Magellan GPS PROMARK X, User Manual

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Getting Started
ProMARK X
2-13
Obstructions Block the Signals
If you often operate in a sheltered or covered station, consider using the
optional external antenna. The external antenna can be permanently
mounted to any flat surface, temporarily attached to a flat surface with a
magnetic mount, or screwed onto a range pole. The antenna's operating
power is provided by the unit. The connection between the external antenna
and the unit is made with a single cable; no couplers or additional connec-
tions are required.
NOTE
The external antenna increases the power drain on the unit's
batteries, reducing their useful life. We recommend connect-
ing to external power when using the external antenna.
Collecting An Almanac
The almanac is a schedule of satellite availability that is maintained by all
satellites and is updated as required by the GPS system operators to reflect
current conditions. (GPS is controlled and operated by the U.S. Air Force for
the Department of Defense. The U.S. Coast Guard serves as a source of GPS
information and as a point of contact. Refer to
Appendix 1 for a description
of GPS.) The unit collects almanac information from any satellite and stores