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Old 28-07-2016, 15:11   #1
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Navico BR24 plugin Alarm Data


I don't know anything about navigation, but I have to develop some kind of alarm system using the 3G radar.

Making some test with OpenCPN and the Navico BR24 plugin, every time that a alarm occur in the Guard Zone 1, I get a message box with some information:

Zone 1: 1348 <- changing every second
Zone 2: 0

Reading the source code, they call this number variable as bogey_count
Using this number, can I infer if something is inside of the Guard Zone or not?

What type of information this number provide?

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Old 28-07-2016, 23:21   #2
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Location: Orust Sweden
Boat: Najad 34
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Re: Navico BR24 plugin Alarm Data

Correct, bogeys are echos detected inside each guard zone. The number represent the total strange of echos inside a guard zone, big targets - high numbers.
There is a threshold for scanner signal strength when it's called a target. See the config file (opencpn.ini for Windows) for values. ThresholdBlue=50 is the lowest.

I'm not the coder so if you want more details please use the thread OpenCPN SIMRAD/LOWRANCE Radar Overlay PlugIn that used to be watched by Kees and Douwe. That thread also covers the history for the plugin.
The plugin was once started using this paper: at Roboat: Radar where basics of the scanner function can be found.
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alarm, navico, plug

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