I had a Simrad
plotter/sounder, Standard Horizon GPS
antenna/receiver, TackTic sailing instruments, Raymarine autopilot
with hardwired remote
control/display, ACR AIS
transponder, and a Vesper marine
ais display. It all worked beautifully together. Amazingly enough, thanks to NMEA
The problem with a mix n match system is that when you have a tech issue/question/problem, none of these companies will admit the existence of any of the others. Nor will they even consider the possibility that some idiot would ever think to connect their stuff to anybody else's obviously inferior gear
. Obviously, the problem is that OTHER company's thingamajig. If you have a good local dealer/installer, they can act as your equipment interface. If you're going it on your own, then you have to work it out.
That is a good reason to buy a single
company system. In addition, here in the US, anyway, deep discounts can be had on complete packages. Especially at the big boat shows. Which may be an advantage to replacing it all at once.
A big consideration is will all the new stuff work with your existing transducers?
And if you go all new, you will also be replacing all the wire and connectors, another source of sudden or intermittent failures.
So bottom line, it's all about the money
. best way to go; all new everything installed and calibrated by a pro. Cheapest thing to do? get the stuff you have working and use it for a while.
Just because it's "obsolete" doesn't necessarily mean it doesn't work any more. Check or just replace all your connectors, familiarize yourself with the stuff you have. Maybe replace your dead equipment with good used pieces for cheap
. Then when you decide to up grade you'll have experience operating the stuff you have. And you may be able to sell your whole system to someone else.
You can spend a lotta dough on gizmos you don't really need.