gmttrack(1gmt) on Linux
The text fd325a9b734d, as Debian 8 (Jessie) shipped it. The page shows this text now.
A shiptrack plotting program
Flags it lists
-
-A -
-B -
-Da -
-Db -
-J -
-K -
-M -
-O -
-P -
-R -
-Sa -
-Sb -
-U -
-V -
-W -
-X -
-Y -
-c