Chapter 5: Operation
75
The steering instruction for the BDI display uses the deviation from
vessel bearing to waypoint bearing to instruct you to turn the vessel
towards the target waypoint. This is different from the steering
instructions in all other display modes, which use the XTE to assist you in
steering the vessel back towards the rhumbline between origin and
destination.
The steering instruction is
STEER PORT
if the waypoint line is 1° or more
to port,
STEER STARBOARD
if the waypoint line is 1° or more to starboard
or
ON
COURSE
if the waypoint line is dead ahead. If no GoTo or Follow is
in progress, the steering instruction is
NOT TRACKING
, no steering arrows
are shown, but the rhumb line indicator is shown.
The graphical steering indication will place arrows either side of the
steering instruction and pointing towards it dependent on the difference
between COG and bearing to Waypoint. The first arrow is shown when
the difference reaches 5° and thereafter at 5° intervals.
Waypoint Data
The Waypoint Data display comprises text data occupying the whole
screen.
Figure 5-7: Waypoint Data
ROUTE
"CURRENT"
"HILLHEAD"
COG 313°T TIME 02:15 10/07/04
BRG 313° T
RNG 3.76 nm
WAYPOINT 01
SOG 5.0 Kts TTG 00:47
XTE 0.02nm ETA 03:02 10/07/04
STEER STARBOARD
> l
D6243-2
