Miss Granger displays her many talents for the benefit of muggle and non-muggle.

Harry Potter and his companions followed the muggles for a ways, trying to decide how best to inform them that a very evil wizard might imminently be about to kill them. Ron thought that the direct approach would be best. Hermione felt that being raised by muggles, she and Harry would have a better understanding of their psychology and the problems with such an approach. Harry was inclined to agree, but felt his proximity could be nothing but a danger to all involved. Nevertheless, leaving was not an option until they located the horcrux.
For this and other reasons, the three young wizards were not as anxious to be rescued as they presumed the other survivors were.(11) Hermione, in particular was concerned that muggle media could bring unwanted attention to the crash and that the hijacked Ministry of Magic might be monitoring such things with more attention than was their usual habit.(12)

"We have something we need to tell you," Hermione finally said, being won over by the arguments of her two companions. "I know this may be hard for you to believe, but there is someone very dangerous after us. It-"

"Yeah! No kidding!" Charlie interrupted. "We saw what it did to the pilot. Are you getting any signal on that?" he asked Jack who was messing with the transceiver.
"No," Jack said.
"Well, pardon me for appearing desperate, but you heard what the pilot said, before he was ripped to shreds by whatever it was that these kids have reminded us is out there."
"Did you see it?" Kate asked.
"It was right behind us, but no," Charlie said. Jack just shook his head and kept messing with the transceiver. Kate looked at the kids expectantly.
"Er, no. We didn't actually see anything."
"Here, let me have a look at that. I'm good with machines," Hermione suggested. Jack was not inclined to, but she took it before he could object. She pulled her wand so quickly and so subtly that even Ron hardly saw her. "Reparo!"
She handed it back to Jack. "We're getting some sort of transmission," he said. Everyone moved closer to hear. "Let me adjust the frequency."
"It's the rescue party. It has to be," Charlie said. "It's the French! I've never been so happy to hear French! The French are coming!"
"Does anyone here speak French?"
"17294532... 17294533..."
"It's a woman. The same recording is repeating over and over again," said Hermione, "It must be on a loop. If that's how many times it's repeated, the message must have been playing for more than 16 years!"
The others paused to do the math in their head. "What's she saying?" Charlie asked, "Doesn't anyone know French? We don't know how much longer the battery will last."
"She's saying, 'I'm on the island alone now. The others are dead. They're all dead. It killed them. It killed them all.'" Hermione said.
"Are you sure?" Harry asked.
"Since when do you know French?" Ron asked.
Hermione looked indignant. "I learned it before the Triwizard's tournament. I wanted to be able to speak with the Beauxbaton students in their own language."
"Oh, did you learn Russian too, then?"
"Ron! He's not Russian."
"Look! We don't care how you know French or who's Russian or not," Charlie interrupted. "Who's dead? What killed them? Are you sure that's what she said?"

(11)Actually it is estimated that at least one out of every ten survivors did not want to leave the island.

(12)She was both right and wrong. The Ministry of Magic had become anti-muggle in those days. There was disdain for almost everything to do with muggles. Research and monitoring of muggle technologies and politics had sharply dropped off. Conspiracies to do with muggles "stealing" magic from wizards were rampant. Though the news held little interest for them, the following celebrities of muggle television were sought after: Galdalf the grey (wanted for conspiracy with muggles), Frodo Baggins (stealing a magical artifact rightfully belonging to a wizard), Saruman (arming of potentially dangerous beasts), and Eglantine Price (enchanting a muggle artifact).This last is acknowledged as a serious and as yet unresolved crime. Any wizard with information regarding the enchanted bedknob, articles of clothing, or suits of armor; are asked to come forward. Such objects could pose a serious risk to the safety of muggles and are no joking matter.