You should check the route before starting to navigate.
A few hackers from China who called PanguTeam tweeted about an iOS security flaw that gives them control over the app, and they can change routes to users. The horror scenario is that hackers will create heavy traffic and accidents while controlling the navigation app.
We discovered multiple security issues in @waze on iOS. We tried many ways to contact @waze but got no response. A brief description and one of demo can be found here https://t.co/iq7RRrMDGI , @waze, pls take a look.
— PanguTeam (@PanguTeam) June 1, 2018
The hackers in their blog post wrote about 2 main ways to attack the Waze app, The first is by remote denial-of-service. The second way is manipulation of waze (There is a video in the blog post). Waze is a company managed by Google who bought them for $1 Billion, which is based in Israel, Waze is among the most popular navigation apps around the world.
Most of waze technology in now implanted in Googles maps app, while Waze concentrates on Car pool features.