Thanks GW & A, very useful.
GW. Watching your Sailproof posts with great interest, as I think this is a similar direction to which I will take.
Looking out for deals on the run-out 10", as I can't see that I need greater processing power on my sort of boat/applications?
meanwhile...
I like my cheap London chartplotters ruggedised Samsung tab, with UKHO charts (at <£200, this is as cheap as a phone really, and it doesn't really matter if I break/loose it?). I see the Sailproof as a super-duper ££ version of this? Handy to view/use at helm, which Raymar plotter built into cabin bulkhead most certainly is not. Also that location perhaps a bit vulnerable to weather and winch handles (I have 4 winches) for a £1500 replacement?
My plotter (Raymarine) and Wireless wind (Nexus/Garmin) are both now dead and obsolete (from 2012 I believe). As a stop-gap, I've installed a Raymarine i40 Bidata display, to give speed and depth...only to find that the speed/temp transducer has also died. grrrr!
Got a new retractable speed/T sensor for £150. 200kHz.
Looks like the new Tri data sensors (Speed+Depth+Temp) run at 250kHz - a "silo within a silo"? so will need ANOTHER sensor if modernising to B&G Triton?
I'm thinking Sailproof tab for Nav & AIS display, plus perhaps B & G Triton2 for Depth/speed/wind sail info?
Andy might know if the B&G stuff plus a multiplexer, and AIS engine of some sort would work together to give me what i hope for?
It would be ideal to be able to screen mirror the sail data on the tablet.
I'm not convinced that I need an AIS transponder, at least not hereabouts...yet...but may well bite the bullet and buy an AIS transceiver for "a few" £ more?