Instruction/ maintenance manual of the product 345c Humminbird
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531955-1EN_A 345c and 345c DI Operat ions Manual 345c and 345c DI Operat ions Manual.
T hank Y ou! Thank y ou for choosing Humminbir d®, America’s #1 name in fishfinder s. Humminbird® has built its reputa tion by designing and manuf acturing top-quality , thor oughly reliable marine equipment. Y our Humminbird® is designed for tr ouble-free use in e ven the harshest marine envir onment.
WEE E co mp lia nc e ma y not be r eq uir ed in yo ur lo ca ti on f or e le ctr ical & el ec tr on ic e qu ipm en t (EE E) , no r ma y it b e r eq uir ed fo r EEE d es ig ne d and i nt en de d as fi xe d or t emp or ary ins ta ll ati on in tr an sp ort at io n ve hi cl es s uch a s au to mo bil es , ai rc raft , an d bo ats .
P owe r On 1 Ho w So nar W or ks 2 Du al Be am PLU S™ So na r (D ua lBe am PLU S™ m ode ls o nl y [3 45c ]) . .. .. .. .. .. .. .. .. .. .... .. .. .. .. . 4 Do wn Ima gi ng ™ So na r (D ow n Im ag ing ™ mo de ls on ly [ 345 c DI ]) . .. .. ..
W ha t’s on t he 30 0 Se ri es™ C on tr ol He ad 30 K ey F unct ion s 31 PO WE R/ LI GH T K ey .. .. .. .. .. .. .. .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .... .. .. .. .. .. .. .. .. .. .. .. .... .. .. .. .. .. 3 1 VI EW K ey .
Zo om L e v el ( S on ar Zo o m V ie w on ly ) .... .. .. .. .. .. .. .. .. .. .. .... .. .. .. .. .. .. .. .. .. .. .. .... .. .. .. .. .. .. .. .. .. .. 4 6 Bo tt om L oc k (S ona r Z oo m Vi e w on ly) .... .. .. .... .. .. .. .. .. .. .. .. .. .. .
Su rf ace Cl ut te r .. .. .. .. .. .. .. .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .... .. .. .. .. .. .. .. .. .. .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 61 Sw it ch F ir e™ ... .. .. .. .. .. .. .... .. .. .. .. .. .. ..... .... ..
v Se le ct R ea do ut s (A dv an ce d, S ona r V ie w and Do wn I ma gin g™ V iew o nly ) .. .. .... .. .. .. .. .. .. .. 7 2 De pt h Of fs et ( Adv ance d) .... .. .... .. .. .. .. .. .. .. .. .. .. .. .... .. .. .. .. .. .. .. .. .. .. .. .... .. .
vi NO TE: Entries in this T able of Contents which list (International Only) are only available on pr oducts sold outside of the U.S. by our authorized international distributors. T o obtain a list of authorized international distributors, please visit our Web site at humminbir d.
1 Power On P ower On Follo w the instructions below to power on y our Humminbird® contr ol head. 1. Press the POWER/LIGHT key. 2. When the T itle screen is displayed, pr ess the MENU ke y to access the Start-U p Options Menu.
2 How Sonar W orks Sonar technology is based on sound wav es. T he 300 Series™ Fishfinder uses sonar to locate and define structur e, bottom contour and composition, as well as depth directly below the tr ansducer .
When all the echoes ar e view ed side by side, an easy to interpret “gr aph“ of the bottom, fish, and structure appear s. The sou nd pu ls es are t rans mi tt ed at var iou s frequencies depending on the applica tion. V ery high frequencies (455 kHz) ar e used for gr eatest definition but the operating depth is limited.
4 DualBeam PLUS™ Sonar (DualBeam PLUS™ models only [345c]) Y ou r 3 4 5c Fishfinder uses a 200/83 kHz DualBeam PLUS™ sonar system with a wide (60°) area of cov erage. DualBeam PL US™ sonar has a narro wly focused 20° center beam, surrounded b y a second beam of 60°, expanding your cov erage to an area equal to your depth.
Down Imaging™ Sonar (Down Imaging™ models only [345c DI]) Y ou r 345c DI Fishfinder uses Down Imaging™ technology . The Dow n Imaging™ transducer scans the w ater with razor -thin, high-definition beams. T he beams are wide (side to side) but very thin front to back.
