The reason we ask for your boat dimensions is to show you routes you navigate safely. Bridges you can pass through will appear in green on the map view.
If your boat is too wide or too high, you will see a red bridge symbol instead. And if you have to modify your boat to pass – for instance, if you have to fold up the mast – you'll see an orange bridge symbol.
To set the dimensions of your boat, go to your profile (option at the top right of the app next to the search bar). Then, from the section ‘Maps’, select the ‘My boat’ option.