
1) Afoot 2) Current 3) Currently in progress 4) Engaged in a voyage 5) Going ahead 6) Happening 7) Happening now 8) In full swing 9) In progress 10) In train in tunnel 11) Nautical terminology 12) No longer at rest 13) On the go 14) On the move 15) Taking place
Found on
https://www.crosswordclues.com/clue/underway

1) Afoot 2) Current 3) Going on
Found on
https://www.crosswordclues.com/clue/underway

Underway, or Under Way is a nautical term describing the state of a vessel. A vessel is said to be underway if it meets the following criteria: If a vessel is adrift and not being propelled by any instrument or device, it is said to be underway, not making way. The concept of whether a vessel is or is not underway has important legal ramifications...
Found on
http://en.wikipedia.org/wiki/Underway

Vessel in motion, i.e., when not moored, at anchor, or aground.
Found on
http://www.boatsafe.com/nauticalknowhow/gloss.htm

When the boat is in moving through the water under its own power,
Found on
http://www.diy-wood-boat.com/Boating-terms.html

Vessel in motion, i.e., when not moored, at anchor, or aground.
Found on
http://www.encyclo.co.uk/local/21453

Vessel in motion, i.e., when not moored, at anchor, or aground
Found on
http://www.encyclo.co.uk/visitor-contributions.php

Vessel in motion, not moored or aground
Found on
http://www.sailinglinks.com/glossary.htm

Vessel in motion, i.e., when not moored, at anchor, or aground.
Found on
http://www.scale-modelers-handbook.com/nautical-terms.html

The act of sailing
Found on
https://www.encyclo.co.uk/local/22636
No exact match found.