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How Fish Finders Work

Fish finders operate under water to map contours, identify objects, including fish, and create a picture on the display of everything they find. These are not cameras so the resulting display is not like looking at a video or a photo of the underwater scene. Rather they identify objects using sonar technology and then interpret the scene using a graphical representation. Using sonar, (sound waves) they send signals out in the water. When the signal hits an object it bounces back to the fish finder. Using specialized signal processing computations and by analyzing the return signal, this helpful piece of marine electronics can give you a lot of information about encountered objects.

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Primary Components
A fish finder is made up of two primary components, the display and the transducer. The transducer is the power source that sends a beam into the water, processes the returning signal and sends it to the display screen. The transducer can be mounted directly on the outside hull of the boat - called a transom mount, or through a hole in the hull of the boat looking directly down into the water under the boat.

Understanding the Specs

Cone Angle refers to the size of the beam that spreads out under the water to provide coverage. Angles are represented in degrees and only objects in the cone angle can be identified. A long narrow cone focuses down in deep waters whereas a wide short cone identifies fish over a wider area in shallow waters. Beams can vary from about 60 degrees to 120 degrees. Multi-beam Fish Finders use more than one beam set at different angles to cover the water at shallow and deeper depths at once.
Frequency is the strength of the sonar signal measured in KHz. It works together with the cone angle to determine whether the beam will be focused on deep water or shallow water. Lower frequencies can penetrate the water more deeply than higher frequencies (50 KHz is low frequency whereas 192 or 200 KHz is high frequency).

Display Screens
Look for high resolution, sunlight viewable displays so that it is easy to distinguish features in strong sunlight. Some fish finders have color displays while others have black and white. Remember these are not photos but rather representations so sometimes it is easier to see contrast in black and white, though color can be used effectively to distinguish different targets such as fish, rocks, etc.

Integrated Fish Finders
Most people want different marine electronics components for a variety of different purposes. It can be cost effective to buy a fish finder that is combined with a GPS or a chart plotter. In addition to saving you money such integrated instrument has the added benefit of taking up less real estate on your boat's dash.

Buying a Fish Finder Transducer - What You Must Know

Buying a fish finder may be a daunting task with all the models that are available, but buying a fish finder transducer is even more difficult, particularly because information comparing the key attributes of these devices is typically less prevalent across the boating industry.

First, you should know that a fish finder transducer can come in both single and dual frequency models. The most common operating frequencies are 50 kHz and 200 kHz. Models that use higher frequencies (e.g, 200 kHz) are more precise than lower frequency units, but will not have the same depth penetration as a lower frequency model. Thus, if you anticipate going boating or fishing in deep water, you will probably want to make sure that you buy a transducer that operates on a low frequency (either by itself, or as a dual mode with a higher frequency).

Secondly, the cone of the fish finder transducer is important as it determines the area underneath of the boat that is covered. Obviously, the wider the cone, the larger the area that is covered and the more data that can be streamed to your fish finder. Typically, the lower frequency models (which have better depth penetration but don't have as much detail as higher frequency models) also typically have wider cones than their higher frequency counterparts.

Lastly, you will need to decide on the way that the transducer is mounted to your boat. They typically are sold as either transom mount (mounted at the back of the boat) or a through-the-hull mount (bonded to the inside of the hull). While a through-the-hull mount protects the transducer from the elements and means it is less likely to be damaged, much more care is needed to install it correctly, and of course the effectiveness of the transducer may be less considering it is now shooting its beam through the boat into the water.

Whatever choice you make when you decide to buy a fish finder transducer, it will surely help you find those fish, making your boating experience much more enjoyable.

Wireless Fish Finder - Enjoy the Recreational Fishing Activity

Fish finders are the most essential accessory which brings bread and butter to every fisherman. These wireless fish finders not only help them to discover the fishes in the Deep Ocean but also help them to check the deep topography and get familiar with the mysteries of the water. This fishing accessory can help you to the market stores and flourish with these essential accessories for every fisherman! I am sure that you will stay alert when you are selecting these accessories.

