Quick Take
Choosing marine electronics sonar navigation gear usually comes down to how much screen, which control style, and what functions you need at the helm. The four units here span listed prices from USD 299.00 to USD 1,300.00. There is a GPS signal simulator with a 90-day warranty, a 12-inch touchscreen Simrad MFD with fishfinder and radar features, a Garmin GPS MAP 8008 with Volvo Penta branding, and a Garmin GPSMAP 1222 with a 12-inch keypad-controlled display. The price spread covers roughly USD 1,001 between the lowest and highest listed prices, so your choice depends on whether you need a full navigation display or a testing/simulation tool.
Listed Price Comparison
| Product | Listed Price | Price Bar | What stands out |
|---|---|---|---|
| Navionics GPS Signal Simulator Ver 3.0 | USD 299.00 | GPS signal simulator; 90-day warranty | |
| Simrad NSS12 12-inch Touchscreen MFD | USD 1,199.95 | Touchscreen chartplotter with fishfinder, radar, and GPS | |
| Garmin GPS MAP 8008 Volvo Penta | USD 699.95 | Touchscreen chartplotter with Volvo Penta branding | |
| Garmin GPSMAP 1222 12-inch Chartplotter | USD 1,300.00 | Keypad controls; internal GPS and GLONASS |
Decision Matrix
| Use case | Recommended unit | Why it fits |
|---|---|---|
| Simulating GPS signals or testing a chartplotter | Navionics GPS Signal Simulator Ver 3.0 | Lowest listed price at USD 299.00 and a 90-day warranty |
| Wanting a touchscreen MFD with multiple marine functions | Simrad NSS12 | 12-inch touchscreen with chartplotting, fishfinding, radar, and GPS functions |
| Building a helm around Volvo Penta components | Garmin GPS MAP 8008 | Volvo Penta appears in the title; listed at USD 699.95 |
| Preferring keypad controls on a large display | Garmin GPSMAP 1222 | 12-inch display with keypad controls and internal GPS/GLONASS |
Product Notes
Navionics GPS Signal Simulator Ver 3.0
If your goal is to test a chartplotter, this unit is the only one in the group whose title explicitly positions it as a GPS signal simulator. The listed price of USD 299.00 is the lowest of the four, and the listing includes a 90-day warranty. The unit is marked as used and comes from Spain, with the manufacturer part number listed as "GPS simulator." That makes its role clear: it produces GPS signals for testing rather than acting as a full navigation display. The limitation is that you won't get a screen, chartplotting interface, fishfinder, or radar from this device. If you need a display at the helm, you will still need a separate chartplotter or MFD.
Simrad NSS12 12-inch Touchscreen MFD
At USD 1,199.95, the Simrad NSS12 gives you a 12-inch touchscreen with a control layout that includes both touch input and one-touch keypad buttons. The unit covers chartplotting, fishfinding, radar, and GPS functions, with enhanced inland and coastal charts. It is listed as used, so the screen condition is something to keep in mind, but the function set is broad. The main limitation is the listed price: it is higher than the Garmin GPS MAP 8008 at USD 699.95, so if you already have a fishfinder or radar installed separately, this MFD may duplicate functions you do not need. If you want a touchscreen MFD that consolidates multiple marine electronics tasks, this is the one to compare against the Garmin GPSMAP 1222.
Garmin GPS MAP 8008 Volvo Penta
Priced at USD 699.95, this Garmin GPS MAP 8008 stands out because of the Volvo Penta branding in the title. If you are upgrading a helm that already uses Volvo Penta equipment, the brand alignment could be the deciding factor. The part number is 2VD000078, and the unit includes NMEA 0183, NMEA 2000, network, video, and power connections, so it is positioned as a device that can tie into a boat's existing systems. The touchscreen control is another useful feature. The limitation is that the Volvo Penta branding makes this a more targeted unit than the general-purpose chartplotters in the group. If you do not have Volvo Penta components, that branding may not add anything for you, and the Simrad NSS12 at USD 1,199.95 covers more marine functions at a higher listed price.
Garmin GPSMAP 1222 12-inch Chartplotter
The Garmin GPSMAP 1222 carries the highest listed price in this group at USD 1,300.00. Its 12-inch display has a 1280 x 800 resolution, and the unit offers keypad controls, an internal GPS and GLONASS receiver, and network capability for compatible Garmin systems. It is listed as used, black, and made in Taiwan. If you prefer physical buttons while still getting a large screen, this is the unit to choose. The concrete limitation is the price gap to the Simrad NSS12: USD 1,300.00 versus USD 1,199.95. The Simrad NSS12 includes touchscreen control, fishfinder, radar, and enhanced charts, so if those functions matter to you, the Garmin GPSMAP 1222's higher listed price may be harder to justify.
Final Recommendation by Use Case
- For GPS signal simulation or chartplotter testing: The Navionics GPS Signal Simulator Ver 3.0 is the unit to look at, with the lowest listed price at USD 299.00 and a 90-day warranty.
- For a touchscreen all-in-one MFD: The Simrad NSS12, at USD 1,199.95, covers chartplotting, fishfinding, radar, and GPS in a 12-inch touchscreen unit.
- For a Volvo Penta-oriented helm: The Garmin GPS MAP 8008, at USD 699.95, has Volvo Penta in the title and multiple NMEA and network connections.
- For keypad fans who want a 12-inch display: The Garmin GPSMAP 1222, at USD 1,300.00, offers keypad controls, internal GPS/GLONASS, and network capability.
