Humminbird 1155C - Manual (Page 57)

Chart Orientation
All the chart views allow you to choose the orientation of the chart. When North-Up orientation is selected,
True North is shown at the top of the display. In other words, objects located to the north of the boat are drawn
above the boat. When Course-Up orientation is selected, the direction of motion of the boat is shown at the
top of the display. In other words, objects ahead of the boat are drawn above the boat. In both orientations,
the view pans automatically, so that the boat is always centered on the display. When the boat is stationary,
it is drawn as a circle. When the boat is in motion, it takes on a boat shape, pointed in the direction of motion
(always Up in the Course-Up orientation). See Navigation Menu Tab: Chart Orientation for more information.
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