Marine GPS Chartplotters

What a Marine GPS Chartplotter Does

A chartplotter receives GPS position data and displays it on a compatible electronic chart, allowing the skipper to see vessel position relative to coastlines, reefs, channels, buoys, anchorages and other chart features. It can also store waypoints, create routes, track ground speed and course-over-ground, and — on units with sonar inputs — display depth and bottom information alongside the chart view.

For a wider view of navigation categories, compare marine navigation before selecting a specific display. Chart coverage and boating charts compatible with the unit should be checked before purchase.

Choosing Screen Size and Features

Screen size affects readability from the helm and how much chart detail is visible at a glance. Smaller displays — typically 5 to 7 inches — suit compact consoles and trailerable boats where space is limited. Mid-range displays in the 9 to 12-inch range are common on fishing boats and day cruisers. Larger screens are typically used on flybridge cruisers or as part of a twin-display helm layout.

Beyond size, consider controls — whether touch, keypad or hybrid suits the way the helm is used in spray and wet conditions. Sonar integration, NMEA networking, AIS overlay and radar integration are all features that vary by model and price point. Check what is included and what requires additional hardware.

Chart Cards and Australian Coverage

Chartplotter usefulness depends on compatible, current chart data. Many units include a base chart but require a compatible chart card for detailed coverage of Australian coastal and inland waters. Check which chart brands and formats are compatible with the unit, which regions are covered to the detail required, how updates are managed, and whether subscriptions are needed. For fishing, check whether the chart data includes sufficient depth and underwater feature detail for the areas where you fish.

Keep chart data current. While electronic charts can be more convenient to update than paper charts, the need to use current, accurate navigation data does not change. Check chart update options and costs before committing to a unit.

Integration with Other Electronics

Many chartplotters can connect with marine radar and marine instruments through a shared network, but compatibility depends on the network standard, cable types, software versions and whether the units are from the same or compatible systems. Review manufacturer documentation carefully before assuming integration will work. A qualified installer can help plan a connected system and confirm compatibility before equipment is purchased.

Installation Checks and Setup

Before purchasing, measure the available mounting space and confirm the panel cut-out dimensions, power requirements, cable routing options and transducer position if sonar is planned. Consider whether the display position allows viewing from the normal helm position without obstruction. In Australian sun conditions, screen brightness and anti-glare coatings are practical considerations alongside navigation features.

A chartplotter is a valuable navigation tool, but it does not replace safe navigation practice. Use current charts, apply local knowledge, keep appropriate backup references and make decisions based on the full picture — not the chartplotter screen alone.