Watch Circle; Enabling The Watch Circle; Setting The Watch Circle - Xeos XMR Series User Manual

Watch Circle

The watch circle functionality allows users to monitor the position of their mooring by receiving
alarm messages when it exits a user-defined circle. This feature aids in the recovery of moorings
that could break free from their planned position.
Recognition of a watch circle exit is tied to the GPS interval of the device in Normal Mode (Timer
0); once a GPS position is logged that shows the device is outside the circle, the device
immediately transitions to Alarm Mode (Timer 2) and transmits according to Alarm Mode timer
intervals.

Enabling the Watch Circle

The watch circle is disabled by default, but can be enabled by the following command:
The device will respond with a Switch message in ASCII showing watch circle (component C) is
moved to the Y (yes) column.
Once functionality is enabled, the specifics of the user's circle can be implemented.

Setting the Watch Circle

The watch circle parameters can be set by sending the $setcircle command using this format:
The minimum Radius is 50 meters, while the maximum is 15000 meters.
Example:
$setcircle 47.56989 -53.55682
a) $setcircle is the command
b) Latitude is set to
c) Longitude is set to
d) Radius is set to 100
Upon implementing the watch circle, the Rover will return an S-Type message (see below):
Once the watch circle is set, the unit will operate normally until it approaches the watch circle
radius, at which point the device will send a warning message. Once the device exits the watch
circle radius, it will begin sending alarm messages with GPS coordinates every 10 minutes (Timer
2) until the unit re-enters the watch circle, the radius is expanded via command, or is turned off.
Notes
 A maximum of 24 GPS positions can be included in a single SBD transmission. Unlike other
settings, the watch circle's details are erased at each power up.
 Watch circle alert, watch circle warn and inverted mode use the same timer.
 You can adjust the Watch Circle's radius alone by setting the latitude and longitude
parameters to 0, followed by the new radius.
XMR User Manual 1.1
$WCenable 1
$setcircle Latitude
Note:
100
If a watch circle is not set by command, but
functionality is enabled, the XMR will place its centre
on the average locations so far acquired (up to
47.56989
positions 48 hours old) and the default radius of
-53.55682
100m.
meters
Longitude Radius
21