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Humminbird 581i Combo Review

Humminbird 581i Combo has an average rating of 2.75 out of 5 based on 4 user reviews.


The Humminbird 581i Combo is a sonar fishfinder and full GPS locator in one. Target tracking,Trackplotting, chartplotting, mapping, and waypoint creation are all possible with this single unit from Humminbird. And all of it is finely displayed on its 5 inch screen with 16 levels of grayscale and 640×320 pixels of high resolution.

With the internal GPS, there is no need for purchasing and installing an external antenna. The 581i Combo is ready to provide anglers with all of their navigational and plotting needs right out of the box. With the ability to monitor up to 50 satellites simultaneously, users will never be without a strong GPS signal. Used in combination with the unit’s built in memory, thousands of waypoints, routes and tracks can be saved and revisited with ease and precision. Additionally, Humminbird has generously outfitted the 581i with its Unimap. Use Unimap to navigate coastlines, lakes and rivers with stunning detail. Unimap provides 30 meters per pixel of resolution for all major water bodies across the entire U.S. Continent.

For certain serious mariners who may find that their needs exceed Unimap’s capabilities, Humminbird offers some options. Fortunately for these individuals, the 581i is fully compatible with the Navionics line of cartography mapping software. These software upgrades provide worldwide coverage maps along with many extras. An amazing amount of timely and up to the minute information can be procured at the touch of a button. Tides, currents, wrecks, port plans, marsh areas, marine services and more are all included. The 581i provides everything today’s fisherman needs for today and tomorrow.

 Humminbird PiranhaMax 176iLowrance Mark-4Humminbird 581i DI
Screen Size4 in3.5 in5 in
Screen Resolution240 x 160 pixels320 x 240 pixels640 x 320 pixels
Display Type16-level grayscale16-level grayscale16-level grayscale
Imaging2D2D2D and Down Imaging
Transmit Power200W RMS
1600W Peak-To-Peak
262W RMS
2100W Peak-To-Peak
300W RMS
2400W Peak-To-Peak
Sonar Frequency455/200 kHz83/200 KHz200 kHz 2D Sonar
455/800 kHz Down Imaging
Maximum Depth600 ft250 ft250 ft (DI), 600 ft (2D Sonar)
Waypoints Storage50030002500
Map CompatibilityHumminbird UniMapFishing Hot Spots, NauticPath & Navionics
(Hotmpas, Premium and Gold)
Fishing Hot Spots, NauticPath & Navionics
(Hotmpas, Premium and Gold)

User Reviews

Posted by Wayne B.

  • 5/5

I’m very happy with purchase. I was able to install it myself and went out fishing the next morning. It turns out that tge built-in maps are quite good, no need to upgrade to Navionics. My only regret is I should’ve bought it sooner.

Posted by Charles G.

  • 1/5

I was not able to get the GPS on this unit to work. I spent hours on the phone with Humminbird support, mostly waiting for them to answer the call. First they claimed it was my fault, then they offered me to fix it. I was to send it to them and then wait 3 three weeks to get a refurbished item. Instead I opted to return the unit to the store. Will never buy another Humminbird.

Posted by Anonymous

  • 4/5

This is a great unit for warmwater fishermen, but anyone who precision trolls for coldwater species and needs to know the GPS speeds down real slow will need to look at another unit. Even the most basic GPS on earth will give you an accurate speed to the 10th of a MPH. I know this because I have trolled for 20 years using handheld GPS units. This 581i bounces from 0mph to 3mph while sitting still in a parking lot. That is unacceptable for coldwater fishermen. I will still give this a 4 star review, because everything else is great, it’s just not for salmon or trout trollers.

Posted by Neil MacPherson

  • 1/5

I purchased this unit with the intent of using primarily the GPS, which works well, but the screen resolution is horrible and marking an object underneath me is impossible as it’s to hard to pick it up on the low screen resolution. They show a picture on the package with this awesome picture of bottom structure which is not what you will actually see, my bad so now I am going to pick up the Helix 5 with GPS and take the blow of not doing my homework before buying.

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