My GPS unit is marginal for navigation in heavily forested areas.
Even if it can get a signal, if I'm not moving at least 2 mph, it provides no directional guidance.
A compass is essential.
Clarifying “no directional guidance” - it tells me what compass heading I need to go, but doesn’t actually tell me where that is.
If I’m moving more than 2 mph, I get a little virtual representation of a compass dial/needle pointing the way.