Ice fishing runs on a real, separate market from the rest of the fish finder world, and that shows in who builds the equipment: two brands, Vexilar and Marcum, sell almost nothing but ice fishing electronics. That's not a coincidence, a flasher isn't a stripped-down boat graph, it's a purpose-built format for reading a static hole in the ice.
Why ice fishing gets its own category of electronics
The core sonar principle doesn't change with the season: a transducer converts an electrical impulse into a sound wave, and distance is calculated from how long the echo takes to return. What changes on the ice is everything around that principle, you're fishing a fixed hole instead of moving across open water, often for extended periods in freezing temperatures, which is exactly the situation Vexilar and Marcum have each built entire product lines specifically around, rather than adapting a boat unit for occasional cold-weather use.
Vexilar and Marcum: what each brand actually sells
Vexilar's real lineup spans flasher displays across five current models (FLX-8, FLX-12, FLX-18, FLX-28, FLX-38), a live-sonar unit (Vision X10), underwater cameras (Fish Scout Predator, Fish Scout Base Camp), a Wi-Fi-connected Sidekick sonar, ice augers, and dedicated on-ice carrying cases. Marcum covers similar ground with its own sonar and flasher systems (LX-7 G2, MX-7GPS, M-Series Flashers), underwater camera systems (Pursuit HD), lithium battery power built for cold weather, and its own accessory line. Neither company's own site laid out the exact mechanics of how the flasher's circular dial represents signal strength or target size, not found in available sources for that level of detail at the time of writing, so we're not going to describe it more precisely than we can verify.
| Brand | Flasher / sonar line | Also sells |
|---|---|---|
| Vexilar | FLX-8, FLX-12, FLX-18, FLX-28, FLX-38; live sonar (Vision X10) | Underwater cameras, Wi-Fi sonar, ice augers, carrying cases |
| Marcum | LX-7 G2, MX-7GPS, M-Series Flashers | Underwater cameras (Pursuit HD), lithium batteries, accessories |
Can a boat unit work through the ice instead?
Technically, a standard graph-style fish finder can sometimes be adapted for ice use, but it's not what either dedicated ice fishing brand actually builds around, and the boat-focused GPS combo category we cover separately assumes a moving vessel, not a fixed hole, see our GPS fish finder combo guide if that's actually your situation instead. For ice fishing specifically, a dedicated flasher from Vexilar or Marcum is the product both companies have spent their entire business building for.
Battery and cold-weather power
Ice fishing electronics get real, extended use in freezing temperatures, which is why Marcum specifically sells lithium battery power alongside its sonar units rather than treating it as an afterthought. Our fish finder batteries guide covers real battery options for portable and ice fishing units, including the lithium options that matter most in cold weather.
FAQ
How does an ice fishing flasher differ from a regular fish finder?
Both rely on the same transducer/echo principle, but a flasher is built specifically for reading a fixed hole in the ice, and the two dedicated brands in this space, Vexilar and Marcum, build almost nothing else. A regular boat graph fish finder isn't designed around that same fixed, cold-weather use case.
Do I need a dedicated ice fishing unit, or can my boat unit work through the ice?
A dedicated flasher is what the two specialist brands in this market actually build and sell; we don't have a verified source confirming how well a typical boat unit performs through the ice by comparison, so we're not going to claim an equivalence we can't back up.
What's the real difference between Vexilar and Marcum flashers?
Both are real, established ice fishing electronics brands with their own flasher lines, live-sonar/camera products, and cold-weather accessories. We haven't verified a detailed spec-by-spec comparison between specific models from each brand, not found in available sources for that level of head-to-head detail at the time of writing.
Sources
- [S001] Vexilar : official site, (accessed 2026-08-28)
- [S002] Marcum Technologies : official site, (accessed 2026-08-28)
- [S003] Wikipedia : Fishfinder, (accessed 2026-08-28)