Non-functional. Navica is not an all-in-one app: you actually perform the test with a proctor through a browser on the emed site. That site has serious technical problems; this is the fifth test I've performed and each one had audio/visual difficulties. I used an HP laptop (camera issues) and Google Pixel 4a (mic input non functional). This time I have to find a COVID test in the airport because emed/Navica failed me. I hope you all have better luck!