6 Dual Beam Ice T ransducer (o pt io na l- pu rc hase X I 9 20 I ce T ra ns du ce r on ly ) Y ou r Fi s h fi n de r s u pp o rt s t h e op t io n al - purchase XI 9 20 Ice T ransducer which provide s selectable dual-frequency sonar with a wide area of cov erage.
What’s on the Sonar Display What’s on the Sonar Displa y T he 300 Series™ F ishfinder c an displa y a variety of us eful inf ormat ion about NO TE : En tr ie s in thi s vi ew th at l is t (wit h.
8 What’s on the Sonar Display RT S (R ea l T ime Son ar ) W indo w™ Str uctur e - Wh er e fish m ay be h id in g. T he rm oc li ne s - La yer s of wa te r wi th dif f er ent te mp er atu r es t ha t appe ar at di f fe ren t de pt hs an d di f fe ren t ti me s of the y ear .
Understanding the Sonar Display It is important to understand the significance of the display . The dis play does not sho w a literal 3-dimensional repr esentation of wha t is under the water .
10 SwitchFir e™ SwitchFire™ contr ols how the sonar returns are displa yed in the Sonar V iews. SwitchFire™ sett ings are av ailable in the Sonar Menu T ab. T o see the maximum sonar information av ailable within the transducer beam so more fish arches and better jig tr acking are shown, choose Max Mode.
Bottom Presentation As the boat mov es, the unit charts the changes in depth on the display to create a profile of the Bottom Contour . T he type of bottom can be determined from the return charted on the display . A Hard Bottom such a s comp acte d sedi ment or f la t ro ck a pp ear s as a t hinn er lin e ac ros s t he d is pl ay .
12 Structure ID® represents w eak returns in blue and str ong returns in r ed. WhiteLine™ highlights the str ongest sonar returns in white, resulting in a distinctive outline.
What’s on the Do wn Imaging™ Display Down Im agi ng™ uses i ts u niq ue tran sdu cer and so nar t ech nol og y to provi de definition profiling beams produce the detailed sonar da ta that y ou s.
14 What’s on the Down Imaging™ Display (Down Imaging ™ models only [345c DI]) information about the ar ea directly belo w your boa t. T he razor -thin, high- display .
Understanding the Down Imaging™ Display The images you see on the Down Imaging™ display are pr oduced using sonar technology . Each time the unit pings, a strip of data repr esenting all the echoes receiv ed by the transducer ar e put together on the display to f orm the image that you see.
16 Down Imaging™ Sensitivity Use Imaging Sensitivity to control how the sonar returns appear on the display . Increase the sensitivity to re veal w eaker r eturns that ma y be of interest, especially in very clear wa ter or greater depths.
V iews The s on a r i nf or m at io n f ro m yo ur F is h f in d er i s displaye d on your screen in a v ariety of easy-to-r ead views. There are many views availabl e on your Fishfinder . • Default Vie w: W hen you fir st pow er up the 345c control head, Sonar Vie w will be the default vie w .
18 T o customize your view r otation: Y ou can choose which views are hidden or visible in your view r otation. 1. Press the MENU ke y twice to access the tabbed Main Menu, then press the RIGHT Cursor k ey until the Setup tab is selected.
Sonar V iew Sonar Vie w presents a historical log of sonar r eturns. T he most recent sonar returns are charted on the right side of the displa y . As new informa tion is received, the historical informa tion scrolls left acr oss the display .
20 Sonar Zoom V iew Sonar Zoom View pr ovides a magnified view of the bottom and structure. T he Sonar Zoom Vie w makes it easier to see separ ate sonar r eturns that w ould usually be displayed close together , such as those caused by fish suspended close to the bottom or within structure.
Split Sonar V iew Split Sonar V iew displa ys sonar returns fr om each down beam frequency on separate sides of the screen. Y ou can use the Split Sonar View to mak e side by side comparisons between the sonar r eturns from both beams.
22 Big Digits V iew Big Digits View pr ovides digital data in a large, easy -to-see forma t. • Digital Readouts: Depth is always displa yed. Readouts for temperatur e, speed, and T riplog information are displa yed automa tically if the appropria te accessory is connected to the Fishfinder .
