Garmin gpsmap 298 Manuale Utente

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•   Distance, Speed and Elevation—allows you to select the 

units of measure for distance, speed, and elevation readouts 

in Nautical (nm, kt, ft), Nautical (nm, kt, m), Statute (mi, 

mh, ft), or Metric (km, kh, m) terms.

•   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 70

). User Mag Var allows 

you to specify the magnetic variation at your current location 

and provides magnetic north heading references based on the 

variation you enter.

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 shown on your unit and 

external references, such as a magnetic compass.

Manually enter a 

magnetic variation.