-091 GRZEGORZ DALEK | POLAND | 23 |
| CV-103 OCTAAF STEEN | BELGIUM | 20 |
| CV-104 LIEVE MEEUS | BELGIUM | 4 |
| CV-105 ALEXEY RYBACK | RUSSIA | 6 |
| CV-107 MONTY LEVENTHAL | AUSTRALIA | 17 |
| CV-122 VLASTISLAV FEIK | CZECH REPUBLIC | 23 |
| CV-135 GEMA ARAUJO | SPAIN | 31 |
| CV-136 FAUSTINO GARCIA | SPAIN | 24 |
| CV-139 JAVIER ALONSO | SPAIN | 25 |
| CV-151 JEFFREY CARELS | BELGIUM | 18 |
| CV-171 WALTER JOSE MALUF | BRAZIL | 26 |
| CV-177 HENDRIK DE BACKER | BELGIUM | 27 |
| CV-201 SANTANU BASU | INDIA | 19 |
| CV-202 JORDI ZAMORA | SPAIN | 27 |
| CV-203 IVO DEMEULENAERE | BELGIUM | 19 |
| CV-204 STEFAN MEISTER | SWITZERLAND | 11 |
| CV-205 TOM MANGELSDORF | UNITED STATES | 1 |
| CV-206 TADEUSZ FIGIEL | POLAND | 11 |
| CV-207 ONDREJOV OBS. (AI CAS) | CZECH REPUBLIC | 13 |
| CV-208 JOHAN NEYS | BELGIUM | 6 |
| CV-209 CAIO CRESPO MORAES | BRAZIL | 6 |
| CV-210 JEAN BOURGEOIS | BELGIUM | 24 |
| CV-211 EDWIN DE CEUNINCK | BELGIUM | 17 |