I knew on the outward trip to Ireland from the UK that something was wrong with the calculation of the expected mileage and predicted charge levels, but this screenshot on the way back makes it clear. The M3 expects to use 20% covering 73 miles while sat on the car deck of the ferry. Which is why the suggested supercharger stops needed manual override too. ABRP seems to get it right, fortunately. And it also shows distance, predicted times and charge level at the ports automatically without any need to add those points manually as the M3 requires (useful if you want to know if you'll make the ferry too)!