Our Product Research Team
At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere.
That's because we have our own in-house Product Research team — they open the box,
verify contents, check the owner's manual, and record dimensions, features and specs.
We stay on top of new products and technologies to help people make informed choices.
Overview: The Garmin echo 300c is a compact fishfinder designed for
small boats. It features a 3.5" QVGA color display and a 300-watt,
dual-frequency sonar transducer
to help you locate fish in up to 1500 feet of fresh water (600' of salt water).
HD-ID: Garmin's exclusive HD-ID target tracking technology provides
enhanced separation and definition of the images on the screen. It shows
exceptional structure detail and clear bottom contours. The unit can be
set to show suspended targets as sonar "arches" or as a fish symbol with (or without) target depth
Display: The echo 300c features a 3.5" (diagonal) QVGA
display with 240 x 320 pixels. The display has a vertical
orientation with 3-level backlighting (max, 50%, min). The unit comes with a 3" diameter swiveling base that can tilt from 0° to 90° (7
positions) and lock into place. The display has a selectable color scheme, white
or blue, with colors to represent strong, medium, or weak sonar returns. You can
also choose a day or night mode for either color scheme.
Transducer: The dual-frequency (200 kHz/77 kHz) transducer transmits sound
waves through the water and receives them to relay information to the display.
The 200 kHz frequency shows better detail, has a narrower beam (60°) and is
typically used in shallower waters. The 77 kHz frequency penetrates deep water
more effectively, and has a wider beam (120°), so it can be used to cover a
larger area. The transducer has an attached 20' cable to accommodate
large or small boats. The transducer can be mounted either to the transom of the
boat, or to the bottom of your trolling motor. Mounting hardware for both
locations is included.
Viewing Pages: The echo 300c's display scrolls from right to
left to show the sonar readings from the transducer. The bottom depth is
displayed in large numerals, along with the water temperature, and water speed.
The unit has an adjustable depth range (Auto or manual 5' to 1500'), and the
depth scale is shown at the bottom of the screen, along with the transducer
frequency. You can choose from a full screen page or split pages:
- Full Screen Page: The Full Screen page shows a
full-view graph of the sonar readings from the transducer.
- Split Zoom Page: The Split Zoom page shows a full-view
graph of the sonar readings on the right side of the screen, and a magnified
portion of that graph on the left side.
- Split Frequency Page: The Split Frequency page shows
the 77 kHz frequency sonar data, while the right side shows the 200 kHz
frequency sonar data.
Flasher Page: The Flasher page shows sonar information on a
circular depth scale to indicate what is beneath your boat. Shown in the corners
of the page are the voltage, water temperature, water speed, and odometer.
Log Pages: You can view a log of depth readings or water
temperature readings on the full screen. Shown in the corners of the page are
the current reading, the minimum, and the maximum readings. The depth log and
temperature log pages can be shown individually or together on a over/under
Sonar Rewind: The echo 300c lets you pause and then scroll
the screen to view your sonar history.
A-Scope: The A-Scope is a vertical flasher along the right
side of the Full Screen page that shows the range to targets in real time along
a scale. This view expands the most recently received sonar data so that it is
easier to see. It can also be helpful in detecting fish that are located close
to the bottom.
Beeper/Alarms: The echo 300c has a beeper that will sound to confirm
each button press, or can be set to sound only for alarms, or turned off
completely. There are several audible alarms that can be independently set in
- Shallow: The unit will alarm when the water depth is shallower
that the set value (0 to 999.9').
- Deep: The unit will alarm when the water depth is deeper than the
set value (0 to 999.9')
- Battery: The unit will alarm when the battery voltage is lower
than the set value (9V to 28V)
- Fish: The unit will alarm when the device detects a suspended
target. You can set the alarm for all fish, medium and large fish, or large
- Water Temperature: The unit will alarm when the water
temperature varies more than +/- 2°F.
- Drift: The unit will alarm when variations in depth at
your present depth location exceed a specified depth.