NorthStar MX500 Operator's & Installation Manual page 265

Glossary
IEC
IMO
INCLINED PLANE
INITIALIZE
INTERFACE
IONOSPHERE
IONOSPHERIC INTERFERENCE
ITDMA
ITU
KALMAN FILTER
KEY LOCK
Version 3.0
International Electro-technical Commission.
International Maritime Organization
A geometric surface that is tilted with respect to another arbitrary
reference plane (for example, the Earth's equatorial plane).
To enter constants into the navigator to enable it to start position-
ing and/or navigating accurately.
Electronic circuits that permit the passage of data between differ-
ent types of devices; For example, the speed and heading interface
circuit permits data from a speed log and compass to pass to the
navigator processor.
A layer of ionized air about 80 kilometers (50 miles) above the earth's
surface.
Distortion imparted to a broadcast radio signal as it passes through
the ionosphere.
Incremental Time Division Multiple Access – Access protocol for
pre-announced transmissions of temporary or non-repeatable
character. It is also used during data link network entry.
International Telecommunication Union.
A software routine that produces the navigation solution (see NAVI-
GATION SOLUTION).
Disabling the EDIT-key so that data entries cannot be inadvert-
ently made.
Operator's Manual
251