
On the right side of the lower left window you will find
the Speed Over Ground (SOG, calculated by MX421 smart
GPS antenna), Speed Log (LOG, the NMEA 0183 or pulse
speed input), and the Waypoint Closure Velocity (WCV).
WCV reflects the real time velocity from your present
position and course towards the next waypoint. The VMG
and WCV are calculated from GPS data. Refer to the
diagram below to see a graphical representation between
VMG and WCV.
Present
Position
SOG 13 Kn
Beginning
Wa yp oi nt
Next
Wa yp oi nt
Original Cour se Line
Actual
Course
Line
VMG
Towards
Waypoint
10
Kn
BRG
Effect of
Set & Drift
6297_01B.100
Present
Position
SOG 13 Kn
WCV 9 Kn
Beginning
Wa yp oi nt
Next
Wa yp oi nt
Original Cour se Line
BRG
&
RNG
Extended
Course
Line
WCV is based on
Extended Cour se
Line (COG), SOG,
BRG & RNG to WPT
Effect of Set & Drift
HTS to
counter
Set & Drift
Velocity Made Good:
Distance to
Waypoint Travelled
Waypoint Closure V elocity:
Below this information, you will find your Set and Drift
data, which is calculated using GPS and your compass
and speed sensor inputs.
Reset XTE and Skip Waypoint, described at the end of
NAV2, is also available in NAV4.
The window on the right displays depth information com-
ing from the depth sounder unit using the NMEA 0183
record of DPT, DBS, DBT, or DBK. These are setup in the
CFG1 Depth screen, refer to the Advanced operation
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