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1. OPERATIONAL OVERVIEW
1-19
1.16.2 Measuring range by the variable range marker (VRM)
There are two VRMs, No. 1 and No. 2, which appear as dashed rings so that you can discriminate
them from the fixed range rings. The two VRMs can be distinguished from each other by different
lengths of dashes.
1. Press the VRM key to display either of the VRMs. Successively pressing the VRM key toggles
the active VRM between No. 1 and No. 2. The currently active marker is enclosed with >.....<
in the VRM indication box.
2. Operate the Trackball to align the variable range marker with the inner edge of the target of
interest and read its distance at the lower-right corner of the screen. Each VRM remains at the
same geographical distance when you operate the RANGE key. This means that the apparent
radius of the VRM ring changes in proportion to the selected range scale.
3. You may “anchor” the VRM by choosing it and pressing the ENTER key.
4. To erase a VRM, make it active and press the CANCEL/HL OFF key.
Measuring range and bearing between two targets with the EBL
No. 1
VRM
+ 37.4°R 0.007 NM
VRM2 0.140
NM
VRM
indications
VRM1>0.007
NM
<
No. 2
VRM
Target
+