Marine Navigation & Instruments - GPS - Chartplotters

A marine chartplotter is a GPS-enabled navigation device that displays your vessel's real-time position on an electronic nautical chart, helping you plot courses, mark waypoints, and navigate safely on the water. Most chartplotters also integrate with other onboard systems like sonar, radar, and AIS for a fuller picture of your surroundings.

Marine GPS chartplotters are designed for boat owners, anglers, and recreational or commercial mariners who need reliable on-water navigation beyond a basic handheld GPS. They are especially useful for anyone navigating unfamiliar coastal waters, offshore fishing grounds, or busy waterways where accurate positioning and chart detail matter most.

Start by considering your boat size, helm space, and how you plan to use the chartplotter, since screen size, mounting style, and network compatibility all vary across marine GPS chartplotter models. Also think about whether you need built-in GPS, Wi-Fi connectivity, or a pre-loaded chart package, as these features differ significantly between available options.

Marine GPS chartplotters are available in screen sizes ranging from compact 4-inch displays up to 12-inch multifunction displays, and smaller boats typically do well with a 7-inch or 9-inch screen that balances readability with helm space. Larger screens are better suited to center consoles or cabin cruisers where there is more room at the helm station.

Yes, many marine GPS chartplotters include an internal GPS receiver and antenna built directly into the unit, so no separate antenna is required for basic operation. However, some models are also compatible with an external GPS antenna, which can improve signal reception when the chartplotter is mounted inside a cabin or below a hardtop.

Marine GPS chartplotters in this category commonly support chart formats from providers like Navionics and C-MAP, with some units coming pre-loaded with a chart package and others requiring a separately purchased chart card. Choosing a chartplotter compatible with your preferred chart provider ensures you get the coastal or inland coverage that matches your boating area.

Yes, a handheld marine GPS is a portable, battery-powered device suited for backup navigation or use on smaller vessels, while a fixed-mount chartplotter is permanently installed at the helm and typically offers a larger screen, more processing power, and deeper integration with onboard electronics. Both serve legitimate navigation roles depending on your boating needs.

Because a multifunction display chartplotter combines GPS navigation with the ability to connect sonar, radar, cameras, and other marine electronics into a single screen, reducing clutter at the helm and giving boaters a more complete situational awareness picture. A standalone GPS unit provides position data but cannot integrate with other onboard systems the way a networked chartplotter can.

No, many marine GPS chartplotters are designed for straightforward owner installation using standard mounting hardware and a boat's 12-volt power supply, though professional installation is recommended if you plan to network the unit with radar, sonar, or other onboard electronics. Always follow the manufacturer's wiring and mounting guidelines to ensure safe and reliable operation.

Marine GPS chartplotters should be kept clean by wiping the screen with a soft, damp cloth and avoiding abrasive cleaners that can scratch the display. When the vessel is stored for an extended period, using a protective cover for the chartplotter helps prevent UV damage and keeps the touchscreen or keypad free from dust and moisture.