If your mast height is anything above 65' then it is impractical to travel the ICW, , unless you are willing to wait, potentially for a week or more, for low water
to allow clearance of various fixed bridges. Even at 65' there are a few bridges, two come to mind, that will often be impassible for long periods, providing only 64' of clearance most of the time.
When I say anything over 65', that is in the range of 65' to 67'. I think a Lagoon
450 is like 70' so just expect to never get under any 65' fixed bridge. Plan your inshore stops. Many, perhaps even most, good East Coast inlets have anchorages
accessible without passing under a bridge, but you will be excluded from many more anchorages
just beyond some 65' bridge.
From the practical standpoint of making the journey north/south up/down the East Coast the ICW is a nice option. Weather
that would be very uncomfortable offshore
is a non-event on all of the ICW other than some of the larger sounds. Still, it is easy enough to make the journey all on the outside with just a series of single
day and single
. If you accept a moderate level of offshore
sea state the time required is probably about the same on average with time spent waiting for acceptable weather offshore made up for by sailing offshore overnight. Most do not travel the ICW at night.