xgpsspeed(1) on Linux
The text 4d5764be6e7a, as Debian 3.1 (Sarge) shipped it.
interface daemon for GPS receivers, test client, and speedometer
Flags it lists
-
-D -
-N -
-P -
-S -
-T -
-d -
-h -
-i -
-n -
-p -
-s -
-v