Marine Electronics Forum

Built in sonar vs. black box

Old 10-30-2019, 01:51 PM
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Default Built in sonar vs. black box

What would I be gaining, if anything, by adding a separate black box sounder to a Garmin 8616xsv or Raymarine Axiom Pro 16? I know those two come with included sounders, so I'm trying to understand what benefit you would see by using those?
Old 10-30-2019, 10:53 PM
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I was just talking with a Raymarine guru here in Oz about this. According to him the Axiom Pro internals are as good as the CP470in terms of processing the image. I think power is different though
Old 10-31-2019, 02:22 AM
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The internals in the modules are still that tiny bit better, but you will need a very good transducer and 150+ meters of water under your boat in order to actually see any difference.
Old 10-31-2019, 07:00 AM
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i would stick with the internal unit as it gives you side/downscan capability on certain transducers. The only time you probably want to go external unit is if you need/want the 2kw transducers
Old 10-31-2019, 08:07 AM
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Thanks for the replies! Looks like I would stick with the Axiom Pro with RV220 transducers.
Old 10-31-2019, 08:22 AM
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The theory is by using a separate box for the sonar you are separating sensitive internals from other stray electrical signals (as in a combined unit like the Axiom) and may get slightly better performance. That being said, the one inside my Axiom works just fine for my needs. I didn't feel the need to install, wire, and maintain a separate unit.

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