Kilo User Manual Version 3.0
23
Water Submergence and Surfacing
The Kilo employs a water sensor, used to detect when the device returns to the surface after a
submergence session.
There are two conditions which must be met before the Kilo will detect that it is submerged:
1.
The Kilo must be fully submerged underwater
2.
Iridium transmission must fail 3 consecutive sessions
After both conditions are met, the Kilo will enter Underwater Mode, and continuously take water
sense readings in anticipation of surfacing. The time the device takes
Surfacing Alert
If the Kilo detects a transition from underwater to surface it will send an SBD message indicating
that event. Following surfacing, the Kilo will transmit once every 10 minutes for 1 hour, followed
by a return to its Normal Operating Mode.
Surfaced: true
There are two conditions which must be met before the Kilo will initiate a Surfaced event:
1.
A change in the internal water sense reading of the Kilo, where the latest reading is at
least 10% lower than the rolling average of previous readings. This event queues the
Iridium check-in.
2.
An Iridium check-in session (containing the above Surfaced message) is attempted. If this
message is not successfully sent, the device re-enters underwater mode. Due to this, it is
imperative that the top of the Kilo is not obscured from sending messages.
A back-up 24-hour timer is present during Underwater Mode to decrease events of un-noticed
surfacing.
