Raymarine E7D, excellent unit, not too large a screen, perfect size for a rib have seen some ribs with large plotters which looks like someone has a telly onboard ha ha, anyway this particular raymarine is a highbrid as in touch sensitive screen but also has buttons which are very useful when wearing gloves or in bad weather. You can customise display well and have a number of boxes on the top of the screen to diaplay the most important things like depth, speed, position, heading etc while leaving plenty of screen room for the chart display.
My advice would be to perhaps visit the southampton boat show or similar and have a decent look round all the navionics stands and try a few out in simulation mode etc.
Alos consider connectability with other devices NMEA 0183, NMEA 2000 or propriatory, plus future considerations as in can you add AIS, RADAR, ENGINE INFO ETC.
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