Humminbird 515 - Manual (Page 10)

5
What’s On the Display
The 500 Series™ Fishfinder can display a variety of useful information about
NOTE: Entries in this view that list (with Temp/Speed) are available only if the optional-purchase
Timer - elapsed time with Temp/Speed
Accessory.
Average Speed - average speed reading
with Temp/Speed Accessory.
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.
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.
Bait Ball
Hard Bottom
Rocky Bottom
Distance - distance traveled with
Temp/Speed Accessory.
Temperature - water surface temperature.