Humminbird 500 SERIES 580 - Manual (Page 52)

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Chart Speed
Chart Speed determines the speed at which the
sonar information moves across the display, and consequently the amount of
detail shown. A faster speed shows more information in the Sonar Views and
is preferred by most anglers; however, the sonar information moves across the
display quickly. A slower speed keeps the information on the display longer, but
the bottom and fish details become compressed and may be difficult to
interpret. Regardless of the Chart Speed setting, the RTS® Window will update
at the maximum rate possible for the depth conditions. Adjust Chart Speed to
your personal preference.
To adjust the Chart Speed:
1. Highlight Chart Speed on the Sonar X-Press™ menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to increase or
decrease the Chart Speed setting. (1-9, Ultra, where 1 = Slow, 9 = Fast,
Ultra = Fastest, Default = 5)