The essentials in 30 seconds
- 9-inch = standard coastal. Readability 1 m, max 4 windows (chartplotter / depth sounder / radar / instruments). Suitable for 25-35 ft sailboat for coastal use. Budget ~ $1,500-2,000 USD ex-VAT (Raymarine Axiom+ 9 or B&G Vulcan 9).
- 12-inch = offshore standard. Readability 1.5 m, up to 6 windows possible, split-screen charting + radar + AIS + depth sounder simultaneously. 35-50 ft sailboat. Budget ~ $2,800-3,800 USD ex-VAT (Raymarine Axiom Pro 12 or B&G Zeus 3S 12).
- 16+ inch or multi-screens for yacht 50+ ft. Glass-helm solution (Axiom Pro 16, Zeus³S Glass Helm) or 2 × 12-inch side by side. Budget $6,000-12,000 USD ex-VAT.
- Brand choice depends on the ecosystem. Raymarine = versatile cruising (Quantum radar, EV-100 autopilot, ClearCruise IR integration). B&G = racing (H5000 integration, polars, laylines). Garmin = fishing + chartplotting.
- Workshop verdict: 60% of Skysat refits in 2026 go for 12-inch. The ~ $1,000 USD ex-VAT differential between 9 and 12-inch is justified by readability in rough seas + multi-window capacity.
The GPS-sounder combo is the navigation brain of the modern sailboat. Charting, radar, AIS, depth sounder, instruments — everything converges on this screen. Choosing its size (9, 12, 16-inch) impacts safety (readability), comfort (multi-window) and budget (differential $1,000-3,000 USD ex-VAT per tier).
This article distinguishes uses by screen size and presents the references stocked by Skysat. For the charting that feeds the chartplotter, see our marine charting 2026.
Why screen size matters
Three technical criteria separate screen sizes:
- Readability distance based on resolution (typically 1,280×800 on 9", 1,920×1,080 on 12"). 9" readable up to 1 m, 12" up to 1.5 m. On a 40 ft sailboat with helmsman 1.2 m from the combo, the 12" doubles useful readability.
- Simultaneous multi-windows. 9" = max 4 windows before illegibility. 12" = 6 windows (charting 50% + radar 25% + AIS 12.5% + instruments 12.5%). In busy coastal navigation, the advantage is tangible.
- Touch vs buttons. All modern 2026 models are touchscreen (glove-resistant, spray-proof). 9" remains usable with a fingertip. 12" allows true multitouch ergonomics (2-finger zoom, swipe between windows).
9-inch — standard coastal use
The 9-inch is the modern entry point. Suitable for 80% of 25-35 ft sailboats for summer coastal use.
- Raymarine Axiom+ 9: ~ $1,800 USD ex-VAT. HydroTouch touchscreen, 2 GHz processor, internal GPS, native Quantum radar + EV-100 autopilot integration.
- B&G Vulcan 9 R: ~ $1,900 USD ex-VAT. Backlit touchscreen, H5000 integration, polars, laylines. Preferred for racing.
- Garmin GPSMAP 923xsv: ~ $2,100 USD ex-VAT. Touchscreen + buttons (mixed), excellent for fishing, CHIRP sonar integration.
12-inch — offshore use for comfort
The 12-inch becomes necessary as soon as you leave summer coastal waters. 35-50 ft sailboat for offshore cruising, IRC racing, transatlantic passages.
- Raymarine Axiom Pro 12: ~ $3,200 USD ex-VAT. Buttons + touchscreen, ambient sensors, integrated SD reader, ClearCruise IR integration (thermal camera).
- B&G Zeus 3S 12: ~ $3,500 USD ex-VAT. Glass touchscreen, 8-core processor, full H5000 Performance integration. Standard for European IRC racing.
- Garmin GPSMAP 1223xsv: ~ $3,400 USD ex-VAT. Touchscreen + buttons, excellent for remote areas (Quickdraw Contours, ActiveCaptain).
Multi-screens and glass-helm
For yachts 50+ ft, the common solution is multi-screens:
- 2 × 12-inch side by side: main chartplotter + dedicated depth sounder. ~ $7,000 USD ex-VAT complete install.
- Axiom Pro 16 or Zeus 3S 16: single XL screen. ~ $5,500-6,500 USD ex-VAT.
- B&G Zeus³S Glass Helm 16-inch pack with GPS and ZC2 keyboard ($6,618 USD ex-VAT): premium B&G turnkey solution.
Comparative table of 2026 models
| Model | Size | Resolution | Brand | Price ex-VAT |
|---|---|---|---|---|
| Axiom+ 9 | 9" | 1,280×800 | Raymarine | ~ $1,800 |
| Vulcan 9 R | 9" | 1,280×800 | B&G | ~ $1,900 |
| GPSMAP 923xsv | 9" | 1,280×800 | Garmin | ~ $2,100 |
| Axiom Pro 12 | 12" | 1,280×800 | Raymarine | ~ $3,200 |
| Zeus 3S 12 | 12" | 1,920×1,080 | B&G | ~ $3,500 |
| GPSMAP 1223xsv | 12" | 1,920×1,080 | Garmin | ~ $3,400 |
| Zeus S 3015 UltraWide | 15" | 2,560×1,080 | B&G | ~ $4,800 |
| B&G Zeus³S Glass Helm 16 pack | 16" | 1,920×1,080 | B&G | ~ $6,618 |
Workshop verdict by program
25-30 ft sailboat, summer coastal
Economical 9-inch = Raymarine Axiom+ 9 (~ $1,800 USD ex-VAT) or B&G Vulcan 9 R. Total install ~ $2,200-2,500 USD ex-VAT.
