Raymarine a50 User Guide

The fishfinder display gives you various methods of measuring 
depth and distance:

•

Depth reading - your current depth. The size and position of this 
readout can be changed in the Fishfinder display Setup menu 
(see 

).

•

Depth lines - horizontal dashed lines drawn at regular intervals 
to indicate the depth from the surface. These are switched on/off 
in the Fishfinder Display Setup menu (see 

•

Depth Target ID - depths noted against recognized targets. The 
sensitivity of these IDs is directly linked to the Fish Alarm sensi-
tivity; the greater the fish alarm sensitivity, the greater the 
number of labelled returns. These targets are switched on/off in 
the Fishfinder Display Setup menu (see 

•

Cursor depth - the depth and the distance from your boat 

marked by the cursor, is indicated in the data bar at the top of 
the screen. This performs in a similar way to a VRM, but without 
lines.

•

VRMs - to indicate the distance behind your boat and the depth 
below of selected objects.

Note: When multiple fishfinder windows are open, we recommend 

you have the depth reading displayed in at least one window.

You can use a Variable Range Marker (VRM) to determine the depth 
and distance-behind-boat of an object. These markers consist of a 
horizontal (depth) line and a vertical (distance-behind-boat) line; 
each of which are marked with the appropriate measurement and 
are controlled individually.

VRM marker
indicating
depth of target

Depth
reading

Depth line

Depth
markers

Depth
target ID

Cursor
(depth indicated
in data bar)

VRM marker
indicating
distance
behind boat

81314-1_A Series Reference Guide.book  Page 81  Thursday, August 28, 2008  9:23 AM