Check out this chart plotter. It's been getting good reviews
GO7 XSE TotalScan 7" Multi-Touch Chartplotter with Built-In Sonar, wi-fi, charts & GPS for £400. It's essentially a big waterproof navigation tablet.
You can easily connect it to your engine for built in engine monitoring gauges. Pretty much anything is accessible through it that has NMEA 2000 network. You can send data to your smart phone and tablet via wifi if that floats your boat.
It can kill many birds with one stone and help save on the very precious and limited space on a center console. There's lots of other excellent chartplotters to choose from but nothing I've seen new at prices this low., it's usually around the 1,000 mark or just below. I recommend checking this one out.
They do a have a smaller 5" version but I'm aware of its features and price.
Contact member "Wellhouse" Chartplotter
to get the good price from the dealer, 400 pounds delivered.