Vexilar Edge Lc 507 Portable Fish Finder with Transom Mount Transducer & NA Mono Display
The whole idea of the Edge is the ability to see the same thing using two different types of sonar. The Edge is actually two depth finders built into one unit. Each sounder has its own advantages and disadvantages. The goal is to give you the best of both worlds so that you can know more about what's underneath your boat.
TRUE Dual Frequency / Dual Beam Operation
The Edge is not your run-of-the-mill dual frequency depth finder. You truly have two separate sounders with two separate transducers with separate controls.
107 kHz Depth Sounder
The first of the two sounders uses a 107 kHz frequency with a 38° cone angle. This low frequency gives you a lot of power throughout the very wide cone. Low frequencies have an edge over higher frequencies by being able to cover a lot of area or reach into deep water much more efficiently. Lower frequencies also tend to filter out targets of very small size.
400 kHz Depth Sounder
The other half of the Edge uses a 400 kHz frequency offering a 10° cone angle. This high frequency gives a very tight cone for amazing precision. Higher frequencies have an advantage over lower frequencies for these reasons. Higher frequencies will also see small targets the low frequencies miss.
Separate Controls to Fine-Tune Each View
Because the two sounders act so differently, separate controls allow you to make each show you what you want to see. For example, you would generally keep the gain much lower on the 107 than the 400 in the same depth of water. Also, you may be very interested in bottom content, yet at the same time want to see the entire water column with the best view. With separate controls, you can set the range on the 107 to best show bottom content and multiple echoes while keeping the 400 set to show from the bottom up.
Ease of Use
The biggest problem with most high-end sounders these days is the complexity of the controls and menus. The Edge reduces this problem significantly by giving you front panel controls for the most important functions, plus Modes that let set up the system for different situations. These Modes save your front panel and menu settings, when you hit the Mode button to change to a new Mode, your setting for the last Mode are saved. A common practice is to set up your modes they way you want, and from then on, simply turn the unit on and switch between your Modes.