Measuring Depth And Distance With Vrm - Raymarine E Series Reference Manual

81244_4.book Page 139 Thursday, January 31, 2008 1:53 PM
Chapter 6: The Fishfinder
VRM marker
indicating
distance
behind boat
Depth line
VRM marker
indicating
depth of target
Depth
reading
D10411-1
• 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 sensitivity; 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:
depth reading displayed in at least one window.

Measuring depth and distance with VRM

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.
Note:
SHALLOW SHALLOW Freq1: 200 kHz-Auto Freq1: 200 kHz-Auto
F1: 200 kHz F1: 200 kHz
1768ft
44
46
VRM 1 RANGE
ON OFF 0.787nm
page 143
).
When multiple fishfinder windows are open, we recommend you have the
VRMs set up in Fishfinder are unrelated to those set up in Radar.
Freq2: None Freq2: None
49
63
67
74
74 74
75
DEPTH
44.7ft
Depth
Cursor
(depth indicated target ID
in data bar)
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).
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).
139
42.2ft
70
Depth
markers