Why does the avionic keep shouting “DONT SINK, DOT SINK” when I have a seaplane ? …
Regards
Cose its a plane not Uboot 
And for real:
A ground proximity warning system (GPWS )
The system monitors an aircraft’s height above ground as determined by a radar altimeter. A computer then keeps track of these readings, calculates trends, and will warn the flight crew with visual and audio messages if the aircraft is in certain defined flying configurations (“modes”).
The modes are:
- Excessive descent rate (“SINK RATE” “PULL UP”)
- Excessive terrain closure rate (“TERRAIN” “PULL UP”)
- Altitude loss after takeoff or with a high power setting (“DON’T SINK”)
- Unsafe terrain clearance (“TOO LOW – TERRAIN” “TOO LOW – GEAR” “TOO LOW – FLAPS”)
- Excessive deviation below (“GLIDESLOPE”)
- Excessively steep bank angle (“BANK ANGLE”)
- Windshear protection (“WINDSHEAR”)
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The Garmin is warning you of a negative climb rate.
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Thank you very much for your quick and precise answer 
Closing thread. OP answered.