Garmin 198c sounder Manuale Proprietario

GPSMAP 198C Sounder Owner’s Manual

AIN

ENU

NITS

Units Tab

The Unit tab deﬁnes the Position Format, Map Datum, Heading,

Distance, Speed, Elevation, Depth, and Temperature units.
The following settings are available:

• Position Format—changes the coordinate system. You

should only change the position format if you are using a

map or chart that speciﬁes a different position format or want

to use a format you are familiar with.

For additional information on Loran TD setup, see page

NOTE: The Units tab settings affects how navigation

information appears on the GPSMAP 198C Sounder. When

in doubt, seek assistance. If you are using a map or chart in

conjunction with your GPS, make sure the settings under the

Units tab of the GPSMAP 198C Sounder match that of the

map or chart. This information should appear somewhere on

the map or chart. If the information is not present, contact the

map or chart maker to determine what position format, datum,

heading and units of measure are being used for the map or

chart.

• Map Datum—sets the datum reference used to determine

a given location. The default setting is WGS 84. The

unit automatically chooses the best datum depending on

your chosen position format. Datums are used to describe

geographic locations for surveying, mapping, and navigation.

You should only change the datum if you are using a map or

chart that speciﬁes a different datum.

WARNING: Selecting the wrong map datum can result in

substantial position errors. Unless otherwise speciﬁed by

the navigation documentation you are using, use the default

WGS 84 datum for best overall performance.