I have an FMC920 on a boat wired and configured so that it is considered to be moving when battery power is on.
For lengthy periods the boat will be on a mooring with the battery off and I know where it is so I don’t need GPS location reports. Periodically the battery is switched on, the boat goes off and does something, locations are reported and I know where it is. That’s all fine.
At the end of the day the boat goes back to its mooring, the battery is switched off and I have the device configured to go into ultra deep sleep, which it does.
But the thing is that the boat is, when on its mooring, always moving if only slightly. The accelerometer detects this, takes it out of UDS and it starts (pointlessly) reporting again.
Is there a way to make sure it stays in UDS, such as turning off the accelerometer? Or damping the accelerometer so it ignores relatively small movements?
I hope you’re doing well. In the Movement Source settings, you can configure the device to use Ignition, Accelerometer, or GNSS.
If you’re using an accelerometer, you can adjust the delay settings to allow the device to detect movement after a specified period. Alternatively, you can switch to Ignition or GNSS as the movement source.
Thanks for your reply. I understand about Movement Sources and the one I am using is Ignition.
However my question was about waking up from Ultra Deep Sleep. If my reading of your documentation is correct, and after experimentation I think it is, the accelerometer will wake the device from UDS regardless of Movement Source.
So if the device is in a boat that is ‘parked’ on its mooring and the boat moves around a bit,which they always do, then the accelerometer will detect this and wake it up. That means that it will report pretty much continuously, more so than when not in UDS! Until the internal battery is exhausted, if course.
The 60s accelerometer delay isn’t going to help. What’s needed is a way to disabled the accelerometer so the device stays in UDS until ignition is turned on again.