Down Imaging™ V iew (Down Imaging™ models only [345c DI]) Down Imaging™ Vie w uses the razor -thin, high-definition profiling beams to produce the detailed sonar data tha t you see on the display . Sonar returns are charted on the right side of the display .
24 Circular Flasher V iew Circular Flasher View pr ovides two ways to vie w sonar data in tr aditional flasher format . The vie w is controlled b y the Ice Fishing Mode menu option in the Sonar Menu T ab. • When Ice F ishing Mode is off , the Circular Flasher V iew displays Real Time Sonar (R TS™) data in a traditional flasher format.
Ice Fishing Mode: Off When Ice F ishing Mode is off , the Circular Flasher V iew displays Real T ime Sonar (RTS™) data in a tr aditional flasher forma t. • Flasher X -Press™ Menu: Pr ess the MENU ke y once in the Circular Flasher Vie w. Use the X -Press™ Menu to set the Sensitivity , Upper Range, and Lower Range.
26 Ice Fishing Mode: On When Ice F ishing Mode is on , the Circular Flasher V iew displays the sonar data in traditional flasher f ormat with additional f eatur es including Zoom and Depth Cursor .
T o activate the Depth Cursor: Use the Depth Cursor to identify depth on the flasher display . 1. Set up: Press the VIEW key r epeatedly until the Cir cular Flasher V iew is displayed on the screen. T urn on the Ice Fishing Mode (see Sonar Menu T ab ).
28 T o activate Flasher Zoom: The Zoom f eatur e displays a 2x magnified vie w of the area y ou choose on the flasher display . 1. Set up: Press the VIEW ke y repea tedly until the Circular Flasher V iew is displayed on the screen. T urn on the Ice Fishing Mode (see Sonar Menu T ab ).
Down Imaging™/Sonar Combo V iew (Down Imaging™ models only [345c DI]) Down Imaging™/Sonar Combo View sho ws traditional Sonar inf ormation on the top of the screen and Down Imaging™ so nar informatio n on the bottom. • X -Press™ Menu: Press the MENU ke y once to access the Down Imaging™ X-Pr ess™ Menu.
30 What’s on the 300 Series™ Contr ol Head Y our 300 Series™ Fishfinder interface is easy to use. A combination of k eys and special featu res allows y ou to control what you see on the display . Refer to the followi ng illustrat ion, and see Ke y Functions for more inf ormation.
Ke y Functions Y our Fishfinder user interface consists of a set of easy-to-use k eys tha t work with various on-screen vie ws and menus to give you flexibility and control ov er your fishing experience. POWER/LIGHT Ke y The POWER/LIG HT key is used to po wer the Fishfinder on and off .
32 MENU Ke y The MENU k ey is used to access the menu system. See The Menu System for more inf ormation. • Sta rt -U p Optio ns Men u: Pr ess the M ENU k ey dur ing t he po wer up seq uen ce to v ie w th e Sta rt -Up Opt ion s me nu.
EXIT Ke y The EXIT k ey has multiple functions, which depend on the situation: • If an alarm is sounding , press the EXIT ke y to cancel the alarm. • If a menu tab is selected , press the EXIT k ey to exit the menu mode and return to the view . • If a menu is active , press the EXIT k ey to r eturn to the pre vious lev el in the menu system.
34 T he Menu System The Menu Syst em is divided into easy-to-use menu modules as f ollows: • Start-Up Options Menu: Press the MENU key during the po wer on sequence to view the Start -Up Options Menu. From the Start-Up Option s Menu, you c an choo se the followin g Fishfin der Mod es: Normal, Simulator , and System Status.
Start -Up Options Menu Press the MENU ke y during the power on sequence to view the Start -Up Options Menu, and select one of the modes described on the follo wing pages. Also, see Po wer On for additional inform ation. Normal Use Normal for on-the-w ater oper ation with a tr ansducer connected.
36 Simulator Us e Si mu la tor to l ea rn h ow to u se y our F ishf in de r bef or e tak in g y ou r bo a t on t he w a te r . T he Sim ula to r is a v ery p o w er fu l to ol t hat p r o vi de s a r an doml y -u pd ate d di sp la y whic h simu la tes o n th e w a te r op er at io n.
