Radar OVERLAY
Radar Overlay Overview
- This function is included in MaxSea depending on your own software version. Before using it, the hardware installation has to be done.
Radar Solutions are an optional add-on to MaxSea which allow users to interface Radar Antenna to the software.
MaxSea can display in real time, radar overlay image at any scale on the cartography. It can display as well, targets coming from NavNet Radar or other FURUNO Radar using network for transferring in MaxSea.
Each radar is a little different but the basics are the same for each radar.
There are three steps required:
1.Connect your system unit to an Ethernet network for transmitting data information to MaxSea. Go to the related chapter to read more on "Installation & Configuration" of Radar equipment.
2.Set up Transmitting data information in your MaxSea software from reading related topics : "Setting Up Data Source Input" and "Setting Up Radar System".
3.The next step is getting started with Radar Overlay in MaxSea.
When First running MaxSea the Radar overlay button is turning on by default and the Radar palette settings appears in the chart toolbar.
If the Radar is power off, "No Radar Source" warning will appear on the chart.
You will learn in this section :
1.Setting up NavNet Radar Overlay in MaxSea
2.Setting Up FURUNO Radar Overlay in MaxSea
3.Using MaxSea with Radar Image Overlay on Chart
See Also Related Topics:
1.How to connect NavNet Radar system
2.How to connect and configure Furuno Radar System.
3.Setting up Radar parameters under "Option: Radar..." dialog.
Setting Up NavNet Radar Overlay in MaxSea
Setting Up NavNet Radar Overlay in MaxSea
- Following documentation is dedicated to MaxSea working with NavNet System unit connected.
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MaxSea Operator Manual version 12.6
To display NavNet Radar Overlay on the chart :
•Click the "Radar Overlay" information button in the chart toolbar to toggle Radar display on/off
•When Radar Overlay is on, NavNet Radar toolbar appears in the Chart toolbar. See also related topic to use NavNet Radar Palette.
•This tool also allows you to display available Radar options :
1.Choose Trails to display moving historic (second trace echo).
2.Choose Rings to display them on the chart.
If the Radar unit is turned on and is properly connected to the computer. The Radar image provides on the opened chart is automatically displayed in the radar operating area.
You will learn in this section how to adjust Radar Overlay with MaxSea. Choose [Option: Radar...] from the [Utilities] menu to call up the dialog box in which you can:
1.Adjust the NavNet Radar Gain
2.Adjust the NavNet Radar Display
3.Adjust the NavNet Radar Signal Processing
4.Adjust the NavNet Radar ARPA Display
NavNet Radar Toolbar
To call up the "Radar" palette go to the [Display] menu and select [Radar].
The NavNet Radar control palette includes all settings for choosing the best display according to sea and working conditions.
Settings |
User Interface |
Range |
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Stdby/Tx
Standby
MaxSea Operator Manual version 12.6
Slide 0 - 100
AC Rain
Note: the intensity of the color displayed varies according to the echo power.
See also related topics for :
1.Setting up Radar Gain: Interactive functions
2.Setting up Radar Overlay Display: only for MaxSea display
3.Setting up Radar Signal Processing: Interactive functions
4.Setting up Radar ARPA : Interactive functions
NavNet Radar Gain Settings
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GAI |
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Option |
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Range |
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Operation |
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Gain |
- manual, |
To adjusts the gain sensitivity of the radar receiver: |
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Auto/Manua |
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- Rough, |
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Click on the Gain Status line to display the Pop-up menu |
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Choose Low, Medium, or High as appropriate Gain Status Automatic or |
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Moderate |
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Manual to adjust it manually. |
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- Calm |
3. |
Press [ENTER] to validate. |
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The proper setting is such that the background noise is just visible on the |
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screen. If your gain setting is too low, weak echoes may be missed. On the |
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other hand,excessive gain yields too much background noise; strong targets |
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may be missed because of the poor contrast between desired echoes and |
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the background noise on the display. |
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Gain Level |
% 0-100 |
To adjust the Gain value when working with Manual Gain Status: |
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Click on the Gain line to display the Pop-up menu |
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Adjust the range from 0 to 100% using arrows or modify it directly by |
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entering the desired percentage value |
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3. |
Press [ENTER] to validate. |
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AC Sea |
- manual, |
To adjusts the AC Sea Status of the radar receiver: |
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Auto/Manua |
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- Rough, |
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Click on the AC Sea Status line to display the Pop-up menu |
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Choose a range according to the sea state ROUGH, RATE,CALM, as |
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Moderate |
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appropriate or manual MODE to adjust it manually |
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3. |
Press [ENTER] to validate. |
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- Calm |
