Mark 4 Chirp Fish-finder / Chart-plotter. With transom mount transducer 83/200/455/800kHz. Easy-to-use 4.3-inch fishfinder / chartplotter with Hybrid Dual Imaging that combines Broadband Chirp Sounder with DownScan Imaging technology, super-bright, LED-backlit grayscale display, built-in GPS antenna and options for high-definition mapping.Lowrance-exclusive, high-resolution, 4.3-inch, LED-backlit display Exclusive Hybrid Dual Imaging (HDI) Broadband Chirp Sounder plus DownScan Imaging -- the power of two award-winning technologies combined to provide the best possible view beneath your boat. Highly accurate, built-in GPS antenna. Optional chart upgrade is - Navionics® Plus Small Download Create your own map from real sonar data that you record with Insight Genesis (optional) DownScan Overlay technology overlays DownScan Imaging onto Chirp Broadband Sounder Advanced Signal Processing (ASP) reduces the need to manually adjust settings to see fish, structure and bottom detail more clearly TrackBack to review recorded sonar history including structure, transitions or fish targets, then pinpoint locations with a waypoint. New easy-to-use page selector menu with quick access to all features using one-thumb operation Multi-Window Display lets you quickly and easily choose from pre-set page layouts -- including a three-panel view with chart, Chirp Broadband Sounder and DownScan Imaging.
CHIRP is a frequency-modulated sonar pulse. Traditional echo sounders rely on a distinct Frequency pulse rebounding off Fish, an object or the bottom, ie 83 kHz, for deepwater Fish finding, or 200 kHz, in shallower water. The amount of energy required for the signal to reach the bottom in deep water when using a low Frequency signal (say 83kHz), requires a long sonic pulse (possibly 40m in length).Any objects that are closer together than the length of this pulse will not show up as separate objects on the Fish Finder screen. CHIRP technology modifies the pulse that is sent by the Transducer. Instead of transmitting a distinct pulse beneath the Boat, CHIRP technology modifies the pulse so that a range of frequencies are transmitted by the transducer; say 73 to 93 kHz, or 180 to 220 kHz. When you transmit a modulated pulse across these ranges, targets that are closer together than a particular pulse length, reflect that pulse at a different Frequency to those further apart than the pulse length, and each will show up separately on the monitor. This range or pulse sweep is known as the bandwidth, hence the term Broadband Sonar. The echo signal return from a target, is the same as the Frequency with which the target was struck, so two targets even close together in shallow water will return a slightly different Frequency signal. The result is quite simply, stunningly improved separation and detail. It can be summed up simply as DEEPER BROADER CLEARER GAME CHANGING TECHNOLOGY. Is a small family run Marine Engineering Company.
We pride ourselves on offering a super fast, friendly and knowledgeable service. We have been established for 15 years and are agents for.VAT receipts are available on request and we do accept credit cards. If you have any concerns regarding the suitability of the item in this listing. If you feel that we haven't excelled please tell us so that we can try to resolve the situation. The item "Lowrance Mark 4 Chirp Fishfinder / Chartplotter with transducer 000-11824-001" is in sale since Wednesday, July 18, 2018. This item is in the category "Vehicle Parts & Accessories\In-Car Technology, GPS & Security\GPS & Sat Nav Devices\Other GPS & Sat Nav Devices". The seller is "bottomlineltd" and is located in Douglas, Isle of Man. This item can be shipped worldwide.