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Chapter 10: Working with radar 81
Changing the displayed range
Each time you click the RANGE button on the Pathfinder panel, the range
changes to the next available setting.
You can also change the range by clicking the range icons in the toolbar.
10.8 Marking a position on-screen
You can mark a position on the radar screen using a waypoint (also known
as a mark) anywhere on the radar screen.
Waypoints are placed with an ‘X’ symbol at either the cursor or boat’s posi-
tion, depending upon your selection. Waypoints are stored with their
latitude, longitude and symbol; and this information is retained when the
radar is turned off.
Waypoints can be placed using the following methods:
• Main menu.
• Pathfinder panel.
• Right- mouse menu.
To place a waypoint using the main menu:
1. Select Waypoints. The drop-down menu is displayed.
2. Click Place waypoint at vessel. A new waypoint will be placed at
the boat’s position on the radar screen.
To place a waypoint using the Pathfinder panel:
1. Click the WAYPT button on the Pathfinder panel. The waypoint soft
key options will appear in the soft key bar.
2. Click the soft key corresponding to where you want to place the
waypoint. A waypoint will be placed in that position.
3. When you have finished, click the BACK button.
To place a waypoint using the right-mouse menu:
1. Right-click the mouse. The right-click menu will appear.
2. Click on the option for where you want to place a waypoint.
10.9 Using radar to help avoid a collision
You can use the following radar functions to help you avoid a collision:
• Range rings.
•VRMs/EBLs.
• Guard zones.
•MARPA.
Range rings
Range rings are concentric circles displayed on-screen and centered from
your boat at pre-set distances. The number of rings shown and their
spacing changes automatically as you change the range.
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82 RayTech RNS V6.0 - Users Guide
Range rings can be used as a basic method of obtaining distance informa-
tion from the radar picture.
Range rings can be turned on or off as required.
To turn range rings on/off, use the right-mouse menu, select
Range Rings
and click. A check mark will appear when they are selected on.
VRMs/EBLs.
A variable range marker (VRM) and its associated electronic bearing line
(EBL) is used to determine the range and bearing (respectively) of objects
detected by the radar.
A standard VRM is displayed as a circle with its center on your boat’s posi-
tion, and its EBL is displayed as a line from the origin, to the edge of the
radar screen. Both are shown as dotted lines. If you range in or out, or
offset the center of the display, the original setting of the VRM/EBL remains
unchanged. RayTech allows two VRMs/EBLs to be displayed at the same
time.
When a VRM/EBL pair is active, their bearing and range can be displayed in
an associated databox. This is displayed by clicking the
VRM/EBL Box
soft
key to ON.
Using VRM/EBLs
To measure the range and/or bearing of a target
or point from your boat’s position, you need to
display a VRM/EBL and edit (move) it on- screen
so that it intersects the desired target or point.
The first VRM/EBL will be placed at a location 1/3 of the current range and
030
0
relative to your boat’s head. If this setting is adjusted, the display will
retain the adjustments and use them when the VRM/EBL is next turned on.
To use a VRM/EBL to tell you how far away a target is and in
what direction it is traveling:
1. Click the
VRM/EBL
soft key. The soft key options for VRM/EBL 1 will
be displayed.
2. Click the
VRM/EBL 1
soft key to ON. The VRM/EBL will be shown on
the radar picture with your boat at its center.
3. Click the
Adjust VRM 1
soft key. The on-screen VRM will change from
a dotted to a solid line.
4. Use the cursor to adjust the VRM to its required size.
5. Click to return the VRM to a dotted line and retain the adjustment.
6. Click the
Adjust EBL 1
soft key. The on-screen EBL will change from a
dotted to a solid line.
7. Use the cursor to place the EBL over the required target.
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EBL
VRM
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