Final answer:
Coast Guard aircraft are currently equipped with 406.025 MHz ELTs, which are used for satellite-based search and rescue operations.
Step-by-step explanation:
Coast Guard aircraft are currently equipped with MHz ELTs (Emergency Locator Transmitters) operating at the frequency of 406.025 MHz. This frequency is used for satellite-based search and rescue operations. It is a more advanced and reliable technology compared to the older frequencies, such as 121.5 MHz and 243 MHz. By utilizing 406.025 MHz ELTs, the Coast Guard can more accurately locate distressed aircraft or vessels, thus improving their ability to respond to emergencies.