NorthStar Navigation NorthStar 491 Setting the upper and lower marker depths, Fish alarm window

Setting the alarm’s echo strength level

Setting the upper and lower marker depths

4.Follow the instructions below for each of these five settings.

Fish alarm window

To set the fish alarm’s minimum echo-strength level:

1.At the FISH ALARM window, press SET ALARM LEVEL.

2.Press the CURSOR PAD up and down to set the echo strength level from 1 to 15, as represented on the vertical color bar.

Echoes received that are strong enough to be within the crosshatched area on the vertical bar will cause an alarm (weaker echoes will be ignored).

The fish alarm will sound only when there are echoes inside (or optionally, outside) the upper and lower markers. These markers are displayed on the ECHO screens.

To set the depth of the upper marker:

1.At the FISH ALARM window, press SET UPPER MKR.

The upper marker window is highlighted in black.

491 Echo Sounder Operations Manual Page 57