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NMEA Data
NMEA Settings
Configure how the NMEA interface works with settings on the NMEA Menu. Select NMEA Data
from the Main Menu or when in NMEA mode, select Menu to see the following OSD menu.
Radar cursor (RSD): When this option is enabled, you can control the camera
by using the cursor on the radar display screen to highlight a target. The camera will
track (point toward) whatever target is selected by the cursor. Moving the cursor to a
different target will move the camera to the new target (see note below). The camera
will continue to follow the cursor until this option is disabled from the main menu. This
function is implemented with NMEA RSD messages.
When the camera is in this mode, an icon is either briefly or continuously displayed, depending on
the setting of Icon Display Mode.
Note: The camera points toward the cursor position for the dwell time period (a minimum of 10
seconds). If the cursor is moved during that time, the camera will not move immediately to the new
position. It will ignore all other RSD messages (produced when the cursor is moved to another
position) until the dwell time expires. Then it will respond to the next RSD message received.
Next Waypoint (BWC): When this option is enabled, the camera will move to a
preselected waypoint when that waypoint gets to within approximately 3 mile (5 km),
based on waypoint location information from the NMEA BWC messages. When the
camera is in this mode, an icon is either briefly or continuously displayed, depending
on the setting of Icon Display Mode.
For example, while en route the operator could designate a buoy, an island or any other landmark
as a navigation waypoint and the camera will point toward it automatically when in range. The
camera will remain on the target for the specified dwell time. If an additional BWC message is
received, the camera will point to the newer BWC heading for an additional dwell time period.
Radar target (TTM): When this option is enabled, the camera tracks selected
radar targets using data from NMEA Target Tracking Messages (TTM) provided by
the radar unit. When the camera is in this mode, an icon is either briefly or
continuously displayed, depending on the settings of Icon Display Mode.
While it is possible to select up to 100 targets to be tracked by M400 (refer to the radar or GPS
documentation on how to designate a target), typically the operator selects five or less. Once
targets are selected, the camera will point toward each sequentially, and track it using position
data sent from the radar unit.
The camera points at each target for a preset amount of dwell time (10 seconds by default) before
moving on to the next target. The dwell time is determined by the setting of Radar Target Dwell.
Due to the way radar operates, it is possible to lose a target momentarily. To ensure that the
tracking process continues after the momentary loss of a target, the TTM function maintains the
last known position of the target in its queue for 60 seconds after receiving the last valid message.
After the 60 seconds has lapsed, that target is removed from the queue.
432-0012-00-10 Version 110
www.
June 2016
information@itm.com
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