Quick verdict
When you're stocking a boat or an electronics bench, the gear has to match the job. The Simrad NSS12 is a complete 12-inch touchscreen chartplotter with radar, Active Imaging Sonar, GPS, and fishfinding all on one helm display. The Navionics GPS Signal Simulator Ver 3.0 is a dedicated unit that generates GPS signals for testing chartplotters and nav instruments. If you're installing a boat, the Simrad NSS12 is the full system. If you're troubleshooting electronics on the workbench, the Navionics simulator is the focused tool.
At a glance
| Feature | Simrad NSS12 | Navionics GPS Signal Simulator Ver 3.0 |
|---|---|---|
| Listed price | $1,199.95 | $299.00 |
| Primary role | 12-inch touchscreen chartplotter / fishfinder / radar / GPS MFD | GPS signal simulator for chartplotter testing |
| Key functions | Enhanced inland and coastal charts, radar, Active Imaging Sonar, touchscreen menus with one-touch keypad | Generates GPS signals to verify chartplotter operation |
| Condition | Used | Used |
Where the Simrad NSS12 wins
If you need one screen at the helm for navigating, fishing, and scanning the water, the NSS12 is built for that. It's designed for powerboats and sportfishing center consoles, with a touchscreen and one-touch keypad so you can jump between chart, radar, and sonar views. The enhanced inland and coastal charts and Active Imaging Sonar make it a true multi-function display.
Where the Navionics GPS Signal Simulator wins
If your goal is to verify that a chartplotter or GPS receiver works before it goes into a boat, the Navionics simulator is made for that. It's a used unit in perfect working condition with a 90-day warranty, and the photos show exactly what you'll get. It concentrates on the signal side of navigation, so you don't have to tie up a full helm screen just to run a bench check.
Product notes
Simrad NSS12 Boat Marine 12" Touchscreen FishFinder Radar GPS MFD Chartplotter
This is the do-it-all helm unit. The 12-inch touchscreen puts enhanced inland and coastal charts, radar, Active Imaging Sonar, and GPS steering data in one place. Simrad's interface relies on simple menus and icons, and the keypad gives you one-touch buttons for the functions you use most. That layout is a real plus when you're driving a sportfishing center console and need to switch between chart, sonar, and radar views quickly. The trade-off is that it's a full display, so if your only job is to bench-test GPS signals, it's far more capability than the task calls for.
Navionics GPS Signal Simulator Ver 3.0 Boat Marine Navigation Chartplotter Testi
This unit earns its place on the bench rather than the helm. It generates GPS signals so you can verify that a chartplotter or navigation system is receiving and processing position data correctly. It's a used unit in perfect working condition with a 90-day warranty, and the photos show exactly what you'll receive. For technicians, installers, or boaters who maintain their own gear, that's useful confidence during a setup or troubleshooting session. The limitation is the flip side of its specialization: it's a signal generator, not a touchscreen chartplotter, so it won't guide you on the water. If you need a display to navigate by, this simulator isn't that tool.
Final choice by use case
- For the installed helm: Choose the Simrad NSS12. It combines chartplotting, fishfinding, radar, and sonar in one 12-inch touchscreen, and the one-touch keypad keeps critical views a tap away.
- For the workbench: Choose the Navionics GPS Signal Simulator. It delivers a GPS signal for testing, comes with a 90-day warranty, and is the lower-priced pick in the comparison above.
