71
Getting Started
Main Page Sequence
71
Reference
The following additional formats are available:
• hddd.ddddd° – latitude/longitude in decimal degrees only
• hddd°mm’ss.s” – latitude/longitude in degrees, minutes, seconds
• UTM/UPS – Universal Transverse Mercator / Universal Polar Stereographic grids
• British Grid • Dutch Grid • Finnish KKJ27 • German Grid
• India Zones • Irish Grids • Loran TD • Maidenhead
• MGRS • New Zealand • Qatar Grid • RT90
• Swedish Grid • Swiss Grid • Taiwan Grid • User Grid
• W Malayan RSO
For additional information on Loran TD setup, see page 80.
• Depth – lets you select the desired units of measure for depth in Feet (ft), Fathoms (fa) or Meters
(m). You must be receiving NMEA Sonar depth data or using a Garmin Sonar Module for the Depth
to display.
• Map Datum – allows you to manually select the datum reference used to determine a given posi-
tion. 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 on pages 78-79), you should only change the datum if you are using a map or
chart that specifi es a different datum.
WARNING: Selecting the wrong map datum can result in substantial position errors.
• Temperature – lets you select the desired units of measure for temperature in Fahrenheit (°F)
or Celsius (°C). You must be receiving NMEA Sonar temperature data or using a Garmin Sonar
Module for the Temperature to display.
• Distance, Speed and Elevation – lets you select the desired 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.
• Pressure – allows you select the desired units of measure for weather readouts in ‘Inches Mercury’
(in), ‘Millibars’ (mb), or ‘Hectopascals’ (hPa). You must be using a Garmin Weather product for this
data to display.
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WARNING: If ‘User Mag Var’ is selected, you must peri-
odically update the magnetic variation as your position
changes. Using this setting, the unit does not automatically
calculate and update the magnetic variation at your pres-
ent position. Failure to update this setting may result in
substantial differences between the information displayed
on your unit and external references, such as a magnetic
compass.
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The Units tab settings affect how navigation information is
displayed on the GPSMAP 3006C/3010C. 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 3006C/3010C match that of the map or chart.
This information should be displayed 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.
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Main Menu: System Tab
