Hawkeye Portable Depth/Fishfinder
How about one of these?
NORCROSS MARINE
Hawkeye Portable Depth/Fishfinder
The DF2200PX is the newest and most versatile portable depth finder ever produced! Not only will this depth finder give you instant depth readings, from 2.5 to 199 Feet, in 1/10th precision, but at the press of a button the display will give real time temperature (water or air) and fish readings.
Use it in the winter to shoot through ice before cutting your hole. Use it in the summer as a range finder and temperature meter while diving. Use it as a backup depth finder on your pleasure boat or scan for channels in your dingy. No matter how you use it, the DF2200PX is one piece of equipment you should never leave the dock without.
SideScan™ Fish Detecting Sonar With SideScan fish readings, there's no guessing where the drop-offs are or where the fish are hiding. One press of the button on the DF2200PX depth finder scans an area for drop-offs, ledges, or hiding fish. Scan under weeds, lily pads, and docks for trophy lunkers right before you make your cast.
60% More Powerful!
Depth Readings from 2.5 - 199 Feet (.7 to 60.1 Meters)
Water or Air Temperature Readings from 14 - 122 Degrees F or C
ShootThru Technology Reads Thru Boat/Kayak/Canoe Hulls and Ice
SideScan Fish Detecting Sonar Pinpoints Hiding Fish
Waterproof to 200 Feet for Diving
Maintenance Free Button
SoftGlow Backlit LCD Display
Polarized LCD measures .93 x .63"
10 Hour Continuous Use on 4 'AA' Batteries
7 x 2 x 2" Unit Size
Sonar Angle 20 Degrees
Sonar Frequency 200 KHZ