Normally they will annunciate
"LNAV" and flash a message "Approach Downgrade" if they can't offer WAAS accuracy but still have acceptable GPS position.
The GPS annunciates
the highest level of service supported by the WAAS signal, the receiver, and the selected approach.
If someone got too close to a painting, an alarm would annunciate
in the security office.
You don't know what minimums are applicable until it annunciates, which should happen passing UNSAW.
But even if LNAV/VNAV annunciates, you can fly the LNAV/VNAV glidepath down to the lower LNAV minimums, so long as you never go lower on a segment than allowed on the LNAV approach.
In the lower left screen, the receiver annunciates
LNAV+V, L/VNAV or LPV for the three categories.
Each device transmits an alarm via a low-power, digitally coded radio signal, and the control panel annunciates
The navigator does not sequence to the next waypoint in the approach, but annunciates
SUSP and continues to provide guidance along the same course as the final approach segment, extended out into infinity.
Once the gear is down and locked, it annunciates
that, too, but just once and in a sonorous airline-captain voice that reminds of us of a guy who's relaxed to the point that he sounds like he's had a couple.
The receiving unit annunciates
the status of the line supervision and alarm monitoring equipment with audible and visual indicators.
While the TAS series annunciates
traffic position, some owners will still want to see the numbers and this is, after all, the point of having that expensive display in the first place.