Lowrance electronic LMS-334c iGPS - Manual (Page 109)

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The Navigation with Sonar page.
When navigating to a waypoint, your ground speed, track, distance,
bearing to the waypoint and course are all displayed.
NOTE:
Remember: when Speed, Track and Position information displays
are flashing, satellite lock has not been achieved and no position fix
has been determined. A question mark will also flash on the pres-
ent position arrow in the center of the compass rose.
Speed (ground speed) is the velocity you are making over the ground. (If
you want, you can customize the Speed data box to display Closing
Speed instead. Closing Speed is also known as velocity made good. It's
the speed that you're making toward the waypoint. For instructions,
see the Customize Page Displays entry in Sec. 8.)
Track is the heading, or the current direction you are actually travel-
ing. Bearing is the direction of a line-of-sight from your present position
to the destination. No matter what direction you are steering, the
Bearing window shows the compass direction straight to the destina-
tion from your location at the moment. Distance shows how far it is to
the waypoint you're navigating toward.
The Off Course window shows the current cross track error. This shows
the distance you are off-course to the side of the desired course line. The
course line is an imaginary line drawn from your position when you
started navigating to the destination waypoint. The course line is shown on
the Navigation Page screen (and the Map Page screen) as a dotted line.