Self T est displays results fr om the internal diagnostic self test, including unit serial number , Printed Circuit Board (PCB) serial number , software r evision, total hour s of opera tion, and the input voltage. Accessory T est lists the accessories connected to the system.
38 X -Press™ Menu The X -Press™ Menu provides a shortcut to y our most frequently -used settings. T he options provide d on the X-Pr ess™ Menu correspond with the current view . For example, if y ou are in a Sonar Vie w and press the MENU k ey once, the Sonar X-Pr ess™ Menu will display .
Main Menu The Main Menu pr ovides the standar d set of menu options, including the settings that ar e changed less frequently . T he Main Menu is organized under the fo llowing tabs to help you find a specific menu item quickly: Alarms, Sonar , and Setup.
40 Quick Tips for the Main Menu • F r om a n y me nu o pt ion on a m en u ta b , pr es s th e EXIT k ey t o ju mp d ir ect ly to t he t op o f th e ta b. • F r om t he b ot to m of a men u ta b , p res s th e DO WN C urs or k ey to j um p di r ec tl y to t he t op of th e ta b.
User Mode (Normal or Advanced) Me nu op ti ons c an b e sim p li fie d or e xpa n de d by se tti n g y ou r Fi sh fin d er U s er M ode to N orm al o r Adv anc ed. No rma l Mo d e is t he de f a ul t set t in g whe n y ou fi r s t po we r on y ou r 300 S er ies ™ F is hfi n de r .
42 Sonar Menu T ab, Normal Mode Sonar Menu T ab, Advanced Mode Main Menu.
Sonar X -Press™ Menu (Sonar Vie ws only) The Sonar X -Press™ Menu provides a shortcut to your most freq uently-used settings. Pr ess the MENU key once while in an y of the Sonar Views to access the Sonar X-Pr ess™ Menu.
44 Sensitivity Settings: Low = 1, High = 20; Default = 10 Sensitivity controls how much detail is sho wn on the display and will adjust the sensitivity of all sonar frequencies. When oper ating in very clear wat er or greater depths, in crease the sensitivity to see weaker returns that ma y be of interest.
Upper Range (Advanced: Sonar , Split Sonar, Circular Flasher , and Big Digits Vie ws only) Settings: 0 to 990 feet or 0 to 327 meters [International Models only]; Default = 0 feet Upper Range sets the shallow est depth range tha t will be display ed on the Sonar , Split Sonar , Circular Flasher , and Big Digits Vie ws.
46 Chart Speed Se tt in gs: 1- 9, U lt ra, w he r e 1 = Sl o w , 9 = Fas t, U lt ra = Fa stes t; De fa ul t = 5 Chart Speed determines the speed at which the sonar information mo ves across the displa y , and consequently the amount of detail shown.
Bottom Range (Sonar Zoom Vie w only when Bottom Lock is On) Settings: 10 - 60 feet, 2-10 fathoms, or 3-20 meters [International Models only], Default = 15 feet Bottom Range allows you to contr ol how much of the wa ter column, measured up from the bottom, is show n in the Sonar Zoom Vie w.
48 Down Imaging™ X -Press™ Menu (Down Imaging™ V iews only [345c DI]) The D ow n I ma g i ng ™ X-P re s s™ M e n u provid es a shortcut to your most fr equently- used settings. Press the MENU k ey once while in any of the Dow n Imaging™ Vie ws to access the Down Imaging™ X -Press™ Menu.
Imaging Sensitivity Settings: Auto, 1 to 20, where Low = 1, High = 20; Default = 10 Imaging Sensitivity controls ho w the sonar returns are displa yed on the Down Imaging™ V iews. Increase the Imaging Sensitivity to re veal w eaker returns tha t may be of interest, especially in v ery clear water or gr eater depths.
50 Low er Range Set tings : Auto, 1 0 to 1 00 0 fe et , 3 to 3 30 m et er s [I nt er na ti on al Mod els onl y] ; De fa ul t = Au to Lower Range sets the deepest depth range tha t will be display ed by the unit. Auto: The Lo wer Range will be adjusted by the unit to follo w the bottom automatically .
