GPSMAP 640 Owner’s Manual 19
Marine Mode: Navigating
When the pointer icon is on the location you want to navigate
to, or you have selected a destination using Where To?, touch
Navigate To > Guide To.
CAUTION: The Automatic Guidance feature of the BlueChart g2
Vision SD card is based on electronic chart information. Carefully
compare the course to all visual sightings, and avoid any land,
shallow water, or other obstacles that may be in your path.
Following an Automatic Course (Guide To) on the
Navigation Chart, the Perspective 3D Screen, or
the Mariner’s Eye 3D Screen
After you create an automatic course using Guide To, a magenta
line appears. The magenta line represents the suggested passage
between the start point and the end point, and does not move, even
when you are off course.
1. After you set an automatic course using Guide To, from the
Home screen, touch Charts and then touch Navigation Chart,
Perspective 3D, or Mariner’s Eye 3D.
2. Follow the magenta line from the start point to the end point.
3. Steer off course to avoid land, shallow water, and other
obstacles on the water.
4. When you are off course, steer back to the magenta line when
the path is clear.
NOTE: When following a course, important navigation
information appears in a data bar along the top of the chart. To
adjust the settings of the data bar, see page 40.
