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The 500 Series™ Fishfinder can display a variety of useful information about
Depth - water depth; can be set to alarm when the water becomes too shallow.
Speed - if a Temp/Speed accessory is attached, your Fishfinder can display the speed of the boat, and can keep a Triplog of nautical or statute miles traveled.
Temperature - water surface temperature.
Timer - elapsed time with Temp/Speed 
Accessory.
Distance - distance traveled with
Temp/Speed Accessory.
Average Speed - average speed reading with Temp/Speed Accessory. 
Bait Ball
Hard Bottom
Rocky Bottom
Second Sonar Return - when the sonar signal bounces between the bottom and the surface of the water and back again. Use the appearance of the second return to determine bottom hardness. Hard bottoms will show a strong second return, while soft bottoms will show a very weak one or none at all.
NOTE: Entries in this view that list (with Temp/Speed) are available only if the
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