Hiking in Tatra Mountains is very popular. When the weather is good you will find a lot of people on the trails. Although you cannot see it, the trails are very well and frequently marked on the rocks and even though the terrain may look deserted it would be difficult to get lost.
If you do find yourself uncertain of where to go, wait a few minutes and a fellow hiker will inevitably appear on the road and you can ask for directions. Most people, anyway, have maps with them on the trails and I would not be surprised if in our era there was a useful hiking app 😉 No coverage though. Too high and too far from any tower 😉