When you're shopping for a budget marine GPS, the biggest question is often about the unit's condition, not its feature set. Two Garmin chartplotters are close in price right now: the Garmin GPSMAP 478 at USD 99.90 and the Garmin GPSMAP 541s at USD 99.99. Both come with the Garmin badge, but that's where the similarity ends. The 478 is a used marine/land GPS navigator with chartplotter and receiver capability, while the 541s is a marine chartplotter/fishfinder that's being sold as untested and for parts or not working.
Quick verdict
If you want a chartplotter you can use without a major repair project, the used Garmin GPSMAP 478 is the clear winner. It is a used unit that has been fully tested and is in great working condition. The Garmin GPSMAP 541s is the better choice only if you need a low-cost fishfinder unit for parts, or you're willing to troubleshoot a device that's marked "not working" and comes with no cords.
Price and condition at a glance
| Model | Condition | Listed price |
|---|---|---|
| Garmin GPSMAP 478 | Used | USD 99.90 |
| Garmin GPSMAP 541s | For parts or not working | USD 99.99 |
The two listed prices are nearly identical: the 541s is just $0.09 more. So the decision rests almost entirely on what you're willing to accept in terms of device condition.
Where each model makes sense
The GPSMAP 478 makes sense if you need a working navigator now. It's a used unit that has been fully tested and is in great working condition. That kind of assurance is valuable when you're dealing with older marine electronics. The 478 also carries the "Marine Land GPS Navigator Chartplotter Receiver" label, indicating it's designed for both marine and land navigation, though it's not a fishfinder.
The GPSMAP 541s makes sense if you're intentionally buying a non-working unit. It's described as "No Cords Untested" and is in "For parts or not working" condition. That doesn't make it useless, but it means you're taking a gamble unless you have the skills to repair it. It's a fishfinder/chartplotter, so it could be a good donor for parts or a project base if you have access to the needed components.
Product notes
#### Garmin GPSMAP 478
The Garmin GPSMAP 478 is a used marine and land GPS navigator with chartplotter and receiver functions. Its condition is Used, and it has been fully tested and works well. For a secondhand GPS near $99.90, that's a strong sign you can mount it and use it without pulling it apart first. The main limitation is that you should not assume cables, chargers, or other accessories are included. That means you may need to track down the appropriate power and data cords separately. If you're comfortable with that, the 478 gives you a confident path to a functional chartplotter.
#### Garmin GPSMAP 541s
The Garmin GPSMAP 541s is a marine chartplotter and fishfinder, but this example is sold as for parts or not working. The title itself says "No Cords Untested," so you shouldn't expect it to come with cables or to power up when it arrives. It's priced at USD 99.99, effectively the same as the 478, but it carries a much larger risk. The reason to choose it is if you have a specific need for a non-working unit-for instance, to harvest parts or to practice diagnostics. If you need a working fishfinder on your boat, this is not the unit to count on.
Final choice by use case
- If you need a working used marine/land GPS chartplotter, choose the Garmin GPSMAP 478.
- If you want a for-parts Garmin fishfinder unit or are prepared to troubleshoot a non-working device, choose the Garmin GPSMAP 541s.
