Lowrance electronic M56 - Manual (Page 127)

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Another option is course-up mode, which keeps the map at the same
orientation as the initial bearing to the waypoint. When either the
track-up or course-up mode is on, an "N" shows on the map screen to
help you see which direction is north.
To change map orientation: from the Map Page, press MENU |
↓ to
M AP
O RIENTATION
| ENT . Use
↑ or ↓ to select the desired mode, then press
ENT .
Press EXIT | EXIT to return to the page display.
Map Menu, left; Map Orientation menu with
the North Up map orientation option selected, right.
Overlay Data
The Sonar Page and the Map Page can be customized to show many
different types of navigation information as text that "floats" on top of
the screen. This is called overlay data and is controlled by the Overlay
Data command.
Sonar Page with Overlay Data turned on. This example shows Depth,
Water Temp. and the Distance to the next waypoint in the current route.
Distance to
destination
Water
temp.
Depth