This post is inaccurate. Neither WiFi nor GPS use FHSS, nor is Lamarr anything close to singularly credited with FHSS' invention (the earliest patent is credited to Nikola Tesla). This also implies that the Allies used her parent - they did not.

Also Richard Easton is the son of the man who invented GPS and had every right to be skeptical of this claim, and it looks like Internet dipsh*ts have bullied him into deleting his twitter account over this.

From the wiki page

During the late 1930s, Lamarr attended arms deals with her then-husband arms dealer Fritz Mandl, "possibly to improve his chances of making a sale".[41] From the meetings, she learned that navies needed "a way to guide a torpedo as it raced through the water." Radio control had been proposed. However, an enemy might be able to jam such a torpedo's guidance system and set it off course.[42] When later discussing this with a new friend, composer and pianist George Antheil, her idea to prevent jamming by frequency hopping met Antheil's previous work in music. In that earlier work, Antheil attempted synchronizing note-hopping in the avant-garde piece written as a score for the film Ballet Mechanique that involved multiple synchronized player pianos. Antheil's idea in the piece was to synchronize the start time of identical player pianos with identical player piano rolls, so the pianos would be playing in time with one another. Together, they realized that radio frequencies could be changed similarly, using the same kind of mechanism, but miniaturized.[4][41]

This is mostly wrong: while she did invent what would later be called Frequency Hopping Spread Spectrum (FHSS), it isn't used in modern WiFi or in GPS. It is used in Bluetooth though.

I should point out that techniques like FHSS are only a part of what makes up a radio communication method. You can't say it was "the basis of Bluetooth" just because FHSS is one of the many technologies used in Bluetooth. She certainly contributed though.