Garmin GPSMAP 192C User Manual

Page 77

GPSMAP 192C Owner’s Manual

AIN

ENU

NITS

• Heading—selects the reference used in calculating heading

information. You can select from Auto Mag Var, True, Grid,

and User Mag Var. Auto Mag Var provides magnetic north

heading references that are automatically determined from

your current location. True provides headings based on a

true north reference. Grid provides headings based on a grid

north reference (and is used in conjunction with the grid

position formats described on page

). User Mag Var allows

you to specify the magnetic variation at your current location

and provides magnetic north heading references based upon

the variation you enter.

To enter a user deﬁned magnetic variation:

1. With the

Heading ﬁeld set to User Mag Var, highlight the

heading reference ﬁeld (immediately to the right), and press

ENTER.

2. Use the

ROCKER to enter the magnetic variation at your

current location, and press

ENTER.

WARNING: If User Mag Var is selected, you must periodically

update the magnetic variation as your location changes. Using

this setting, the unit does not automatically calculate and

update the magnetic variation at your present location. Failure

to update this setting can result in substantial differences

between the information displayed on your unit and external

references, such as a magnetic compass.

Manually enter a

magnetic variation.

• Distance, Speed and Elevation—select the units of measure

for distance, speed, and elevation readouts in Nautical

(nm, kt, m), Statute (mi, mh, ft), or Metric (km, kh, m) terms.

• Depth—select units of measurement for depth in Feet (ft),

Fathoms (fa) or Meters (m).

• Temperature—select the units of measure for temperature

in Fahrenheit (°F) or Celsius (°C).