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More info... |
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Radar OVERLAY
Sea clutter at screen center
A/C Sea adjusted; sea clutter suppressed
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Echoes from waves can be troublesome, covering the central part of the |
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display with random signals known as sea clutter. The higher the waves and |
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the higher the antenna above the water, the further the clutter will extend. |
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Sea clutter may affect radar performance because real targets are |
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sometimes hidden by the echoes of small waves. When sea clutter masks |
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the picture, adjust the A/C SEA to reduce the clutter. |
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The A/C SEA reduces the amplification of echoes at short ranges (where |
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clutter is the greatest) and progressively increases amplification as the |
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range increases, so amplification will be normal at those ranges where there |
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is no sea clutter. |
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AC Sea |
% 0-100 |
For manual AC Sea status, to Adjust the AC Sea Gain value : |
Level |
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1. |
Click on the Gain line to display the Pop-up menu |
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2. Adjust the range from 0 to 100% using arrows or modify it directly by |
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entering the desired percentage value |
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3. |
Press [ENTER] to validate. |
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Note:Do not overadjust weak echoes may be missed. |
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A/C SEA should be adjusted so that the clutter is broken up into small dots, |
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and small targets become distinguishable. |
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AC Auto |
On - Off |
Sea clutter and rain clutter can be automatically rejected. |
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1. |
Check the box to start the automatic reject. |
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2. |
Press [ENTER] to validate. |
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Note:When turned on, it overrides A/C SEA and A/C RAIN settings. |
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AC Rain |
% 0-100 |
To adjust the AC Rain Gain value : |
level |
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Click on the AC Rain line to display the Pop-up menu |
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2. Adjust the range from 0 to 100% using arrows or modify it directly by |
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entering the desired percentage valueReducing Precipitation Clutter |
The vertical beamwidth of the antenna is designed to see surface targets even when the ship is rolling. However, by this design the unit will also detect precipitation clutter (rain, snow, hail, etc.) in the same manner as normal targets. Precipitation clutter shows as random dots on the screen.
Adjusting the A/C RAIN
When echoes from precipitation mask solid targets, adjust the A/C RAIN to split up these unwanted echoes into a speckled pattern, making recognition of solid targets easier.
MaxSea Operator Manual version 12.6
NavNet Radar Display Settings
Display settings allows to adjust Radar Overlay image configuration. Display settings information is not interactive with other NavNet equipment connected on the network.
Display |
Option |
Range |
Operation |
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Echo Color |
- GREEN (default) |
To modify echo color. |
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- Yellow, |
1. |
Click on the Echo color line to |
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- Red, |
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display the Pop-up menu |
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- Multi-Color |
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Choose Red, Yellow, Green or Multi- |
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color as desired |
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Note:Multi-color shows echoes in red, |
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yellow or green in order of descending |
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strength |
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Animated Echo Sweep |
On - Off |
1. |
Check the Box to start the |
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Radar Scan in real time |
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2. |
Press [ENTER] to validate. |
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Trail Color |
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To modify Trail color. |
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1. |
Click on the Trail Color line |
to |
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display the Pop-up menu |
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-GREEN (default) |
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Choose Red, Yellow, Green |
as |
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desired |
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- Yellow |
3. |
Press [ENTER] to validate. |
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- Red |
Echo trails are simulated afterglow of |
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target echoes that represent their |
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movements relative or true to own ship. |
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This function is useful for alerting you |
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past possible collision situations. |
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Trail Time |
Value in second |
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To define duration of trail track, in second:
