Should I get sonar built-in or as a separate transducer?

Built-in CHIRP sonar in the chartplotter is the modern norm — saves money and dashboard space. Add a more powerful standalone sonar only if you fish seriously offshore.

Garmin vs Raymarine vs B&G — which brand?

Power boaters and freshwater anglers: Garmin. Offshore cruisers and Raymarine-radar owners: Raymarine. Sailors: B&G. Furuno for commercial-grade reliability.

Do I need a separate AIS receiver?

Many chartplotters include AIS receive. To transmit your own position (Class B), you need a separate transponder ($600–$900) plus an AIS-capable VHF antenna or splitter.

How long do chartplotters last?

5–10 years of useful life. Screens degrade with UV exposure; processors get slow as charts grow. Plan to replace at the 8-year mark before the manufacturer drops support for chart updates.

Can I use my phone or tablet instead?

Apps like Aqua Map, iSailor, and Navionics Boating run on iPad and rival a dedicated plotter for inshore use. Limitations: sunlight readability, water resistance, integration with sonar/radar/autopilot. Use as backup, not primary, for any serious cruising.

Touchscreen, buttons, or both?

Both. Touch is faster for panning and waypoints in calm conditions; physical buttons are essential in spray, gloves, or rough water when wet fingers won't register. The best units (Garmin GPSMAP, B&G Vulcan FS) offer both.

What's the spec that matters most for sunlight?

Display nits. Look for 1,200+ nits for true bright-sun readability. Anything under 800 nits washes out at noon. Also check if the screen has bonded glass (laminated to the LCD) — bonded screens look sharper and resist condensation.

Best Marine Chartplotters in 2026

By Sam Halberstadt · Reviewed by Marina Chen

Editor · USCG-licensed Master 50 GT · Updated May 6, 2026

Some links on this page are affiliate links — we may earn a small commission at no extra cost to you. We only recommend gear we'd use ourselves. Read disclosure.

How we tested

Display quality in direct sunlight — a chartplotter you can't read at noon is a $1,500 paperweight.

Chart subscription cost over 5 years (this dwarfs the hardware cost over time).

Integration with sonar, AIS, radar, and autopilot — proprietary networks (Garmin Marine Network, Raymarine SeaTalk NG, B&G CZone) lock you in but work better than NMEA 2000 alone.

Reliability based on user reports across cruising forums and our own units' uptime.

UI usability — number of menu taps to mark a waypoint, plot a route, set an alarm.

Screen size and the boat-size rule

Under 22 ft: 7-inch unit ($800–$1,200). Bigger screens just don't fit at the helm.

22–32 ft: 9-inch unit ($1,200–$1,800). Sweet spot for visibility vs price.

32–45 ft: 12-inch or two networked 9-inch units ($2,000–$3,500). Split screen for chart + sonar + radar.

Over 45 ft: 16-inch primary at the helm + 9-inch repeater at nav station, all networked. Budget $5,000+.

Brand differentiation

Garmin GPSMAP series: best-in-class display, intuitive UI, large dealer network, ActiveCaptain community data integrated. Charts via BlueChart g3 (one-time purchase) or Navionics (annual subscription).

Raymarine Axiom+: RealVision 3D sonar is genuinely useful, LightHouse charts are excellent and free for US waters, integrates with FLIR thermal cameras.

B&G (Navico): clearly the best for sailors. SailSteer overlays apparent wind, true wind, laylines, and tactical data. Forward-scan sonar (ForwardScan) shows depth ahead of the boat — invaluable in unfamiliar shallow water.

Furuno: workhorse commercial-grade gear. Slower UI, dated screens compared to Garmin/Raymarine, but bulletproof reliability and the best radar in the industry.

Chart subscription costs (the hidden expense)

Navionics+ subscription: $80–$130/year. Auto-updates, sonar overlay, community edits.

Garmin BlueChart g3: ~$200 one-time per region, lifetime updates included for the first three years.

Raymarine LightHouse: free for US, Bahamas, parts of the Caribbean. Premium subscription ($30/year) adds streets, marinas, hazards.

C-MAP (Navico/B&G): subscription model, $130–$200/year for full coverage.

Networking, autopilot, and N2K vs proprietary

NMEA 2000 is the universal backbone — every modern chartplotter speaks it, plus engines, sensors, AIS, and most autopilots. A standard N2K trunk with T-connectors and drop cables is plug-and-play and lets you mix brands.

Proprietary networks (Garmin Marine Network, Raymarine RayNet/SeaTalkNG, Navico Ethernet) carry high-bandwidth data — radar overlay, sonar imagery, video, multi-display chart sharing — that NMEA 2000 cannot. Mix-and-match across brands works for basic data; radar and sonar imagery require staying within one ecosystem.

Autopilot integration is the killer feature for cruisers: the chartplotter sends route waypoints directly to the autopilot computer, which steers track-to-track. Garmin Reactor, Raymarine Evolution, and B&G NAC autopilots all integrate cleanly within their own ecosystem; cross-brand integration via NMEA 2000 works for basic heading/track but loses advanced features like wind-driven sail steering.