This isn't normal. NATO Boeing E-3 Sentry patrolling open waters https://en.wikipedia.org/wiki/Boeing_E-3_Sentry Dozens of military helicopters: https://en.wikipedia.org/wiki/Sikorsky_S-92 AgustaWestland 139's are typically used for search and rescue, though have military applications. https://en.wikipedia.org/wiki/AgustaWestland_AW139
Transponders going off for a few as they go over the water.
This isn't normal.
NATO Boeing E-3 Sentry patrolling open waters https://en.wikipedia.org/wiki/Boeing_E-3_Sentry
Dozens of military helicopters:
https://en.wikipedia.org/wiki/Sikorsky_S-92
AgustaWestland 139's are typically used for search and rescue, though have military applications.