NorthStar 972 Quickstart Manual And Reference Manual page 122

Reference section 7 — Echo sounding
118
Using the MORE key
Changing the advance speed
Advance speed refers to the speed at which
the vertical scan lines move from right to
left across the
Echo Sounder
are five advance speeds (plus the Off
setting, which freezes the advance of all
data):
2/1 - two identical lines of data are
•
displayed for every ping
1/1 - one line of data is displayed for
•
every ping
1/2 - one line of data is displayed for
•
every two pings
1/4 - one line of data is displayed for
•
every four pings
1/8 - one line of data is displayed for
•
every eight pings
For speeds 1/2, 1/4, and 1/8, each
displayed line of data is the average of 2, 4,
or 8 pings, respectively.
To set the advance speed:
1. At the Echo Sounder screen, press
Adv spd
then press .
Adv spd
2. Keep pressing
advance speed.
Return
3. Press to go back to the Echo
Sounder screen.
Displaying the A-scope
The echo sounder's A-scope lets you look
closely at present or past echoes by hori-
screen. There zontally magnifying the echo from each
ping.
To display the A-scope:
1. Press
2. Press
More
,
to select the desired
More
.
AScope
to turn the A-Scope on or off.
A-scope
The A-scope appears on the far right-hand
side of the screen, magnifying one water
column.
Northstar 972