Flasher X -Press™ Menu (Circular Flasher V iew only) The Flasher X -Press™ Menu p rov id e s a shortcut to your most frequ ently-used settings. Press the MENU k ey once while in the Cir cular Flasher Vie w to access the Flasher X-Press™ Menu.
52 Sensitivity Settings: Low = 1, High = 20; Default = 10 Sensitivity controls how much detail is sho wn on the display and will adjust the sensitivity of all sonar frequencies. When oper ating in very clear wat er or greater depths, in crease the sensitivity to see weaker returns that ma y be of interest.
Low er Range Se tt i ng s : Au t o, 1 0 to 1 0 00 f e et , 3 t o 33 0 me t er s [International Models only]; Default = Auto Lower Range sets the deepest depth r ange that will be displa yed b y the unit. Auto: The Lo wer Range will be adjusted by the unit to follow the bottom automatically .
54 Zoom Lev el (Circular Flasher V iew , Ice Fishing Mode only) Settings: 1x, 2x; Default = 1x Zoom Level sets the magnifica tion lev el for the Circular Flasher V iew when Ice Fishing Mode is turned on. W hen the Zoom Level is set to 1x, the Zoom fea ture is turned off.
Alarms Menu T ab From an y view, press the MENU key twice to access the Main Menu. The Alarms tab will be the default selection. NO TE: Wh en an ala rm i s tr igg er ed, yo u can s il en ce i t by p r es sin g an y key .
56 Depth Alarm Se tt i ng s : Of f, 1 to 1 0 0 fe e t, o r 0. 5 t o 30 m e te rs [International Models only]; Default = Off Depth Alarm sounds when the depth becomes equal to or less than the menu setting.
T emp. Alarm Se tt i ng s : Of f, 33 - 12 0 Fa hr en h ei t, 0 - 50 C e ls i us [International Models only]; Default = Off T emp. Alarm sounds when the water tempera ture detected b y the Fishfinder reaches the T emp. Alarm setting, which is either set in degrees Fahr enheit or Celsius [International Models only].
58 Sonar Menu T ab Press the MENU k ey twice to access the Main Menu and then press the RIGHT Cur sor ke y until the Sonar tab is selected. NO TE: Me nu op ti on s ca n be ex pa nd ed o r sim pl if ied by s et ti ng th e Us er M od e to Ad v an ce d or No rm al .
Beam Select Settings: DualBeam PLUS™: 200/83 kHz, 200 kHz, 83 kHz; Down Imaging™: 200 kHz, 455 kHz; Default = 200 kHz Beam Select sets which sonar returns from the tr ansducer will be display ed on the screen. T he av ailable beam frequencies ar e determined by your Humminbird® model.
60 The Do wn Imaging™ models (345c DI) allow you to choose 200 kHz or 455 kHz for conical sonar cover age in the traditional sonar views. • W hen set to 200 kHz , only the returns from the 200 kHz (25°) beam will be displaye d in the Down Imaging™ V iews.
61 Surface Clutter Settings: Low = 1 to High = 10; Default = 5 Surface Clutter adjusts the filter that remo ves surfa ce clutter noise caused by algae and aerat ion.
62 Fish ID+™ Settings: Off, On; Default = Off Fi sh ID+ ™ use s adv anced s ign al pr ocess ing t o int erp r et so nar r eturn s and w ill dis pla y a Fish S ymb ol wh en v er y sel ect iv e requ ir eme nt s ar e met .
Fish ID Sensitivity Settings: Low = 1, High = 10; Default = 5 Fish I D Se nsi tiv ity adjusts the threshold of the Fish ID+™ detection algorithms. Selecting a higher setting allows w eaker r eturns to be display ed as fish. This is useful f or identifying smaller fish species or baitfish.
64 Sonar Colors (Sonar Vie w , Sonar Zoom Vie w , Circular Flasher V iew , and Big Digits Vie w) Se tt i ng s : Gra y, Gree n, I nv ers e , Or i gi n al Pal e tt e , P alette 1, P alette 2, P alette 3; Default = Original P alette Sonar Colors allows y ou to select which color palette you would like to use f or the display .
Zoom Width Settings: Narrow , Medium, Wide; Default = Wide Zoom Width adjusts the width of the zoomed view on the Sonar Zoom V iew , which is on the left side of the display .
