We do not use the Navica app. We use our laptops for testing - so much easier than an iPhone as you have to use both hands and tilt the camera during certain parts of the testing procedure. Each person testing much set up their own account through emed/Navica prior to departing for trip, however. When testing you log on to emed.com, click start testing, which directs you to log into your personal acct via Navica to execute the proctored test. Test results sent to both Navica app/account and villa email. Results are password protected so you need to then screenshot the results if using the app or download into printable PDF if using email. Buy extra tests in case there are issues with the tests or you need to test again due to travel delays or a positive test. We traveled with two extra per person.