Yep. And her communication "plan" was poorly coordinated and led to disaster.
I read a good book about it. Lots of research in it. The island had radio and telegraph and they were supposed to transmit at 15 min intervals iirc and alternate between the two. Radio at noon, morse code at 12:15, radio at 12:30, etc. But their telegraph (or radio) went out. But - the US Navy had a ship anchored off the island so they used their telegraph.
After she went missing they investigated things. Turns out the ship was on Hawaii time which iirc was some interval of 15 minutes off of island time. And - the plane would have been using the time from it’s last takeoff point which was also at odds with the ship (and/or the island). They also thought that Earhart (new to using the radio) may have had the unlabelled switch from radio to morse in the wrong position each time.
Anyway - after the investigation is when it was established that all ship and plane communication would use Greenwich Mean Time.