Getting marine electronics sonar navigation right usually comes down to one question: can a single display handle the jobs you need? The Simrad NSS12 is built to answer that with a 12-inch touchscreen, fishfinder, radar, GPS, and chartplotting in one unit. At $1,199.95 for a used example, the decision comes down to whether that all-in-one setup works for the way you boat.
Quick verdict
The NSS12 makes the most sense for boaters who want a large command center rather than a basic plotter. The display is backed by Active Imaging Sonar and enhanced inland and coastal charts, and the physical keypad gives you useful shortcuts. The used condition is the main caveat, but the overall package is genuinely multifunctional.
Who it suits
This is a strong fit for powerboats and sportfishing center consoles, where you need to track structure, bait, and boat traffic at the same time. A center-console owner can run sonar views while keeping an eye on the chart, and the screen keeps those views readable from the helm. If you only need a simple depth finder, this unit is more than you'll use.
What stands out from the listed details
The interface leans on simple menus and icon-based navigation, while the keypad's one-touch buttons provide shortcuts when you don't want to poke through screens. Radar is included in the same unit, and the enhanced inland and coastal charts keep you covered on lake and saltwater trips.
Meaningful trade-offs
Beyond the used condition, the biggest consideration is space: a screen this size demands dash and wiring room. It also packs far more capability than a basic fishfinder, so you're paying for a full multi-function display even if you only need depth and GPS. Make sure those features align with your trips before committing.
Simrad NSS12 Boat Marine 12" Touchscreen FishFinder Radar GPS MFD Chartplotter

The NSS12 gives you one helm display that can handle navigation, sonar, and chartplotting without adding another screen. The limitation is the unit's used condition, so the $1,199.95 price requires a deliberate look at your tolerance for pre-owned gear.
Bottom line
If you run a powerboat or sportfishing center console and want an all-in-one command center, the NSS12's combination of Active Imaging Sonar and chart coverage is a strong choice. If you're not ready to commit to a large MFD or a used unit, it might be more than you need. For the right boater, this is a capable multi-function display.