1. Click on the Trail Time line to display the Pop-up menu
2. Enter duration value in second
3. Press [ENTER] to validate.
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Notes : |
384 |
display --d--h--s |
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If (Trail Time = 0 sec), NavNet Radar |
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will turn OFF. |
Radar OVERLAY
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invalid values are not transmitted to |
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NavNet. |
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If (Trail Time > 15 sec), NavNet Radar |
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will receive all duration values which are |
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superior to 15 sec. |
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Radar / Chart Offset Direction |
0-360 |
To define the Chart offset heading: |
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1. |
Click on the Radar / Chart Offset |
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Heading line to display the Pop-up |
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menu |
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2. |
Enter the desired heading offset |
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from 0 to 360 using arrows or modify |
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it directly by entering the desired |
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heading correction value |
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3. |
Press [ENTER] to validate. |
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In some instances position may be off by |
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a few seconds. For example, the position |
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of the ship is shown to be at sea while it |
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is in fact moored at a pier. You can |
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compensate for this error by offsetting |
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chart position |
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Radar / Chart Offset Distance |
0-100 |
To define the Chart offset Distance: |
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Click on the Radar / Chart Offset |
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Distance line to display the Pop-up |
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menu |
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2. |
Enter the desired distance offset |
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from 0 to 100 using arrows or modify |
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it directly by entering the desired |
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distance correction value |
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3. |
Press [ENTER] to validate. |
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NavNet Radar Signal Processing Settings
SIGNAL |
Option |
Range |
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Operation |
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PROCESSING |
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Echo Stretch |
- Off |
To set the Echo Stretch type: |
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- Low |
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Click on the Echo stretch line to display the Pop-up menu |
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- High. |
2. |
Choose HIGH, LOW as appropriate or OFF for no Echo Stretch |
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3. |
Press [ENTER] to validate. |
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Normally, the reflected echoes from long range targets appear on the display as |
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weaker and smaller blips even though they are compensated by the radars internal |
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circuitry. The echo stretch function magnifies these small blips in all ranges. Two |
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types of echo stretch are available: LOW which stretches echoes in bearing direction |
MaxSea Operator Manual version 12.6
and HIGH which stretches them in both range and bearing directions.
This function magnifies not only targets but also sea clutter and radar interference. For this reason, be sure sea clutter and radar interference are properly suppressed before activating the echo stretch.
More info...
Echo Stretch OFF
Low Echo stretch
High Echo Stretch
Interference |
- Off |
To set the Rejecting Radar Interference level: |
Reject |
- Low |
1. |
Click on the Interference Reject line to display the Pop-up menu |
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- Medium |
2. |
Choose Low, Medium, High as appropriate or OFF for no Reject. |
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- High |
3. |
Press [ENTER] to validate. |
Radar interference may occur when near another shipborne radar that is operating in the same frequency band as your radar. Its on-screen appearance looks like many bright dots either scattered at random or in the form of dotted lines extending from the center to the edge of the display. Interference effects are distinguishable from normal echoes because they do not appear in the same place on successive rotations of the scanner.
Be sure to turn off the interference rejector when no interference exists weak targets
MaxSea Operator Manual version 12.6
In certain situations, echoes from very distance targets may appear as false echoes (second-trace echoes) on the screen. This occurs when the return echo is received one transmission cycle later, or after a next radar pulse has been transmitted.
Stby / Tx |
Standby - |
To choose the Radar receiver transmission mode: |
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Transmit |
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1. |
Click on the Stdby/Tx line to display the Pop-up menu |
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2. |
Choose transmission status Standby or transmit |
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3. |
Press [ENTER] to validate. |
NavNet Radar ARPA Settings
ARPA |
Option |
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Range |
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Operation |
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Auto Acquisition |
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1. |
Check the Box to activate Auto |
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Acquisition. |
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2. |
Press [ENTER] to validate. |
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The ARP can acquire up to ten targets |
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ON - OFF |
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automatically by setting an automatic acquisition |
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area. When automatic acquisition is selected |
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after acquiring targets manually, only the |
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remaining capacity for targets may be |
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automatically acquired. For example, if seven |
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targets have been manually acquired, three |
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targets may be automatically acquired after |
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switching to automatic acquisition. |
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CPA Alarm Range |
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OFF, |
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To set the CPA alarm range: |
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0.5nm, |
1. Click on the CPA line to display the Pop-up |
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1nm, |
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menu |
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2. Choose a CPA limit desired from 0.5 nm, 1 |
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2nm, |
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nm, 2 nm, 3 nm, 5 nm and 6 nm. |
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3nm, |
3. Press [ENTER] to validate. |
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5nm, |
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6nm |
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Note Unit (nm) = miles |
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TCPA Alarm Limit |
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OFF |
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To set the TCPA alarm range: |
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30 seconds |
1. Click on the TCPA line to display the Pop- |
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1 minute |
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up menu |
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2. Choose a TCPA limit from 30 sec, 1 min, 2 |
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2 minutes |
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min, 3 min, 4 min, 5 min, 6 min and 12 min. |
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3 minutes |
3. Press [ENTER] to validate. |
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4 minutes |
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5 minutes |
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Note Unit (min) = minutes |
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