Here are some important aspects which must be kept in mind when you are investing your bucks on the wireless fish finders. I am sure that you will be gratified by the important facts which are mentioned in this article.

Functioning Of Wireless Fish Finder
This product can be easily fixed with the help of a transform mount or any hull. This is a portable device which can be easily transported from one place to another. This is the main benefit of this product as over the fixed fish finder. I am sure that you will love to hunt for the fishes and enjoy carrying this device all over the sea shore. Portability and easy transportation is the prime feature which tempts every fisherman.

You can easily hunt the fishes with these devices. Irrespective of your location, you can hunt for these animals from boats, ships, piers, river banks cruises and even from tube floats. The transducer of this device is fastened with a floating bob! Yes, you heard it right. The designers of wireless fish finders have fastened the transducer of this fishing accessory with the floating bob. Apart from all this, this floating bob can help you to enjoy the fishing at one place. You do not need to move from place to place when you are enjoying this recreational activity.

This essential fishing accessory can help you to enjoy every second of your fishing activity. This obliging trimming can help you to move your boat from one place to another and hunt for the fishes. The transducer of this wireless fishing accessory works like the normal transducer. It sends the sonar waves and checks the presence of any living being. I am sure that you will enjoy the ease when you are utilizing this fishing accessory.

Try to trace the online websites which can help you to get the tempting discount offers and avert you from extra expenditure. Hope that you will not regret after investing for this device!

How to Choose a Lowrance Fish Finder

When shopping online for discount marine electronics, such as a Lowrance fish finder, it helps a lot to understand a bit about the technology you are shopping for. Here is a quick explanation of some of the terms you will encounter.

Cone Angle

First of all, fishfinders use sonar to probe the depths of the sea or lake bed and determine a picture of what lies beneath the water. When you shine a flashlight into the darkness, the light fans out creating a cone that is narrow at the source and wider at the distant end. Electronics does the same thing. The Cone Angle refers to the spread of the beam at the distant end, so a 90 degree beam offers more coverage than a 20 degree beam. Multi-beam systems, as the name implies, send out more than one sonar beam, cumulatively offering a much wider field of view. The Lowrance HDS-7 Fishfinder and GPS Chartplotter series offer a stunning 120 degree view with superior clarity and magnificent detail.

Frequency

The frequency of the sonar signal is measured in KHz. In general the lower the fish finder's frequency the deeper the signal can penetrate beneath the surface. For very deep waters 50 KHz will give you deep penetration using a relatively narrow cone angle. Much higher frequencies tend to have wider cone angles and do not penetrate the water to the same degree. Equipment operating at a frequency of 200 KHz is well suited to covering a wide area in a shallow lake and can result in a more finely detailed picture of what lies below the surface. Frequency is usually adjustable and dual frequency options are common.

Fish Targets

When the sonar beam encounters an object it returns a signal to the fish finder. The sensitive electronics in the unit analyze the characteristics of the signals returned and are able to distinguish between marine life and other objects. Fish targets are typically represented as a fish symbol on your unit's screen.

Thermoclines

A thermocline describes a layer of water that is at a different temperature from the waters around it. Thermoclines form rapidly in response to changing conditions or they can be a permanent feature of a certain ocean area. Lowrance fish finders represent thermoclines as lines on the display.

Transducer

The transducer is the powerhouse of the fish finder. It controls the frequency of the sonar beam and sends and receives the signals that are interpreted by the equipment into graphical representations. Three important things to know about the transducer are how it mounts on the boat, what frequencies it supports and the cone angle it produces. Transducers commonly mount on the transom, or hull, out of the way of the motor. Transom-mounts are the most common and easiest to install. Some models with high frequency capable transducers may need to be mounted through the hull, which can be a complicated installation requiring a hole to be cut on the hull. The Lowrance HDS-7 Fishfinder and GPS Chartplotter series and the Lowrance HDS-5X fishfinder series come with your choice of 83/200 KHz or 50/200-KHz transducers.

