Next to the power plug on the side of the case are two status lights. Red light is for power, Green lights is for activity.
- RED Solid = Power On
- RED Flashing = Low voltage
- Green Solid = System On
- Green Flashing = System activity
Inside the unit, as viewed from the side vent, is a green LED to indicate GPS status. Flashing is GPS Lock, solid is searching, no light is off, and Red means error.
Please note GPS light information has change. See: https://seattleavionics.zendesk.com/hc/en-us/articles/360000032353-Merlin-GPS-Status-Light-Explained