NorthLink’s ferry Hrossey left Lerwick three-and-a-half hours late last night due to engine problems.
The vessel had been due to leave at 5.30pm to sail to Aberdeen via Kirkwall, but eventually left at 9pm.
This morning Hrossey was due to arrive in Aberdeen at 7am but arrived just over two hours later at 9.10am.
A spokesman for NorthLink said the engine problem had been “nothing major”. It was fixed locally and will not require further attention.
He added that passengers on board were offered complementary tea and coffee during the delay.