Display Screen

All the detail in the world is not worth much if you can't see it! Many fish finders use LCD color displays. Generally the larger the number of pixels, the better the quality of the display. Grayscale displays use shades of gray to distinguish between natural and artificial structures, the lake bottom and the type or size of the fish. CRT displays come at a higher price but offer higher resolutions and better display quality.

Lowrance makes a full range of fishfinders, FF/GPS/Chartplotter combos and offers a full range of other marine electronics for boating professionals and enthusiasts.

Humminbird SmartCast RF15 Fish Finder

If you haven't already you need to check out the Humminbird SmartCast RF15 Fish Finder. This unit is a fabulous, wireless and portable fish finder. If you fish from a kayak, this portable fish finder is for you. If you fish from a dock, this fishfinder is for you. And if you fish from a small boat this portable fishfinder is also for you.

The Hummingbird SmartCast RF15 portable fishfinder is equipped with a revolutionary sensor/transducer called an Advanced Remote Sonar Sensor (RSS). The RSS unit displays fish up to 100 feet deep and allows for an ultra wide sonar coverage equal to twice the water depth so you can see and catch more fish.

To use the Humminbird SmartCast RF15 portable fishfinder simply cast into the water as you would any lure using a standard rod and reel. Then you can use the portable fishfinder to either profile the bottom and look for fish or to watch fish as they react to the attached bait.

The great features of this fishfinder don't stop there. The whole unit is waterproof, has up to a hundred foot wireless operating range and up to 500 hours of battery life. This portable fish finder is a great tool and sells at an unbelievable price.

When utilizing a Humminbird portable fish finder with a Remote Sonar Sensor, use it to check out potentially productive fishing spots from a safe distance. By casting your RSS in the area a few times to look for fish, you can avoid spooking the fish with the sounds and shadows of your boat. Once your Humminbird portable fishfinder identifies a good fishing spot then you can move in slowly for the catch!

What to Look For in a Fish Finder

One of the hardest parts of putting together a fishing trip is figuring out what supplies you need to bring along. And there are few decisions more difficult or complicated than selecting a fish finder. If you understand what a fish finder is and what it does, then you'll make a better decision when you're ready to buy and maybe even save a few dollars as well.

A fish finder is a device that basically serves as a guide - it measures how deep the water is in the area where you're fishing as well as how much ground there is beneath the water. It will also indicate where and what types of items are floating in the water. It's especially useful for locating fish that you may not be able to see by showing you spots where the fish are likely to be hiding.

These devices use sonar, just like submarines, to measure the distance between your boat and the bottom of the body of water. They are also able to measure the size of any other objects that are in the water. The sonar will only work if you have a transducer on your boat, which is usually installed at the bottom-most level for maximum performance. Once you've added the sonar and the transducer, you'll need to set the speed; this will tell you at what speed your boat should be moving in order to bring in the most fish.

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The in-built GPS system will guide you to the exact point where the fish have gathered. Just keep in mind that while GPS units are great, there are some things they can do and some things they can't. Let's say you've found several objects that look to be about fish-sized - the GPS will tell you where they are, but can't tell you if it's really fish or something else that you're following. Also, GPS does not provide information on depth of objects, which is why the sonar technology is so critical to a successful fishing expedition.

Another great feature to look for in a fish finder is a device for reading water temperatures. Different fish like different water temperatures, and if you know which prefer warm to cool and vice versa, you'll know which fish to look for on that day.

