What is the recommended squawk code for flights over water outside of 15 nautical miles from land?

The recommended squawk code for flights over water outside of 15 nautical miles from land is 4000. This code is specifically designated for use in certain circumstances, particularly in areas where aircraft may not be in contact with air traffic control. When operating over water and beyond a safe distance from land, pilots are encouraged to use this squawk code to help maintain situational awareness and improve the ability for search and rescue operations, should they be necessary.

Selecting 4000 helps distinguish these flights from those operating within more controlled environments and enhances the overall safety of aviation operations over less monitored areas. It is important for pilots to understand the appropriate use of squawk codes as part of their navigation and communication responsibilities.