Quote:
Originally Posted by dave777
MFD's are "just" rugged computers with much higher markup for the niche market.
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I have never heard another sailor say "be sure to back up your MFD in case you have to reload Windows/Linux/iOS/Android/OS X/etc." But I hear it all the time from people with netbooks and PCs at the nav station. I'm guessing no one has to update their antivirus on their MFD every weekend either.
There are high end systems for glass cockpits that are PC and
network based. But the typical mid to low market MFD is based on an embedded processor with no hard drive and dedicated
hardware, firmware and software. They have
water tight enclosures with conformal coated electronics to survive the harsh corrosive
environment. They do not run Windows but might be some flavor of
Linux under the covers as this is quite common in embedded systems design. They typically have an Ethernet port as well as CANBUS, multiple
serial ports, video inputs/outputs and proprietary bus
ports such as
SeaTalk. Putting all these interfaces on a PC or netbook will quickly drive the cost well over $500.
Quote:
Originally Posted by dave777
MFD's go obsolete just as fast, sometime faster because some vendors (watch me not mention Raymarine) just abandon products when it suits them.
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My Raymarine experience is that the 20 year old unit talks just fine with my new one over
SeaTalk. Raymarine still supports the 20 year old unit with
service and tech support. My new MFD will control my 15 year old
autopilot. I'm not sure what product Raymarine abandoned but it wasn't any of what I have.
Raymarine had/has a huge market share. Therefore, there are obviously users that had problems with equipment and for whatever reason did not think the
service was good enough. That happens when you have 90% of the market even if only 0.001% of your customers have issues. But my direct experience with Raymarine is that they make a quality product have good service and their newer units are cutting edge while the recreational marine market is much smaller today that it was 10-15 years ago. The same can be said for
Garmin and the brands by
Navico that are still in production.
Quote:
Originally Posted by dave777
We are having quite a bit of thread drift, because I'm the OP and I'm looking to buy a MFD, looking for recs on those which can share their data.
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So far as I know there is no MFD on the market meeting your requirements. All the posters so far have said the same thing. I further postulated that it was unlikely to ever come to market. I considered that responsive to the original post but I apologize if it wasn't.
The closest out there today are MFDs that can send their screens or some form of graphic replication to an iPad application. Raymarine offers MFDs that do this as do some other manufacturers. But none of them support writing your own display code via a documented API to the transducers. Neither do they offer any API for querying the status of the transducers via the MFD. The MFDs that use Ethernet for radar do not expose that interface to the user. There is a group over on
OpenCPN section that are hacking one type of radar but it is slow going. Have you gone over there and asked the same question?
Quote:
Originally Posted by dave777
So we have opposite conclusions on the lifecycle costs because there is no pair of depreciation/support curves that will make a $2 to $5 thousand MFD look cheaper than a $0 to $5 hundred new nettop or used laptop. Old PCs, especially when running something like Linux, have much more power than needed for NAV tasks, and likely have more power than many big dollar MFD.
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I agree about the computing power required. However, there are very few old PCs at sea. They don't last in that
environment and they cannot be repaired economically. A quality MFD should last for at least 20 years. I suspect no netbook will last even 3 years at sea assuming it doesn't get dropped into the drink before that.
Quote:
Originally Posted by dave777
Are you buying two MFDs? One for the helm and one for the Nav station, and maybe a third for the home office?
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No, I bought one MFD for the helm for a lot less than $1,500. I still have the old one at the nav station which works quite well. I also have a PC at the nav station that can interface with everything on the
boat (except radar) via
NMEA 0183. I do
route planning on the PC or iPad then upload the
route to the MFD.