Yeah...I've got one of those in my brain.
I met a lady once (sans implants) who could, by using her hand, tell where power conduits ran behind walls. I had this confirmed by the building's chief engineer. That said, EM produces all kinds of VERY BAD health problems, ranging from psychosis, DEEP DEPRESSION, fainting spells, to what manifests as a "seasonal-type" allergy.
Your friend may one day regret this.