When you're planning a marine electronics sonar navigation setup, the first question is about the job you need done. Do you want a display mounted on the boat to show routes and chart details, or do you need a signal source to check a chartplotter's GPS response? The Garmin GPSMAP 1222 and the Navionics GPS Signal Simulator Ver 3.0 take two very different paths in that same category. Both are used pieces of marine navigation gear, but they solve different problems. Here's how to line up your choice with your actual workflow.
Quick verdict: Choose the Garmin GPSMAP 1222 if you need a working onboard navigation display. It's a chartplotter display with chart plotting features, priced at $1,300. Choose the Navionics GPS Signal Simulator Ver 3.0 if you need a GPS signal source for testing chartplotter navigation equipment. It's priced at $299 and covered by a 90-day warranty.
At a glance:
| Product | Price | What it does | Price bar |
|---|---|---|---|
| Garmin GPSMAP 1222 12-inch Marine Chartplotter GPS Navigation Fishfinder Display | USD 1,300.00 | 12-inch chartplotter display with internal GPS/GLONASS | |
| Navionics GPS Signal Simulator Ver 3.0 Boat Marine Navigation Chartplotter Testi | USD 299.00 | Signal simulator for chartplotter GPS testing |
Where the Garmin wins: The Garmin GPSMAP 1222 is the one that functions as a chartplotter display. Its sunlight-readable screen is built for onboard navigation, and it includes an internal GPS and GLONASS receiver. Keypad controls and network capability for compatible Garmin marine systems make it a practical choice for a fishing boat or offshore vessel.
Where the Navionics wins: The Navionics GPS Signal Simulator wins for bench-focused GPS testing. Its Ver 3.0 role is to simulate GPS signals for chartplotter navigation gear, which is exactly what you need when checking signal handling.
Garmin GPSMAP 1222
The Garmin GPSMAP 1222 is the choice when a navigation display has to live on the boat. Its 12-inch screen gives you room to see chart details, and the chart plotting feature makes route work straightforward. The unit is network capable for compatible Garmin marine systems, so it can fit into a larger electronics layout. On the used market, this unit shows normal cosmetic wear from previous use, and the 1-year manufacturer warranty still applies. The limitation to keep in mind is that this is a display-first navigation product, not a signal simulator. If your project is testing GPS signal paths rather than running a boat, you'd be paying for screen and controls you don't need.
Navionics GPS Signal Simulator Ver 3.0
The Navionics GPS Signal Simulator is the dedicated tool for simulating GPS signals in a marine navigation chartplotter environment. Its Ver 3.0 role makes it a straightforward match for testing and verifying chartplotter GPS response from the bench. The unit is in perfect working condition and covered by a 90-day warranty. The limitation is scope: it's a simulator, not a chartplotter display, so it won't serve as your onboard navigation screen. If your goal is to put a display on the boat and navigate with it, the simulator won't replace the Garmin. If you need a controllable signal source for bench testing, this is the specialized tool.
Final choice by use case:
- Onboard navigation: Garmin GPSMAP 1222. Use it as the display that shows routes and chart details while you're on the water.
- Bench testing: Navionics GPS Signal Simulator Ver 3.0. Use it to feed GPS signals to a chartplotter for testing the navigation system's signal handling.
