I like the EAGLE FISHELITE 480 LCD I use this for ice fishing mount it to my handle bars on my quad drill my hole and drop the transducer down the hole .
With the fishing holes sale on right now you might just get a really wicked deal . I know I paid about 325 for mine . Uses 8 AA batterys to run .
Heres a picture of the unit .
5" (12.7 cm) diagonal screen
Film SuperTwist LCD
High-definition 480x480 resolution
Amber LED backlit screen and keypad
16-level grayscale
Overlay Data feature displays GPS data on sonar screens and sonar data on GPS screens
Resize Window feature allows width adjustment of either picture panel when in split-screen display
Sonar:
Digitally record/play sonar graphs and GPS trip details with optional, reusable compact Multi-Media Cards (MMC) or Secure Digital (SD) memory cards. One waterproof slot for instantly-expandable memory using a single 8MB-512MB card
Depth capability to 800 ft (244 m) with 1500 watts of peak-to-peak power
High-performance, low-profile 200 kHz Skimmer® transducer with built-in temp sensor delivers up to 60ø of fish detection area with high sensitivity settings - Operates at boat speeds up to 70 mph (61 kts)
Trolling speed and distance log readings available with purchase of an optional sensor
FishReveal™ feature exposes fish targets hidden in surface clutter, weed beds, thermoclines, and other types of underwater cover
HyperScroll™; feature locates and displays fish targets at higher boat speeds
FasTrack™ vertical bar flasher displays realtime sonar returns and relative strength of each target
Advanced Signal Processing (ASP™) automatically adjusts your settings for the best sonar picture
Patented GRAYLINE® separates fish from nearby structure and bottom
Advanced Fish I.D.™ shows underwater targets in different sizes of fish symbols
FishTrack™ displays target depth readings above fish symbols
Surface water temperature readings come from a built-in temp sensor in the transducer
Zoom with zoom bottom tracking and easy zoom-in/out control
Selective on/off sonar alarms: Shallow, Deep, Fish and Zone
GPS+WAAS:
12-parallel channel GPS+WAAS reception with fast, strong satellite lock-ons, precise tracking, and position updates every second with the external EGC-12W receiver
Selectable on/off WAAS reception for enhanced position accuracy to 3 m (under 10 ft) at select locations
All-new, built-in Eagle® background map with enhanced continental U.S. and Hawaii detail including nav aids
High-speed map screen updates
Optional MapCreate™ Accessories Pack with MapCreate™ CD software that:
Lets you create unlimited, custom, detailed maps on MMC or SD memory cards
Includes unique, searchable database of streets, a ddresses, and over 700,000 Point-of-Interest (POI) to easily find/identify marinas, restaurants, airports, emergency services, and more
Saves up to 1,000 waypoints, 1,000 event markers, and 100 routes (up to 100 waypoints/route)
100 savable plot trails with up to 10,000 points per trail
42 graphic icons to mark your favorite spots
38 map zoom ranges - from 0.04 to 4,000 miles - with easy zoom-in/out control
Compatible with optional plug-and-play Lowrance FreedomMaps™, Fishing Hot Spots™ Elite, LakeMaster® Pro Maps, and Navionics ® electronic charts
Performance:
Internal back-up memory keeps stored GPS data and sonar settings safe and accessible for years
Completely sealed and waterproof, even for use in harsh sal****er environments
Full one-year warranty