Garmin GPSMAP 640 Owner's Manual - Page 50

Spot Depths, Safety Shading

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Marine Mode: Advanced Configuration Chart Appearance-customize the appearance of the Navigation chart. • Orientation-change the perspective of the map display: ◦ North Up-set the top of the map display to a north heading. ◦ Head Up-set the top of the map display according to your GPS heading. The heading line appears vertically on the screen if it is shown. If the device is connected to a NMEA 0183 heading sensor, the map remains oriented according to GPS heading (course over ground), but the vessel icon rotates according to magnetic heading from the sensor. ◦ Course Up-set the map so the direction of navigation is always up. • Detail-adjust the amount of detail shown on the map. • Heading Line-draws an extension from the bow of the boat in the direction of travel. ◦ Off-turn off the heading line. ◦ Distance-set the distance to the end of the heading line. ◦ Time-set the amount of time until you reach the end of the heading line. • World Map-toggle the world map (basemap) between a basic world map and a full world map. ◦ The basic world map shows coastal outlines of the world, with land indicated in yellow. ◦ The full world map shows the coastal outlines of the world with the land covered in a low-resolution photo image. • Spot Depths-turn on spot soundings and set a dangerous depth. Safety Shading (with compatible BlueChart g2 Vision cards)- areas with depths shallower than the specified value are shaded in blue, while areas with depths greater than the specified value are shaded in white. The contour is always drawn at, or deeper than, the selected depth. • Symbols-customize the symbols that appear on the Navigation chart. ◦ Navaid Size-adjust the size of the symbols shown on the map. ◦ Navaid Type-set the navaid symbol set: National Oceanic and Atmospheric Administration (NOAA) or International Association of Lighthouse Authorities (IALA). 42 GPSMAP 640 Owner's Manual

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4³
GPSMAP 640 Owner’s Manual
Marine Mode: Advanced Configuration
Chart Appearance
—customize the appearance of the Navigation
chart.
Orientation
—change the perspective of the map display:
North Up
—set the top of the map display to a north
heading.
Head Up
—set the top of the map display according to your
GPS heading. The heading line appears vertically on the
screen if it is shown. If the device is connected to a
NMEA 0183 heading sensor, the map remains oriented
according to GPS heading (course over ground), but the
vessel icon rotates according to magnetic heading from the
sensor.
Course Up
—set the map so the direction of navigation is
always up.
Detail
—adjust the amount of detail shown on the map.
Heading Line
—draws an extension from the bow of the boat in
the direction of travel.
Off
—turn off the heading line.
Distance
—set the distance to the end of the heading line.
Time
—set the amount of time until you reach the end of the
heading line.
•
◦
◦
◦
•
•
◦
◦
◦
World Map
—toggle the world map (basemap) between a basic
world map and a full world map.
The basic world map shows coastal outlines of the world,
with land indicated in yellow.
The full world map shows the coastal outlines of the world
with the land covered in a low-resolution photo image.
Spot Depths
—turn on spot soundings and set a dangerous
depth.
Safety Shading
(with compatible BlueChart g2 Vision cards)—
areas with depths shallower than the specified value are shaded in
blue, while areas with depths greater than the specified value are
shaded in white. The contour is always drawn at, or deeper than,
the selected depth.
Symbols
—customize the symbols that appear on the Navigation
chart.
Navaid Size
—adjust the size of the symbols shown on the
map.
Navaid Type
—set the navaid symbol set:
National Oceanic
and Atmospheric Administration (NOAA) or International
Association of Lighthouse Authorities (IALA).
•
◦
◦
•
•
◦
◦