Great tool!
Give the comment on the to-come speed of movement, am I right in that what I'm seeing right now are the conditions along the route but seen at a chosen instant in time?
If so, adding the speed of movement would be great. Can I suggest that each leg - between waypoints - should be able to have a different speed set. This would (for boats!) allow for tidal differences and wind effects when going around headlands and simply over time for tide near shore.