Humminbird Helix 7 MEGA SI GPS G4
#5 in Up to 7 inFull review
For anglers who want the clearest imaging in a 7 in unit and will not add live sonar or network gear.
Amazon $649.98$649.98
The Humminbird Helix 7 MEGA SI GPS G4 and the Garmin Echomap UHD2 73cv are evenly matched, rated 3.4 and 3.4. The Humminbird Helix 7 MEGA SI GPS G4 leads on sonar and screen. The Garmin Echomap UHD2 73cv wins on warranty.
Garmin Echomap UHD2 73cv
#9 in Up to 7 inFull review
A 7 in chartplotter for small boats that want maps and down imaging but not side scan.
Amazon $649.99$649.99
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Humminbird Helix 7 MEGA SI GPS G4 for sonar (CHIRP, down imaging, side imaging vs CHIRP, down imaging) and screen (1024 x 600, 170 pixels per inch vs 800 x 480, 133 pixels per inch).
- Choose the Garmin Echomap UHD2 73cv for warranty (2-year warranty vs 1-year warranty).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every up to 7 in fish finder; a clear win is highlighted. How we rank explains each one.
| Factor weight | Humminbird Helix 7 MEGA SI GPS G4 | Garmin Echomap UHD2 73cv |
|---|---|---|
| Overall rating | 3.4/5 | 3.4/5 |
| Value 30% | 30 $92.85 per inch of screen ($649.98, 7 in) | 30 $92.86 per inch of screen ($649.99, 7 in) |
| Sonar 25% | 100 CHIRP, down imaging, side imaging | 65 CHIRP, down imaging |
| GPS and maps 15% | 100 GPS with preloaded maps | 100 GPS with preloaded maps |
| Screen 10% | 58 1024 x 600, 170 pixels per inch | 28 800 x 480, 133 pixels per inch |
| Warranty 20% | 0 1-year warranty | 50 2-year warranty |
Specifications
| Humminbird Helix 7 MEGA SI GPS G4 | Garmin Echomap UHD2 73cv | |
|---|---|---|
| Display | ||
| Screen | 7 in | 7 in |
| Resolution | 1024 x 600 | 800 x 480 |
| Pixels per inch | 170 | 133 |
| Touchscreen | No | No |
| Sonar | ||
| CHIRP | Yes | Yes |
| Down imaging | Yes | Yes |
| Side imaging | Yes | No |
| Live sonar ready | No | No |
| Maximum depth | 1,200 ft | - |
| Transducer | XNT 9 HW MSI 150 T | GT20-TM |
| Navigation and build | ||
| GPS | Yes | Yes |
| Maps | Preloaded | Preloaded |
| Phone pairing | No | Yes |
| Networking | No | No |
| Warranty | 1 year | 2 years |
| Released | 2021-09 | 2022-05-03 |