The Garmin brand of Fishfinders uses sonar and with its dual-beam transducers, will show you objects moving below the boat. There is a grayscale image draw of the objects relative size and tells you where they are.
The cheapest Garmin Fishfinders with color display is The Garmin Fishfinder 160C. Here is a link where you can purchase this product and many more alike. http://www.amazon.com/s?ie=UTF8&index=blended&field-keywords=cheapest%20Garmin%20Fish%20finders%20with%20color%20displays&tag=fstfx2-20
Garmin fish-finders are very accurate. They are great products and the employees stand behind their products. They want you to have the best experience ever with their product.
the Garmin Sonar Fishfinders have several features, some I found listed include: automatically adjusting sonar sensitivity, automatic and manual zoom, and a depth reader. I'm sure the features vary by model.
The American company Humminbird is the leading producer of Fishfinder devices. Other companies such as Eagle and Garmin also make well regarded Fishfinders.
One of the highest rated GPS fishfinders is the Garmin echo 150. You can purchase this item from retailers such as Amazon. Once on the page, type "Garmin echo 150" into the search field at the top of the page to bring up the item.
Garmin Fishfinders are widely available at a variety of locales including Walmart, Target, electronics stores like Fry's Electronics and Best Buy, and fishing or underwater supply stores such as Scuba Store, BoatersLand, or West Marine. Of course, they are also available online at Amazon and eBay.
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There is no immediately available technical comparison of the accuracy of different fishfinders. However, to help ensure that you make a purchase which you'll be pleased with, it's good to check out user reviews on reputable seller websites. For example: http://reviews.walmart.com/1336/4660395/garmin-fishfinder-160c-reviews/reviews.htm Look for sites with an established reputation to avoid spam postings.
Unfotunatly Tom-Tom mount was designed for a Tom-Tom Gps, which sadly means that no i will unfortunatly not work for a garmin gps. But you can get Garmin mounts for cheap prices.
The touch screen on a Garmin works by responding to pressure that is appllied to the screen.
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Garmin Mapping Software is available with or without a GPS sensor depending on your laptop configuration. Try Garmin Mobile PC.