Sounds like when I press the “Mark” button on my Garmin GPSMAP 60CSx, it saves that location as a waypoint which you can rename if it suits. I can see why having the nav function in a phone would be useful, as long as it’s quick and doesn’t require the app to consume lots of energy draining the battery. That’s one reason for my preference of a dedicated GPS and keeping my not-so-smart phone in airplane mode or even off until it’s needed. You might need to navigate and communicate rather than choosing one over the other.
$.02