35-45 ft sailboat, offshore cruising
12-inch = Axiom Pro 12 or Zeus 3S 12 (~ $3,200-3,500 USD ex-VAT). Skysat workshop standard since 2022. Total install ~ $4,000-4,500 USD ex-VAT.
45-55 ft sailboat, mixed cruising + racing program
Zeus 3S 12 + ZC2 remote = ~ $4,000 USD ex-VAT. If Raymarine ecosystem, Axiom Pro 12 + secondary Axiom Pro 9.
Yacht 50+ ft, pure racing or yacht charter
B&G Zeus³S Glass Helm 16 pack ($6,618 USD ex-VAT) or Zeus S 3015 UltraWide 15" (~ $4,800 USD ex-VAT) + 2nd 12" screen. Total ~ $8,000-12,000 USD ex-VAT complete install.
5 installation errors observed
Combo errors — Skysat workshop
- Undersized screen for reading distance. 9-inch at 1.5 m from helmsman = illegible in rough seas. Measure distance before purchase.
- No external GPS antenna. The combo's internal GPS is masked by the sunshade. Add an external antenna or separate GPS-500 in cabin installs.
- Network cable run parallel to engine cables. RF noise → frozen screens. Always separate signal from power cables.
- No secondary screen offshore. Main combo failure = end of navigation. Always have a backup screen (smartphone Aquamap + Garmin GPSMAP 86s portable GPS is enough).
- Commissioning without HSD calibration (HDG/Speed/Depth). The combo is an aggregator — without upstream sensor calibration, its calculations (VMG, laylines, ETA) are false.
FAQ — Combo in practice
Does the touchscreen resist spray and gloves?
Yes on all 2026 recreational models (Axiom, Zeus, GPSMAP). Specific marine capacitive touchscreen works with thin neoprene gloves (3 mm) and spray. For thick offshore gloves (5 mm + wet), use a remote like ZC2.
Can Raymarine and B&G be mixed on the same boat?
Yes via standard NMEA 2000, but with compromises. AIS/GPS sharing is easy. Raymarine autopilot + B&G Zeus works but loses advanced integration (polars from Zeus to autopilot). Ecosystem consistency remains preferable.
How long does a modern combo last?
Typically 8-12 years before upgrade. Electronics age slower than the touchscreen (calibration drifts after 8-10 years). 2018+ models still run well in 2026.
Touchscreen or buttons offshore?
For quick manipulations in rough seas, physical buttons are superior. Mixed models (Axiom Pro with rotary buttons) are most appreciated in racing and offshore cruising.
Separate depth sounder or integrated?
Integrated is sufficient for cruising (95% of sailboats). Dedicated separate depth sounder (B&G Halo SS35, Furuno DFF) only for big-game fishing or precise bathymetry. For 95% of recreational sailboats, integrated is fine.
3 real-world workshop cases — combo choice
Case 1 — Pogo 12.50 summer coastal family
2023 model, basic equipment. Recommendation: 1 × B&G Zeus 3S 12 (~ $3,500 USD ex-VAT), native C-MAP charting and Triton² integration. Total installed $4,200 USD ex-VAT (combo + accessories + 5 h labor). Owner feedback: "The 12-inch makes a real difference when I need to read the chart and radar simultaneously in rough seas."
Case 2 — Bénéteau First 45 IRC racing sailboat
2024 refit. 1 × B&G Zeus 3S 12 helm + 1 × Vulcan 9 R navtab. H5000 CPU Performance integration. Total combos: $5,400 USD ex-VAT. Choice justified by dual visualization: large chart for helmsman + detailed tactical for navigator. Spi Ouest-France 2025 regatta: "Laylines perfectly visible at both stations simultaneously."
Case 3 — Lagoon 50 charter yacht Caribbean
Setup: 2 × Zeus³S Glass Helm 16-inch + 2 × Zeus 3S 12 repeater. Total: ~ $13,000 USD ex-VAT installed. Justification: market standards for high-end charter (non-professional tenant autonomy + redundancy).
Alternatives ruled out — combos not selected
- 7-inch combos (Vulcan 7, GPSMAP 723xsv): too small for navigation in conditions. Only useful as secondary in the saloon or small racing dinghies.
- Furuno combos (NavNet TZTouch): excellent technically but oriented toward commercial/shipping. Pleasure sailboat integration less refined than B&G/Raymarine. Premium ~ 20-30%.
- Lowrance HDS Live combos: very good for fishing, sailboat integration less advanced. Consider if mixed sailboat/big-game fishing ecosystem.
- Hardened tablets + apps (iPad + Aqua Map, etc.): secondary backup only, never primary. Lack marine robustness (IPX7 waterproofing, button ergonomics in rough seas).
Redundancy strategy — why 2 screens beat one large
On sailboats > 40 ft with ample budget, the question "1 × 16-inch vs 2 × 12-inch" arises. Our workshop verdict:
- 2 × 12-inch preferable in 70% of cases. Reasons: hardware redundancy (1 failure = navigation possible), functional split (main chart + radar + AIS on 1, depth sounder + instruments + polars on 2), helm ergonomics (1 large vs 2 placed at helmsman height).
- 1 × 16-inch preferable in 30% of cases: wide flybridge with single helm station, high-end aesthetics required, integration with existing dashboard.
Skysat distributes Raymarine, B&G, Garmin and Navico. Article based on 80+ sailboat refits 2022-2026. 2026 ex-VAT prices are indicative distributor pricing.
