NMEA Data
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Help text: (On/Off) Help text can be displayed to provide contextual information to the user.
Unlike feedback or notification text which is always shown, the help text is controlled by this
setting.
Icon & text color: (Red/White) Icons and text can be displayed either in white or in red.
Tracking box: (Show /Hide) Select whether to display the tracking box when video tracking is
engaged.
Pilot mode: (On/Off) In managing the elevation (tilt) of the camera, the joystick can be used in
one of two modes.
Pilot mode Off: Moving the joystick forward causes the camera to tilt up. Moving the joystick
back causes the camera to tilt down. This is the factory default mode.
Pilot mode On: Moving the joystick forward causes the camera to tilt down. Moving the joystick
back causes the camera to tilt up.
User button 1, User button 2, User button 3: The User
buttons are programmable one-touch buttons on the JCU II to
quickly access common settings or functions. Use this menu to
select a function to associate with each User button from the
following choices: Stabilization (vertical only, vertical and
horizontal), Surveillance, Icon Levels, Spotlight, Polarity,
InstAlert on/off, IceAlert on/off, Mirrored view on/off, Signal
Light, or Autofocus.
NMEA Data
This section describes how to configure and use the set of NMEA interface functions supported by
the M500. The NMEA interface allows the M500 to communicate with radar, GPS, or other devices
using the National Marine Electronics Association (NMEA) 0183 protocol. NMEA 0183 (or NMEA
for short) is a combined electrical and data specification for communication between marine
electronic devices.
Additional information regarding the protocol can be found on the NMEA Web site:
http://www.nmea.org/content/nmea_standards/nmea_standards.asp.
When NMEA is being used, the M500 acts as a listener and receives messages from the main
control unit that is monitoring various sending devices in the system, such as radar, GPS, or
independent input ports. The M500 connects to the other equipment through the M500 Connection
box.
The NMEA protocol allows the camera to automatically point toward vessels and other
objects that show up on the display and to track their movement.
The M500 can receive
three types of NMEA messages.
• Radar Cursor Tracking, which is implemented using the NMEA Radar System Data (RSD)
sentence format
• Slew to Waypoint, which uses the NMEA Bearing and Distance to Waypoint, Great Circle
(BWC) sentence format
• Radar Tracking, which uses the NMEA Tracked Target Message (TTM) sentence format
Even though you can only choose three types of messages to enable through the NMEA interface,
the M500 uses additional messages to perform the calculations needed to respond to these three.
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