View Poll Results: When using Radar, how often do you use ARPA/MARPA
I never use ARPA/MARPA, or I don't know what it is 12 31.58%
I occationally use ARPA/MARPA 17 44.74%
I use ARPA/MARPA on a regular basis 9 23.68%
Voters: 38. You may not vote on this poll

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Old 11-09-2014, 03:44 PM   #1
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Poll on use of Radar ARPA/MARPA feature

I'm curious how many people, when using their radar, make use of the ARPA/MARPA functions. It allows you to "acquire" and track a target, showing the targets speed and direction. If you have radar, please take the poll.
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Old 11-09-2014, 04:22 PM   #2
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You'd be crazy to have it and not make use of it.
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Old 11-09-2014, 05:01 PM   #3
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I use it.
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Old 11-09-2014, 05:06 PM   #4
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Radar, but no ARPA or MARPA feature.

PS: Didn't want to be considered "crazy".
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Old 11-09-2014, 05:10 PM   #5
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I've found that lots of people don't use it, or even know what it is, hence the poll.
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Old 11-09-2014, 05:10 PM   #6
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My AIS plots on the radar display as well, it is simpler to just click on the AIS target than to use the radar functions.
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Old 11-09-2014, 05:35 PM   #7
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My AIS plots on the radar display as well, it is simpler to just click on the AIS target than to use the radar functions.
No that many targets have AIS. I use ARPA when there are targets out there I am particularly interested in tracking, but not just for the sake of using it. Great tool.
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Old 11-09-2014, 08:47 PM   #8
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Anything with a 3 mile or smaller CPA gets tracked at sea. Whatever you comfort level will determine.
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Old 11-09-2014, 08:55 PM   #9
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My AIS plots on the radar display as well, it is simpler to just click on the AIS target than to use the radar functions.
Thats what I do as well.

Before AIS I never used the feature either, even though it is on my Furuno Radar.

I watch the targets around use the echo trail function to get an idea of the targets course
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Old 11-09-2014, 08:59 PM   #10
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No on the ICW, yes offshore but normally only if it appears to be a concern
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Old 11-09-2014, 11:24 PM   #11
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Our Furuno NavNet VX2 does not have ARPA but it does let you keep manual track of the bearing and range to two targets simultaneously. We have used this feature occasionally when boating in fog.
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Old 11-09-2014, 11:29 PM   #12
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Yes we use it. In the fog to avoid both BC and Washington State ferries, and in good weather to keep in practice.
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Old 11-09-2014, 11:40 PM   #13
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If you don' use it offshore, you probably don't know what you are missing. Note that the A means automaric -- one need only enable.
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Old 11-10-2014, 09:19 PM   #14
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When I upgraded my autopilot I lost the heading and GPS input to the radar (Seatalk) and would need a NMEA2000 to NMEA0183 gateway to get it back. At this point my radar is old and dumb and probably will stay that way.

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Old 11-10-2014, 10:10 PM   #15
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I do, but I don't totally trust it on my new Simrad system yet. I need to test it more...

When operating in fog or at night, I put a VRM/EBL on any target that looks threatening. If the target comes right down the EBL (constant bearing decreasing range, i.e. collision course), I alter course or speed to pass well clear of it.
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Old 11-10-2014, 10:24 PM   #16
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I use MARPA when offshore. Probably wouldn't if I had AIS.
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Old 11-11-2014, 08:45 AM   #17
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I use MARPA to check speed on other boats especially in no wake zones

I have found the speed read out to be very inaccurate even on my new digital radar and heading sensor.
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Old 11-11-2014, 09:43 AM   #18
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We only use arpa in limited viz situations. Mainly at night with the alarm zones set an hour plus out. We also have ais and use it in combo with Marpa when things get boring.


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Old 11-11-2014, 10:22 AM   #19
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AIS (receive only) is enabled by default. Useful information but nuisance warnings when entering a marina. (Do AIS installations require the system to transmit when a boat is docked?). MARPA occasionally, primarlly to answer the question "Geez, how fast is that guy going?"

99% of my boating is day VFR. If I was out at night or in reduced visibility, I would probably use the MARPA function more often.
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Old 11-11-2014, 10:31 AM   #20
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I use MARPA on the Chesapeake Bay to measure the speed of the freighters. They move deceptively fast. When I was on a 7 knot trawler, they could sneak up very fast. Kept just outside the channel.
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