Can anybody relate their experience please, as to how rough this overnight sea crossing might be? We would perhaps like to include the Shetlands in our trip (from Australia) but have heard that ONE of the ferry crossings is very rough, and makes travellers extremely sea-sick - I am guessing that it could be this one, across the North Sea. Alternatively, has anyone left their car at Aberdeen airport and flown across (not much difference in price) and if so, were you able to hire a car for the day on Shetland, or is there some other means of getting around? Walking is not high on our agenda - myself aged 59 with 2 hip replacements last year. This is my first ever posting - thanks for any advice!