Matsutec HP-528A User Manual page 13

2.3 Plotter
Show the ship, waypoints, routes, tracks, AIS targets in a plotter graph.
2.3.1 Plotter zoom
Zoom scale is available among 0.02 ~ 320 nm.
Press ZOOM key.
Use ▲ or ▼ key to zoom in or zoom out.
Press ENT key to exit.
2.3.2 Center own boat
Normally when own boat is travel off the plotter screen, it will
automatically return back to the center of the screen.
When cursor is shown, it won't center automatically. Pressing ENT key
and hold for more than 2 seconds will center own boat in the screen
again.
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