Garmin 400C Dual Beam Fish Finder Features and Tips

The Garmin 400C Fish Finder is a great fish finder for freshwater fishing. It can also be used for salt water fishing, but an upgrade to a separate dual frequency transducer will be necessary. With its bright, high resolution, color display this Garmin FishFinder will help you to easily spot the fish even in bright sunlight. The display also has a backlight feature which allows for easy operation during your night fishing trips.

The Garmin 400C FishFinder comes standard with a dual beam 80/200 kHz transducer that allows for depth penetration of up to 900 feet. (Keep in mind that murky or cloudy water can diminish the exact depth the fish finder can reach.) This transducer is best suited for freshwater fishing due to its depth penetration.

The dual beam transducer offers a 45 degree cone angle on the 80 kHz setting and a 14 degree cone angle on the 200 kHz setting. This feature will allow you to see a wide area at more shallow depths and will help you zone in on those hard to see fish at the deeper depths.

If saltwater fishing is in your future it is recommended to upgrade to a separate dual frequency transducer. The dual frequency model will penetrate up to 1500 feet and has cone angles of 45 degrees and 10 degrees depending on the setting. As with the dual beam transducer you will see a wider area at more shallow depths, but with this transducer you will be able to spot those hard to see fish up to depths approaching 1500 feet.

Whether you choose to catch fish in freshwater or saltwater this Garmin FishFinder can be a great tool for you.

Remember that this model comes standard with a dual beam transducer, but that you can buy a dual frequency transducer if desired.

FishFinder Tips

There are a few things to keep in mind when cleaning your fish finder's display. First, you should make it a habit to gently clean the fish finder display after every fishing trip. This best practice, along with the tips below, will keep it in good condition the longest.

When cleaning the unit's casing (except the display screen) use a damp cloth and mild detergent solution. Then wipe dry. Do NOT use chemical cleaners or solvents as these may damage any plastic components. To clean the display screen use an eye glass lens cleaner and a dry cloth. The reason for using this type of cleaner is because fish finder displays generally have an anti-reflective coating. Cleaners containing ammonia, anti-grease detergents, alcohol or abrasives can damage this coating so use an eye glass cleaner that specifically states it is for use on anti-reflective surfaces.

Most fish finders are also waterproof and withstand being submerged for short periods of time. (Check your model's owner's manual to be sure.) Be aware though that submersion for an extended period of time (generally over 30 minutes) may cause irreparable damage to the unit. If you fish finder is submerged, dry it with a clean cloth and then allow it to air dry completely before your next fishing trip.

How to Choose a Fishfinder to Improve Your Fishing Odds

Modern sonar processing electronics combined with ultra sensitive sensors detect marine life using sound wave emitters that bounce off objects to produce a digital map of what lies in the water. How does the fishfinder tell the fish from the rocks? If you fill several glasses of the same size with different amounts of water and then "ping" the glass with your thumb and forefinger, the glasses make different sounds or tones, depending on the amount of water in them. This is similar to how a Lowrance fishfinder distinguishes different objects; the frequency of the signal created when the object is struck by the sonar wave can help determine what kind of object it is. This is an evolving science. As we learn more, and improve existing technologies, you can expect to see the accuracy of object detection improve over time.

A good fishfinder display, such as the Lowrance HDS-5X Fishfinder, will show you the contours of the surface below the water (up to certain depths), and distinguish and mark with different symbols the fish and vegetation as well as any other objects, such as rocks, that are present in the water. Less sophisticated marine electronics simply indicate that objects are present and leave you to figure out the difference between a log and a largemouth bass.

The Lowrance HDS-5X Fishfinder has a powerful transducer that you can set up to 200 kHz and built-in Broadband Sounder technology. It gives you a 120 degree view under the water on its bright wide-angle 5" screen. This model retails for $649. A more economical fishfinder from Lowrance is the X67C Ice Machine. This lightweight, portable sonar device probes depths down to 600 feet and comes with a carrying case and battery charger, making it perfect for ice fishing.

