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2. RADAR, CHART RADAR OPERATION
2-12
How to measure the range from the trackball module
1. Click the title bar on a VRM box to activate the corresponding VRM.
2. Spin the scrollwheel or use the trackball to align the active variable range marker
with the inner edge of the target of interest and read its distance at the bottom-
right position on the screen. Each VRM remains at the same geographical dis-
tance when you operate the range control. This means that the apparent radius of
the VRM ring changes in proportion to the selected range scale set the outer edge
of the VRM on the inner edge of the target.
3. To anchor the VRM, push the left button.
To turn off a VRM, click the arrow in the applicable VRM box. The VRM disappears
and the VRM box is minimized.
2.9.2 How to set VRM attributes
You can customize the VRMs to suit
your needs.
1. Open the menu then select [3
NAV TOOL] and [2 EBL VRM] (B
type) or [2 EBL/VRM CURSOR]
(IMO and A types) to display the
[EBL/VRM] menu (EBL/VRM/
CURSOR menu for the IMO and
A types).
2. For the B-type radar, select [3
VRM1] or [4 VRM2] as appropri-
ate. Spin the scrollwheel to select
desired unit then push the left
button.
3. Select [6 VRM TTG] (B type) or [2
VRM TTG] (IMO and A types) and then select the VRM(s) that are to show/hide
the TTG indication. [OFF] shows no TTG indication.
4. The [LINK EBL] option for [7 VRM OFFSET] automati-
cally activates the corresponding VRM when the offset
EBL is enabled.
5. Close the menu.
B-type radar
IMO- and A-type radars
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Offset
EBL
VRM