In addition to Ustka city, Jens sent me links to the flag and Coat of Arms of the
rural commune of Ustka, Slupsk county, Pomorskie wojwodship.
The flag is on wikipedia:
Horizontal red over blue (proportioned c. 5:6, in center the communal arms.
Arms at this webpage:
Per fess azure a sailing boat or with sails argent, gules a grasshopper
vert on a cornear or.
Jarig Bakker, 28 Jan 2008