It takes a little practice to use fishfinders. Even though sonar is very precise and can detect and process the presence of objects very quickly, you should also be aware that since the fish are constantly moving, and the boat is also moving or bobbing around, the picture on your fishfinder display is in flux at any moment in time. If the fish stood perfectly still and your boat stopped moving, the picture would be very accurate. As it is, you must accommodate slightly.

Another consideration when viewing the fish in your fishfinder is that the signals from the transducer spread out in a cone shape from beneath the boat. The cone is wider at the bottom and narrower at the top, close to the boat. That means marine life in deeper waters might be further from the boat than fish in shallower waters even though the electronic display makes them appear to be directly under the boat.

Lowrance fishfinders give you the ability to set alarms when you find objects of a certain size or waters of a certain depth (whether shallow or deep) or simply when your battery is low. Also, read the manufacturer's information to see if your fishfinder is more suited to shallow or deep waters and whether it is designed to operate in fresh or saltwater.

Is The Garmin 140 Fish Finder Good Value?

Garmin 140 Fish finder and GPS Combo Review.

Combining a gray scale liquid crystal display with Garmin's unique fish finder engineering, the Garmin 140 fish finder and GPS combo offers the user the perfect solution where limited space is an issue for example;

The standard duel beam wide and narrow scan transducer issued with the unit provides enhanced performance with the duel scan feature of the Garmin 140 fish finder particularly useful when used in shallow water. Mounting the transducer is a cinch and can be installed to a number of places including inside the hull, on the transom or even on a trolling motor but care needs to be taken to ensure that it remains below water level while planing so that air bubbles don't adversely effect the information.

Both wide and narrow beams are used by the duel beam transducer giving the unit more tractability and are governed by the width of transmitted sonar beam and by the depth of water in which its being used. The narrow beam can be of selected use while working in deep water and gives clear displays when at its maximum width For example, the narrow beam would cover an field of around a seven feet circle at a water depth of about 30 feet.

Optimum usage of the wide beam feature of the Garmin 140 is while fishing in shallow water as it supplies the user images of what is around the boat particularly near to the surface. While working in a thirty foot depth, a braod beam would cover an area of that of an approximate 20 feet circle and also displays crisp precise images of objects in the water more close to the surface.

Offering the user very clear images of what's around and under the boat, the Garmin 140 Fish Finder also displays images of the bottom.

The display is enhanced by a back light for night-fishing and can be manually adjusted to suit conditions or turned off completely to extend battery life.

The Garmin 140 also provides the option to be able to save the settings after its shut down giving the user the alternative of being able to find a favorite fishing spot again.

The ultra scroll feature allows refreshing at lightening speed providing accurate up to up-to-date data. Setting the gain to automatic or manual alteration is another characteristic allowing users to control the clarity of images displayed.

Other Garmin Fish Finder 140 features include:

* Range change Auto rescaling

* Improved See Through Technology allowing weak and strong digital signals.

The white line feature allows the user to check on the depth of the bottom underneath the boat.

* 4X and 2X Manual and Auto zoom providing individual user mastery.

* Featured alarms for shallow and deep water, fish and fish size alarm,

A further feature of the Garmin 140 Fishfinder is the low battery level blinker.

The complete package has all you need to successfully attach and use the Garmin 140 fish finder GPS combo and comes with a precise and comprehensive user friendly owners manual containing how to install and use the unit to it's maximum potential.

We guarantee much better fishing results. Check out this new revolutionary invention and get ahead of your fishing friends. Buy the Award Winning 'Esca Lures' online at http://www.innovativefishingtackle.co.uk/

About the Author

We provide ESCA LURES offering quality items at prices far cheaper than the high street. Every item is carefully packaged using the latest technology to ensure safe shipment to you. Enjoy your visit!

www.escalure.co.uk

www.innovativefishingtackle.co.uk

 

 

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This entry was posted on Wednesday, September 8th, 2010 at 10:31 pm and is filed under sterling silver. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.