Garmin® echo™ 300C DualBeam Sonar Fishfinder
- Sunlight-readable 3.5" diameter TFT color display
- Depths to 1500'
- Dual frequency (200/77 kHz) capable
- Up to 120º of scanning
- Includes quick-release tilt/swivel mount, transducer, trolling motor clamp, and transom mount
Garmin’s echo™ series fishfinders are here. And they’re clearly raising the standard for freshwater sonar performance and ease of use. These systems come with everything you need—including a free trolling motor transducer mount—to make getting on the water faster and easier. With every echo, you can count on clear, concise fish targeting and bottom tracking. So, take a look: You simply won’t find a better fishfinder value for the money.
The Garmin® echo™ 300c features value-priced color sonar, sunlight-readable 3.5" diameter TFT color display, depths to 1500', dual frequency (200/77 kHz) capable, dual-beam, and up to 120º of scanning. Includes quick-release tilt/swivel mount, transducer, trolling motor clamp, and transom mount.
Manufacturer model #: 010-00952-00.
Garmin says it's time to try a better fishfinder:
I'll echo that!''
Scott Martin, Pro Guide and Tournament Fisherman
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What I observed is that in shallow water, the 300c draws about 0.85 amps at 12v. In deeper water (50+ ft) the power draw seemed to increase slightly to 0.92 amps at 12v.
So, to leave a little bit of wiggle room, the 1 amp rating appears to be a good estimate of the steady power draw for the Garmin Echo 300c. This also makes the battery duration calculation very simple. For a given battery capacity given in amp/hours, the echo 300c should run approximately the same number of hours. For instance, a 4.5 amp/hour (or 4500 milli-Amp/hours since 1 Ah = 1000 mAh) battery pack would run the fish finder for about 4.5 hours on a full charge.
It is worth mentioning that deep discharge recommendations vary by battery chemistry. Some battery types may be damaged unless they retain some minimum percentage of their charge capacity. For instance, if a rechargeable 12v lithium battery pack with an 9000 mAh (i.e. 9 Ah) capacity recommends a minimum 1/3 charge, the actual time limit would be 6 hours (2/3 * 9 Ah) for the echo 300c.
It is also worth mentioning that a multi-cell battery pack (like alkaline AA batteries), with the cells in series, has a total charge capacity equal to that of each one of the cells. So, a battery pack made up of 8 individual alkaline AA batteries (typically 2500-3000 mAh) might run the echo 300c between 2 and 3 hours.
and it is an accurate measurment of true temps...this is a great sonar i am happy with the garmin devices....so easy to install and easy to use/read in love with mine...
To understand how this information translates into water temperature at various depths, search the web for "water temperature stratification."
If you want to know the temperature of the water at some depth below the surface, you also need something like a "ProCatch Plus", a "ClineFinder", or some other product that has a temperature sensor you can lower into the water to the depth where you want to measure the temperature (and usually some other stuff like clarity or oxygenation).