Simrad IS20s, middle school
If the Furuno FI-50 family featured yesterday are segmented LED old school—and the color all-in-ones can display data any which way (if the page designers get their butts in gear)—then Simrad’s IS20s are the middle school of N2K instruments. Aside from four analog-look dedicated displays (can’t call stepper motor driven hands responding to N2K smart sensors actual analog, can we?), the IS20 family has the Combi and the Graphic displays shown above, and bigger here . As best I can tell they use the same dot matrix screen, but the Combi is limited to four preprogrammed screens showing only the data sourced below left (“position” is really about SOG). In fact it can be installed as a stand alone—just plug in smart triducer and SimNet power cable—and is similarly simple to use.
But the Graphic offers up to 8 pages of info, each of them highly customizable. Tweakers will love the fact that any data value can be graphed like I’ve set up True Wind Direction above. Come to think of it, the Graphic may be the only display in the bunch that computes True this way in addition to relative to bow (good discussion on this subject over at Jack’s). The Raymarine, Garmin, and Maretron color displays can all do some graphing but not necessarily what you might want. Of the three, for instance, only the Ray ST70 graphs bottom, a view I consider near essential for gunkholers without a fishfinder.
Both these IS20 displays also have quite sophisticated data sourcing abilities. The Combi screen below indicates how you can use Auto select to survey a network and the Graphic screen shows how you can then select specific data types and see all the possible sources, check them out (“i” button) and custom pick what you want. It’s not perfect, though. For instance, I don’t know where Simrad came up with those source abbreviations, and they aren’t easy to decipher. I had to use the “i” screen, which shows a net address, and N2K Analyzer to figure out which GNS (GPS) was the Maretron and which the Lowrance. The GS10 is a Simrad GPS, the ECD the Ray E-120 (which puts out a position PGN, I don’t know why), and the IIS-1 is the ST70 (which doesn’t put out a position, and hence is an Auto select error). If you look at, say, some N2K Analyzer and Lowrance screens, you’ll see that there’s a lot of variability in N2K device naming, but the cynical might accuse Simrad of a “show no competitive brand name” policy. Note, though, that neither Furuno nor Raymarine show any source information at all. The IS20s can also display network traffic stats, and can be set up in up to 7 groups that can be separately controlled (big boat!), even wirelessly. There’s a lot to like about the IS20 family, but I do find myself wondering if Simrad made best use of these big dot matrix screens. Couldn’t the data fonts, like those above, be usefully bolder?