125mm 125mm 123mm
LOCATION
Device attempts to acquire the precise, GPS satellite-based position
just before each connection. To obtain a GPS position, a clear 360
degrees view to the horizon is recommended, which is seldom the
case. Thus, the GPS position is not always available, especially when
the Device is indoors.
If the GPS signal is reected from buildings and other objects, the
GPS position might be shied up to tens of meters. In extreme cases
the actual location of the device may even be outside the reported
accuracy.
In case there is no GPS position available, a GSM tower based location
is reported. The accuracy of a GSM-tower based location is from a few
hundred meters to several kilometers.
CONNECTION INTERVALS
Device connects to the network and reports the data only at pre-set
intervals. Default interval is 1 hour. By placing the device on the charger,
it reboots, giving the current location and starting a new interval cycle
from the moment of plug-in.
If the network connection fails, there is a battery saving mechanism;
the next connection attempt takes place aer a delay which is
2 x default connection interval. This will conserve battery over long
periods of network outage, such as on a marine trip. The sensor data
acquisition continues seamlessly also during these oine periods and
data is provided in the next connection.
DATA ACQUISITION
Device includes GPS module for precise positioning, accelerometer for
collision detection and temperature and humidity sensors. Location
information, environmental information and collision detection status
are reported in every connection, as well as battery level.
Temperature and humidity information is acquired continuously. In
each connection two values are reported: minimum and maximum
since previous report.
Collision information is also acquired continuously. Minor acceleration
events are not reported thus if the device movement is gradual without
any sudden incidences, it might be that the reported acceleration
values are zero. Collision detection considers not only the peak value,
but also the duration of the acceleration. The motion event with the
highest impact since previous report is reported.
Battery level in % is reported from a moment just before the report. It
is an indicative value only and there may be some variation.
