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Here are 5 things to know before you buy a marine GPS units/chartplotter: Transducer, List of Garmin products, Sonar, Global Positioning System, and Lake. Make sure you read our 2020 official guide on how to purchase a marine GPS units/chartplotter if you don't know anything about marine GPS units/chartplotters!

It could feel overwhelming to look at all the products if you haven't purchased marine GPS units/chartplotters yourself, or haven't had it at all. This is why we gathered some information for you so you can be more confident before buying a marine GPS units/chartplotter.

Things You Should Know

If you have some exposure to marine GPS units/chartplotters or related types of products, you might already know what some of the words mean. But we don't want to assume that you know and make you struggle while reading product descriptions. Here are the 5 words you need to know:

  • Transducer: A transducer is a device that converts energy from one form to another. Usually a transducer converts a signal in one form of energy to a signal in another.Transducers are often employed at the boundaries of automation, measurement, and control systems, where electrical signals are converted to and from other physical quantities .
  • List of Garmin products (Echomap): Garmin is a company that produces consumer, professional aviation, and marine devices that make use of the Global Positioning System for navigational assistance. Devices such as hand-held GPS units, in-vehicle units are common.
  • Sonar: Sonar is a technique that uses sound propagation to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels. Two types of technology share the name "sonar": passive sonar is essentially listening for the sound made by vessels; active sonar is emitting pulses of sounds and listening for echoes.
  • Global Positioning System (GPS): The Global Positioning System, originally NAVSTAR GPS, is a satellite-based radionavigation system owned by the United States government and operated by the United States Space Force. It is one of the global navigation satellite systems that provides geolocation and time information to a GPS receiver anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites.
  • Lake: A lake is an area filled with water, localized in a basin, surrounded by land, apart from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean.

Appropriate Price Range

Marine GPS units/Chartplotters are normally priced in the range of$70.00 - $1968.30 per item. So if a marine GPS units/chartplotter's price is outside of this range, you should question if the product is actually sold, or the price is worth it.


There are so many options out there on Amazon, but our recommendations can be a good starting point to read and find out what you need.

Recommended: Popular Products on Amazon

We chose these three products because it's the best selling marine GPS units/chartplotters on Amazon. Please check these out on Amazon, and also on ReviewFinch for more detailed analysis.

Recommended: Products With Best Reviews

These are the products we found with really good reviews on the internet. If you're looking for a marine GPS units/chartplotter with good reviews, these are your marine GPS units/chartplotters. Make sure you check the details page for what fans and haters of this marine GPS units/chartplotter had to say.

Recommended: Products On Sale

Here are some products we observed a huge price drop on (more than 20%). Check these out on Amazon to find out the most recent price!

Learn More

If you need more to read about marine GPS units/chartplotters, here are some links we found while researching:

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