Two people have been fined a total of £6,000 by Guernsey’s Magistrate's Court for failing to self-isolate after landing in Sark earlier this month.
The pair arrived in Sark on a private vessel from France and anchored off the island on Tuesday 1 June.
The local authorities were alerted.
By going ashore, they breached COVID-19 regulations.
Between their arrival and their sentencing, the pair - aged 52 and 68 - were self-isolating on their vessel in St Peter Port.
People in Sark are being encouraged to report any suspected breaches of border restrictions to the Sark Constable.
France is classed as a Category 4 country on the Bailiwick's travel list - requiring arriving passengers to isolate until a negative Day 13 test.
Sark has remained Covid-free throughout the pandemic.


New woodland for Alderney's 80th Homecoming
Guernsey States 'in talks' with easyJet
Guernsey's airline Aurigny takes on six new First Officers
Call for more transparency over Guernsey Electricity's charges
Guernsey Police investigate 'unexplained death' in St Peter Port
Senior Guernsey politician to stay on committee during police investigation
Iconic Guernsey restaurant to close before Christmas
Protected status of Guernsey bunker changed by planners