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Rev. D 1 — Introduction
1 — Introduction1 — Introduction
1 — Introduction Page 5
Five keys on the 941X instantly select the most commonly used func-
tions, as described below:
POSITION
displays position coordinates as
1) GPS lat/lon coordinates
2) loran TDs, if you have a loran receiver interfaced to the unit
3) or calculated “Phantom Loran
” TDs if you don't.
Speed- and Course-Over-Ground, and Time and Date are also displayed.
An alternate position screen plots your position graphically, along with
any nearby waypoints and your track history.
STEER
shows how to steer precisely along a course line to your current
waypoint. It also displays your Cross Track Error, Estimated time to
waypoint, Estimated Time of Arrival, Course Over Ground, Speed Over
Ground, Speed of Advance, etc.
(
) (The
STAR
key) displays alarm conditions and tide information,
and accesses setup functions for customizing the operation and displays
of your 941X, including screen brightness.
WAYPTS/ROUTES
lets you enter or access waypoints and routes for
navigation.
NAV LOG
displays the progress of your current navigation plan (today’s
trip) and lets you modify it.
In addition to these function keys, the
SAVE/MOB
key instantly saves
your position as a waypoint, and provides a Man Overboard function for
returning to the saved point.
Five
MENU KEYS
on the right edge of the display are used to select be-
tween specific choices displayed on the screen.
The nation’s GPS system has received much publicity, often described as
providing the ultimate in navigation accuracy for all applications. Its
major advantage over all other commercially-available navigation sys-
tems, including loran, is its all-weather, worldwide availability and
ab-
solute accuracy
. (
Absolute accuracy
refers to the ability of a navigation
device to determine your actual latitude and longitude coordinates on
the surface of the earth, as compared to position information determined
Functions
Comparing GPS
and Loran