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interval can be configured to be 2, 4, 8, 16 or 32 minutes. The default is 8 minutes. You can
find out the interval that your Osprey is using by selecting the About, Configuration option
(see page 30).
•
Outbox: Temporarily stores messages you have composed, pending successful
transmission, which occurs when there is a GPS fix. Messages in the Outbox are
transferred to Sent Items when ViewPoint acknowledges receipt and are also deleted when
you switch off the Osprey.
•
Sent Items: Archives messages that have been successfully transmitted from the Outbox
and acknowledged by ViewPoint. You can view and delete messages in Sent Items at any
time.
Note: All messages to or from other Ospreys are routed via ViewPoint.
Message Limits
The Inbox and Sent Items folders can between them contain a maximum of 64 messages (split in any
combination between the two folders). If the limit is reached, the oldest message is deleted in favour
of a new message to maintain this limit.
The Outbox can contain a maximum of 8 messages, with the oldest message being deleted in favour
of a newer message to maintain this limit.
Understanding the Communication Cycles
To get the best performance from your Osprey, it is helpful to understand how and when the Osprey
communicates with ViewPoint. The sequence of operation is as follows:
1.
At the start of each scheduled communication period
acquiring both the Inmarsat and GPS satellites. During this time, the following icons appear
and flash:
Antenna and signal strength icon for the Inmarsat satellite. Three bars indicate
that optimal signal strength is being achieved. One bar may not be sufficient to
send or receive messages.
GPS icon.
2.
When the Inmarsat satellite has been acquired and a GPS position fix obtained, the icons
stop flashing and remain steady. The signal strength icon may fluctuate, even if you are in
the same position; this is normal.
A tracking position message is sent and/or any messages sent to you are received,
depending on the tracking and message receive intervals configured in ViewPoint.
3.
At the end of the communication period the antenna and GPS icons switch off. The Osprey
now remains dormant until the beginning of the next scheduled period to conserve battery
power.
1
The interval between scheduled communication periods is configurable in ViewPoint, to provide the
optimum balance between communication rate and battery life. The default is 8 minutes. The tracking
and message receive intervals can be different. The tracking interval can be within the range 2
minutes to 1 day (or off). The message receive interval can be within the range 2 to 32 minutes. You
This document contains information that is proprietary and confidential to EMS Global Tracking (one or more of the following: EMS Global Tracking Ltd and EMS Technologies
Canada, Ltd), and is supplied on the express condition that it is not to be used for any purpose other than the purpose for which it was issued, nor is it to be copied or
communicated in whole or in part, to any third party other than the recipient organization, without the prior written permission of EMS Global Tracking.
MAN-0053 Issue 3
Osprey Personal Tracker
Operator Manual
© 2010 EMS Global Tracking Ltd, EMS Technologies Canada Ltd.
Getting to Know
1
the Osprey 'wakes up' and begins
the Osprey
17 of 36
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