Garmin GPSMAP 96 Owner's Manual - Page 119

Map Datum, Heading, Auto Mag Var, User Mag Var, Mag Var, provides magnetic north heading references

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Main Menu >  WARNING: Selecting the wrong map datum can result in substantial position errors. When in doubt, use the default WGS 84 datum for best overall performance. Map Datum-allows you to manually select the datum reference used to determine a given position. The default setting is WGS 84. The unit automatically chooses the best datum depending upon your chosen position format. Datums are used to describe geographic positions for surveying, mapping, and navigation and are not actual maps built in the unit. Although over 100 datums are available (as listed in the Appendix), you should only change the datum if you are using a map or chart that specifies a different datum. Heading-allows you to select 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 position. True provides headings based upon a true north reference. Grid provides headings based on 96/96C Owner's Manual 111

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96/96C Owner’s Manual
²²²
M
AIN
M
ENU
>
Map Datum
—allows you to manually select the
datum reference used to determine a given position.
The default setting is WGS 84. The unit automatically
chooses the best datum depending upon your
chosen position format. Datums are used to describe
geographic positions for surveying, mapping, and
navigation and are not actual maps built in the unit.
Although over 100 datums are available (as listed in
the Appendix), 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. When in
doubt, use the default WGS 84 datum for best
overall performance.
Heading
—allows you to select 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
position.
True
provides headings based upon a true
north reference.
Grid
provides headings based on