ACR Electronics SARLink SOS-300 User Manual page 20

Tracking (Iridium only)
Tracking menu allows user to enable tracking, disable tracking, set the report rate, set the
Icons
position report format, select brevity codes, and view the unit reporting data.
On/Off is used to set the SARLink SOS-300 tracking mode. The SARLink SOS-300 immediately turns the GPS
receiver on to acquire a GPS fix and then attempts to transmit a position report. The next position report is
sent automatically based on the reporting rate set using Tracking/Reporting Rate.
Reporting Rate - Used to set the report frequency (time between reports) when tracking is enabled. A
predefined rate or a custom user-entered rate can be entered.
Format - The SARLink SOS-300 can transmit position reports in 30-byte format or 10-byte format, as well as
PECOS. The 30-byte format includes UTC date, UTC time, latitude, longitude, altitude, speed, course, vertical
velocity, number of satellites used to obtain 3-D fix, HDOP and VDOP. The latitude and longitude are recorded
with ~0.18 meters resolution.
The 10-byte format includes UTC time, latitude, longitude and PDOP. With UTC date omitted, the SARLink
SOS-300 relies on the NOC server to record the date. Encryption cannot be used with the 10-byte format.
Latitude and longitude are recorded with ~1.1 meters resolution. The 10-byte format is selected for the
purpose of airtime cost-saving.
By pressing the Brevity icon, the user has the option to select any one of sixteen Brevity Codes (0000 through
1111) to be included in the PECOS Message Structure (PMS) tracking reports. These codes are represented by
A(z), B, C(z) and D and can be selected via the touchscreen. Each code will light up as a green dot inside the
Brevity icon when selected.
Block Reporting is used to control the sending of tracking messages that contain an invalid GPS position;
choosing "Do Not Block Any Reports" will allow all tracking messages to be sent even if the GPS position is
invalid; choosing "Block Invalid GPS Reports" means that a tracking message with an invalid GPS position will
not be sent.
Data Log is used to enable and disable the logging of tracking reports; choosing "Enable Data Logging" means
that all tracking reports will be logged regardless of whether the tracking report was successfully sent or not;
choosing "Disable Data Logging" means that tracking reports are no longer logged.
Statistics – Records and keeps track of date/time, your GPS position, altitude, speed, course, vertical velocity
the number of satellites, and horizontal accuracy.
A countdown timer to the next report is shown beside Time to Next and is replaced with Off when Track
On/Off is disabled.
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