ECHOMAP UHD2 93sv
4.6(640)4.6 out of 5 stars, 640 reviews, on Amazon at the time this was writtenA 9-inch chartplotter-sonar with Navionics charts built in — the single most useful electronics purchase for a Great Lakes boat.
Humminbird
Humminbird · Electronics
HELIX 7 CHIRP MEGA SI
4.5(980)4.5 out of 5 stars, 980 reviews, on Amazon at the time this was writtenMEGA side imaging that shows individual rocks and fish out to 125 feet either side — the shallow-water structure tool.
Check price on Amazon$700— HELIX 7 CHIRP MEGA SIPrice shown was accurate on 2026-09-01. Amazon sets the live price.
What's good
- MEGA imaging resolution genuinely resolves individual smallmouth on a St. Clair gravel flat
- 125 feet of coverage per side means one pass covers a 250-foot swath
- AutoChart Live records your own contours as you fish
- Humminbird Basemap plus a LakeMaster card is strong on the connecting waters
What isn't
- Side imaging quality falls off hard past about 40 feet of water depth, so it is a St. Clair and Erie tool, not a Superior one
- 7-inch screen is cramped once you split sonar and chart
- The transducer is long and awkward to mount cleanly on a small transom
We list the drawbacks because a recommendation with no downside is a sales pitch. If a cheaper item does the job on your water, the write-up says so.
Also worth a look
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