# Humminbird HELIX 9 CHIRP MEGA SI+ GPS G4N vs Furuno GP-1871F: specs and price compared

A sourced, side-by-side comparison of the Humminbird HELIX 9 CHIRP MEGA SI+ GPS G4N (Humminbird) and Furuno GP-1871F (Furuno) among marine chartplotters.

## Side by side

| Spec | Humminbird HELIX 9 CHIRP MEGA SI+ GPS G4N | Furuno GP-1871F |
| --- | --- | --- |
| US price | not published | not published |
| Brand | Humminbird | Furuno |
| Display size (in) | 9 | 7 |
| Resolution px | 1024x600 | 800x480 |
| Sonar builtin | MEGA CHIRP + MEGA Side Imaging+ + MEGA Down Imaging+ | Built-in TruEcho CHIRP fish finder with RezBoost, ACCU-FISH and Bottom Discrimination |
| Chirp frequencies (kHz) | MEGA CHIRP: full 150-220, narrow 180-240, wide 140-200, optional 28-250; MEGA SI+ 1050-1175; MEGA DI+ 1100-1200; also supports 50/83/200/455/800 | 40-225 |
| Gps type | Internal GPS receiver with trackplotting; Humminbird Basemap preloaded (10,000+ lakes plus US coastal) | Internal 72-channel GPS antenna, WAAS/EGNOS/MSAS SBAS |
| Touchscreen | No | Yes |
| Networking | Ethernet (5-port switch compatible), NMEA 2000, Bluetooth, Wi-Fi, One-Boat Network | NMEA 2000 (CAN bus), NMEA 0183, wireless tablet/smartphone mirroring, compatible with DRS4W wireless radar and NAVpilot autopilot |
| Preloaded charts | Humminbird Basemap (10,000+ lakes plus continental US coastal coverage); LakeMaster/CoastMaster/Navionics compatible but sold separately | None confirmed preloaded; compatible with C-MAP 4D and Navionics chart cards (sold separately) |

## Key differences

- Display size (in): Humminbird HELIX 9 CHIRP MEGA SI+ GPS G4N 9 vs Furuno GP-1871F 7
- Resolution px: Humminbird HELIX 9 CHIRP MEGA SI+ GPS G4N 1024x600 vs Furuno GP-1871F 800x480
- Sonar builtin: Humminbird HELIX 9 CHIRP MEGA SI+ GPS G4N MEGA CHIRP + MEGA Side Imaging+ + MEGA Down Imaging+ vs Furuno GP-1871F Built-in TruEcho CHIRP fish finder with RezBoost, ACCU-FISH and Bottom Discrimination
- Chirp frequencies (kHz): Humminbird HELIX 9 CHIRP MEGA SI+ GPS G4N MEGA CHIRP: full 150-220, narrow 180-240, wide 140-200, optional 28-250; MEGA SI+ 1050-1175; MEGA DI+ 1100-1200; also supports 50/83/200/455/800 vs Furuno GP-1871F 40-225
- Gps type: Humminbird HELIX 9 CHIRP MEGA SI+ GPS G4N Internal GPS receiver with trackplotting; Humminbird Basemap preloaded (10,000+ lakes plus US coastal) vs Furuno GP-1871F Internal 72-channel GPS antenna, WAAS/EGNOS/MSAS SBAS
- Touchscreen: Humminbird HELIX 9 CHIRP MEGA SI+ GPS G4N No vs Furuno GP-1871F Yes
- Networking: Humminbird HELIX 9 CHIRP MEGA SI+ GPS G4N Ethernet (5-port switch compatible), NMEA 2000, Bluetooth, Wi-Fi, One-Boat Network vs Furuno GP-1871F NMEA 2000 (CAN bus), NMEA 0183, wireless tablet/smartphone mirroring, compatible with DRS4W wireless radar and NAVpilot autopilot
- Preloaded charts: Humminbird HELIX 9 CHIRP MEGA SI+ GPS G4N Humminbird Basemap (10,000+ lakes plus continental US coastal coverage); LakeMaster/CoastMaster/Navionics compatible but sold separately vs Furuno GP-1871F None confirmed preloaded; compatible with C-MAP 4D and Navionics chart cards (sold separately)

## Sources

- Humminbird HELIX 9 CHIRP MEGA SI+ GPS G4N: https://humminbird.johnsonoutdoors.com/us/shop/fish-finders/helix/helix-9-chirp-mega-si-gps-g4n (humminbird.johnsonoutdoors.com, verified 2026-08-01)
- Furuno GP-1871F: https://www.furuno.com/en/products/chartplotter/GP-1871F (furuno.com, verified 2026-08-01)

Canonical: https://frontdeskreview.com/gear/marine-chartplotters/humminbird-helix-9-chirp-mega-si-plus-gps-g4n-vs-furuno-gp-1871f/
Cite: Per The Front Desk Review, Humminbird HELIX 9 CHIRP MEGA SI+ GPS G4N (not published) vs Furuno GP-1871F (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/marine-chartplotters/humminbird-helix-9-chirp-mega-si-plus-gps-g4n-vs-furuno-gp-1871f/
License: CC BY 4.0.