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.
Absolutely brilliant! Don't keep it a secret!