Having just moved my boat to Le Havre for a season or two l see you can travel up to Rouen without taking the mast down. Anyone done it? Are there any good guides for the trip?
Done it several times. Rouen Marina is excellent, bus or bike ride into town.
It's a days trip on one tide, leave at the coincidence of LW and first light to go up, navigation at night isn't allowed. Return seven or so days later at the coincidence of HW and first light.
PS A good source of info River Seine (Lower) | Detailed Navigation Guides and Maps