To see your coordinates within the Navigation Widget:

From home screen, click down arrow 3 times > OK > down arrow 2 times.

https://www8.garmin.com/manuals/webhelp/GUID-802DEF62-EBB2-463C-8C51-C58FB29F89E3/EN-US/GUID-D6543C2C-57AC-4ECE-B444-FE8D608A601B.html

Before location is found, the screen will be empty, only showing some lines and a mountain icon.

Choose your position format at: Settings > System > Units > Position Format. link