Vexilar LC-507 - Manual (Page 16)

16
ADJUSTING THE SWEEP SPEED
Sweep speed is how fast the display moves across the screen.
Generally, you want the Sweep speed to, roughly, match the speed
of your boat. Press the down arrow to move you down to the Sweep
item. Press the left or right arrows to change the setting. There are
six different Sweep speeds, ranging from SLOW to FAST, and
SUPERFAST. This highest sweep speed setting allows you to see
depth and structure changes while the boat is moving at a high rate
of speed.
A-RNG-MODE
This mode determines how the Automatic Range Control works.
There are three settings to choose from. 1ST, 2ND, and 3RD. The 1ST
setting tells the Automatic Range Control to make sure that the first
echo, the bottom, remains in view at all times. 2ND insures that the
range will be adjusted so that the second echo of the bottom can
appear on the screen. Finally, 3RD allows the third echo of the bot-
tom to be displayed.
A-RNG-MODE does not insure that the second and third echoes
will be visible, only that the range will be adjusted so that they can
fit on the screen if the sonar sees them. The type of bottom and the
Gain level will determine if the echoes appear.
To change the A-RNG-MODE setting, press the Down arrow but-
ton to move down to the item. Then, press the Left or Right arrow
buttons to change the setting.
A-GAIN-LEVEL
This item works with the Automatic Gain Control feature. There
are five levels. The Automatic Gain Control, if selected, will adjust
the level of gain according to the conditions. A-GAIN-LEVEL sim-
ply tells Auto Gain to keep the gain on the low side, in the middle,
or on the high side of automatic gain level.
To change the A-GAIN-LEVEL setting, press the Down arrow
button to move down to the item. Then, press the Left or Right arrow
buttons to change the setting.