When purchasing my vessel, I had planed to replace the entire system as well. I spent a great deal of time researching the solution and agonizing over my choice. First let's be clear, it is mostly a personal choice, like Chevy vs ford. There are reasons some have for their choice as you have gone through.
The good in my decision was hundreds of lbs of wiring and a antiquated system gone. I really was leaning towards a Garmin based solution. If I was not a technology geek I likely would have gone down that path. My choice was this. A Furuno backup system (Navnet 3d system in my Flybridge. It can control everything needed if we had problems. The core system runs a glass bridge solution using Nobletec running on Mac mini's (more on that later). This choice was two fold, first, I wanted 3 x 21" screens to display my system and while most marine multifunction devices offer big screens or black box solutions with big monitors, the cost were out of hand. I ended up getting high contrast marine displays for $2500 each. Compare that to a Furuno or Garmin equivalent....I wanted to have some flexibility with my system and wanted upgrades to be easy. This offered the most for that. My depth sounder, radar, are all Furuno chirp sounder and HD radar included.
My displays beyond the 3x screens are all iPads with the exception of the touch screen that supports my analog to digital engine monitoring and DC switches. I replaced 25 rocker switches with two of these. The iPad's show NMEA data, video camera, light controls, and sometimes charting info depending on who is on board and what they want to see. Why iPads? Find a better, inexpensive bulletproof ( I validated with my four kids abusing different iPads over the years) solution. I often joke I could do drive my boat from and iPad from home if someone could start it. iPads can run a passive copy of Nobletec as well as a great secondary charting platform called Navionics (<100$). The iPads run liveCamsUs (video solution using DLink wireless cameras and axis wired (PoE) camera. They also run NMEARemote witch displays my engine, weather, environmental data. Best part...these apps are constantly updated. I used remote screen sharing or dedicated apps for the other purposes on the iPads (I have a few on board).
Back to the choice of Nobletec. This gave me the power and flexibility to display what ever I wanted without limited to brand. Such as my video solutions, my web pages for analog to digital gauges, NMEA data software, or surf the Internet from the same platform. Lots of flexibility without limitations with a closed loop system. The choice of Mac mini's was recent. Good thing for flexibility. Best hardware platform already setup for low consumption, solid state drives for a hardened boating system, fanless. Find a better solution for the money. The Only hard part is replacing the OS for windows but that is so common now it was not a big deal.
What does that provide me with? A platform that has both a second station running my charting/sounder/radar solution, that can be used for planning or wardering minds while the primary system chugs on. A system that can do much more, like trying to find the "end" of the Internet. The flexibility for expansion, with iPad apps or wireless HDMI I can share the display with many rooms (read that as anchor alarms and data in master cabin, or ability to see camera displays, charts, and sounder data for bounty hunting for fish, shrimp, crab.). If all else fails (triple redundancy) I can fall back on the Furuno system in the fly bridge).
Again, it is a choice I made, others have there own reasons for their own choices, but this was mine. If I was not so savvy or had a deep internal desire for new tech, and was ok with the boxing in of a closed platform I think I would have went with a Garmin solution (for their function to value over Furuno).
What other benefit? Well I can sit here and view my boat (via the 5 cameras) from my iPhone, i get monitor motion sound for security, I can turn on or off most things remotely including heat, I can check NMEA data, all from any location. This with a mostly integrated system. The exception is the Nest heat control, you use and app to control but not so integrated to the other systems. These thing became limited or product bounded with a closed looped system.
The biggest trade off, if you don't know how to fix it, you got problems. But then again if your Furuno or Garmin system breaks who knows how to repair that? There are a lot more windows experts that Garmin experts.
This was a huge investment and I likely would do a few things over but I never tire of the access or flexibility of the solution. Including the computer upgrade I made recently to the Mac mini's. More power, more redundantly (two macs vs one ship PC), less space, reasonable cost.
This was all done, including the tear out of wiring for less than most electronic packages for most boats of my size when ordered new.
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