Proposed launch sites, frequency of measurements, number of payloads annually (48 - 64 total):
| Site | Latitude | Frequency | Number/year | Activity |
|---|---|---|---|---|
| Utqiagvik, Alaska (or Sodankylä, Finland) | 78 °N (or 67 °N) | Seasonally | 4-6 | active |
| Boulder, Colorado | 40 °N | Bi-monthly | 24 | active |
| Hilo, Hawaii | 20 °N | Seasonally | 4-6 | active |
| San Pedro, Costa Rica (or Guam) | 10 °N (or 14 °N) | Seasonally | 4 | active |
| Quito, Ecuador | 0° | Seasonally | 4-6 | planned additions |
| American Samoa | 14 °S | Seasonally | 4 | planned additions |
| La Réunion Island, France | 21 °S | Seasonally | 4-6 | IOP; active |
| Lauder, New Zealand | 45 °S | Monthly | 6-12 | active |
| McMurdo Station / Scott Base, Antarctica | 78 °S | Seasonally | 2-4 | active |