Leica MX400 Operating Instructions Manual page 217

Operator's Manual
pass to the navigator processor.
IONOSPHERE
A layer of ionized air about 80 kilometers (50 miles) above the
earth's surface.
IONOSPHERIC INTERFERENCE
Distortion imparted to a broadcast radio signal as it passes
through the ionosphere.
KALMAN FILTER
A software routine that produces the navigation solution (see
NAVIGATION SOLUTION).
KEY LOCK
Disabling the E-key so that data entries cannot be inadvertently
made.
LAYLINE
The term is relevant for sailboats only. You are on a layline if
you by sailing close hauled on either tack will reach your next
waypoint. There is one starboard and one port layline. If your
actual position is somewhere between the laylines, you should
stay between or on the laylines in order to get faster to the
waypoint.
LEG
One of the stages in a route
LEEWAY
The leeward drift of the vessel from the true course due to wind.
LOCAL TIME ZONE
The time zone (see TIME ZONE) in which the navigator is
located.
LOCAL TIME ZONE OFFSET
The number of hours by which the local time zone differs from
Universal Time Coordinated.
LORAN-C TIME DIFFERENCES (TDs)
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Glossary
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