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 176i | Lowrance Mark-4 | Humminbird 581i DI | |
---|---|---|---|
Screen Size | 4 in | 3.5 in | 5 in |
Screen Resolution | 240 x 160 pixels | 320 x 240 pixels | 640 x 320 pixels |
Display Type | 16-level grayscale | 16-level grayscale | 16-level grayscale |
Imaging | 2D | 2D | 2D and Down Imaging |
Transmit Power | 200W RMS 1600W Peak-To-Peak | 262W RMS 2100W Peak-To-Peak | 300W RMS 2400W Peak-To-Peak |
Sonar Frequency | 455/200 kHz | 83/200 KHz | 200 kHz 2D Sonar 455/800 kHz Down Imaging |
Maximum Depth | 600 ft | 250 ft | 250 ft (DI), 600 ft (2D Sonar) |
Waypoints Storage | 500 | 3000 | 2500 |
Routes | 0 | 100 | 50 |
Trails | 0 | 100 | 50 |
Map Compatibility | Humminbird UniMap | Fishing Hot Spots, NauticPath & Navionics (Hotmpas, Premium and Gold) | Fishing Hot Spots, NauticPath & Navionics (Hotmpas, Premium and Gold) |
MSRP | $129.99 | $199.99 | $299.99 |
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