The ships' horns could be heard some nine miles away in Brechin.
Fees will be suspended at the three remaining hospitals that still charge for parking.
Jeane Freeman told MSPs the NHS in Scotland is being placed on an 'emergency footing'.
Nicola Sturgeon chairs Scottish Government resilience meeting following outbreaks in Europe.
Only 83.8% of patients were seen within four hours, despite the target being 95%.
Analysis found more than 2.7m lost bed days in the five years up to November last year have cost the taxpayer £653m.