KVH Industries eTrac ユーザーズマニュアル

Inmarsat-C is a store-and-forward mailing system that enables you to send and
receive data to and from mobile terminals via the Inmarsat-C system. Four
geostationary satellites provide worldwide coverage. Satellite data link coverage is
excellent between 70º North and 70º South. Because the polar regions cannot be seen
from geostationary satellites, these regions are not covered.

The Inmarsat-C system is capable of:

•

Transmitting data to and from a mobile unit.

•

Broadcasting data to groups of mobile terminals.

•

Managing position reporting from fleets of mobile units.

•

Requesting data from the mobile units via a unique system polling
application.

The Inmarsat-C system has two satellite station types that are of interest to eTrac
users: the Network Coordination Stations (NCS) and the LES. The Inmarsat-C system
has an NCS controlling each of the four ocean regions:

•

Atlantic Ocean Region East,

•

Atlantic Ocean Region West,

•

Indian Ocean Region, and

•

Pacific Ocean Region.

Each ocean region is served by a single geostationary satellite.

Before using the Inmarsat-C system, eTrac must be registered in one of the four ocean
regions. This is done by instructing the eTrac system to login to one of the four NCSs
by launching easyMail and selecting Options-> Login as illustrated in Figure 3-1 on
the following page.