When you shop for marine electronics sonar navigation, the first decision isn't just which chartplotter to buy - it's how much you want to pay and what you're willing to accept in a used unit. The four listings here illustrate that trade-off: the least expensive unit is listed at $99.90, the most expensive at $699.95, and the difference between them is $600.05. A buyer can leave with a compact used Garmin, a used Garmin with mounting basics included, a new-condition unit, or a large Garmin Volvo Penta model with a wide array of connections.
Quick take
Shoppers can pick from a compact used Garmin marine and land navigator, a used Garmin chartplotter that includes a suncover, mount, and power cord, a 5-inch unit with dual chart systems, and a large Garmin Volvo Penta model with a long list of connection options. The least expensive option gives you a Garmin model name without a big outlay. The most expensive option trades that low price for a large screen and significantly more connectivity. The two middle options sit close in listed price but differ in condition and included accessories, so the choice there is about whether new condition or a bundled mount and power cord matters more to you.
Listed price comparison
| Product | Listed price | Price bar |
|---|---|---|
| Garmin GPSMAP 478 Marine Land GPS Navigator Chartplotter | USD 99.90 | |
| Garmin GPSMAP 440S Marine Boat GPS Chartplotter | USD 279.99 | |
| Boat GPS Navigator 5in Marine GPS Navigator AIS | USD 336.52 | |
| GARMIN GPS MAP 8008 Volvo Penta Chartplotter | USD 699.95 |
The two middle units are close in listed price, so their differentiators are condition, screen size, and what is included. The cheapest unit is used, and the most expensive offers the widest connection list in the group.
Decision matrix
| Product | Best for | Keep in mind |
|---|---|---|
| Garmin GPSMAP 478 | A shopper focused on the lowest listed price with a Garmin model name | Used condition; wear can vary and cables or accessories are not assumed |
| Garmin GPSMAP 440S | A shopper who wants a used Garmin chartplotter that is essentially ready to mount | Used condition; marine-boat focus in the title |
| Boat GPS Navigator 5in | A shopper who wants a unit listed as new | Brand and part number are generic; gtin is not applicable |
| GARMIN GPS MAP 8008 Volvo Penta | A shopper who wants touch screen control and extensive system integration | Highest listed price; not in original packaging |
Product notes
Garmin GPSMAP 478 Marine Land GPS Navigator Chartplotter
The least expensive option is this used Garmin, and the manufacturer part number 478 gives it a specific model identity. The unit has been fully tested and is in good working condition, with wear that can vary between items. Cables, adapters, chargers, and other accessories should not be assumed to be included, so what you see in the unit's photos is what matters. The reason to choose it is the low listed price combined with a named Garmin model for both marine and land navigation. The limitation is the used condition and the fact that the included accessory set is not spelled out.
Garmin GPSMAP 440S Marine Boat GPS Chartplotter
This used Garmin chartplotter sits in the middle of the price range and comes with a suncover, mount, and power cord. The manufacturer part number is GPSmap 440S, and the country of origin is the United States. The reason to choose it is the completeness of the package: a mount and power cord are the kind of items that often need to be sourced separately for a used unit. The limitation is that this is a pre-owned piece of electronics, and the title focuses strictly on marine boat use without any land navigation capability mentioned, unlike the GPSMAP 478.
Boat GPS Navigator 5in Marine GPS Navigator AIS
The title highlights a 5-inch TFT LCD screen with LED backlight and AIS, and the unit carries a 480 x 272 (WVGA) resolution, dual GPS and compass positioning, DC12-36V wide voltage input, and a dual chart system built around C-MAP and XINUO MAP charts. Universal fitment and a country of origin of China are specified. The reason to consider it is the ability to switch between two chart systems in one unit. The limitation is the lack of a concrete brand or manufacturer part number; both are listed as "As the description shows," so the model identity is generic.
GARMIN GPS MAP 8008 Volvo Penta Chartplotter
The most expensive option is also the only touch screen model in the group. The manufacturer part number is 2VD000078, the manufacturer is GARMIN, and the Volvo Penta name appears in the title. The unit includes NMEA 0183, NMEA 2000, four network connections, DVI-I video, two CVBS inputs, and engine and house connections, which make it the most connection-rich choice here. The reason to consider it is the touch screen and the broad range of ports for connecting multiple onboard systems. The limitations are the highest listed price in the group and the fact that the unit is not in original packaging and comes as shown.
Final recommendation by use case
- Lowest listed price: Garmin GPSMAP 478.
- Mid-range listed price with a complete package: Garmin GPSMAP 440S.
- New-condition listing: Boat GPS Navigator 5in.
- Most extensive connection options: GARMIN GPS MAP 8008 Volvo Penta.