66 Depth Lines (Advanced) Settings: Off, On; Default = On Depth Lines divide the display into f our equal sections which are separ ated by three horizontal depth lines. T he depth of each line is displayed along the depth scale. Y ou can turn Depth Lines On or Off.
Max Depth (Advanced) Se tt i ng s : Au t o, 1 0 to 1 0 00 f e et , 3 t o 33 0 me t er s [International Models only]; Default = Auto Max Depth controls the maximum depth of opera tion. W hen Max Depth is set to Auto, the Fishfinder will acquir e bottom readings as needed (within the capacity of the unit).
68 Imaging Colors (Down Imaging™ V iews only [345c DI]) Settings: Blue, Amber 1, Amber 2, Brown, Gr een, Inv erse, Gray , Green/Red; Default = Blue Imaging Colors allo ws you to select which color palette you w ould like to use for the Down Imaging™ displa y.
69 Setup Menu T ab From an y view, press the MENU key twice to access the tabbed Main Menu, then press the RIGHT Cursor k ey until the Setup tab is selected. NO TE: M enu o pt io ns w ill v ary de pe ndi ng o n wh ic h acc es so ri es ar e atta che d to the u ni t.
70 Units - Depth Settings: Domestic Models: Feet, Fathoms; International Models: Meters; Default = Feet/Meter s Units - Depth selects the units of measure for all depth-related r eadouts.
User Mode Settings: Normal, Advanced; Default = Normal User Mode sets the menu system to Normal or Advanced. W hen set to Normal (default setting), the basic set of menu options ar e shown in the menu system. When set to Adv anced, additional menu options are added to the menu system.
72 Select V iews (Advanced) Settings: V isible, Hidden, Default = V isible Select Views a llo ws y ou to se t the a v ai la bl e vi e ws t o hi dd en o r visi bl e in t he v iew r ota ti on.
Depth Offset (Advanced) Settings: - 10.0 to +10 .0 feet, or -3 .0 to 3.0 mete rs [International Models only]; Default = 0 feet Depth Offset will adjust the digital depth readout to indicate depth fr om the waterline or boa t's keel.
74 Digits F ormat (Advanced) Se tt i ng s : Sm a ll t en t hs , L ar g e te n th s, N o t en t hs , Default = Small tenths Digits Format adds a tenth decimal place to the readouts such as T emperatur e and Depth. Use the settings to change the display of the decimal place or remov e it from the digital readouts.
T roubleshooting Before contacting the Humminbir d® Customer Resource Center , please read the followi ng section. T aking the time to review these tr oubleshooting guidelines may allow y ou to solve a perf ormance problem your self , and theref ore a void sending your unit back for r epair .
76 Display Pr oblems Ther e are sever al main conditions or sources of possible interf erence tha t may cause problems with the quality of the inf ormation displa yed on the control head.
Finding the Cause of Noise Electrical noise usually affects the displa y with many black dots a t high speeds, and high sensitivity readings. One or more of the f ollowing sour ces can cause noise or .
78 300 Series™ Fishfinder Accessories Accessories customize the Humminbird® F ishfinder to your needs and enable you to stay on the edge of ne w technology . When an accessory is connected to the Humminbird® Fishfinder , additional menus and readouts are added automatically to the Main Menu System.
345c Specifications Depth Capability .................................... 1 0 0 0f t( 3 3 0m ) P ow er Output .................................... 3 0 0W a t t s ( R M S ) , 2400 W atts (P eak to P eak) Operating Fr equency . . . . . . . . . . . . . 200 kHz and 83 kHz (DualBeam PLUS ™ ) Area of Cov erage .
80 345c DI Specifications Depth Capability . . . . . . . . . . . . . . . . . . . . . . . . 250 ft (76 m) Down Imaging™ 600 ft (183 m) traditional sonar P ow er Output .................................... 3 0 0 W a t t s ( R M S ) , 2400 W atts (P eak to P eak) Operating Frequency .
Gl oss ary Sonar T erms: Be am ( So na r Beam ) T he w id e, c on e- sh ap ed p r oj ec ti on of s ou nd w av es f orme d as s ou nd tr a v el s un de rw ate r . See C on e Angl e . Bo tt om C on tour Th e pr ofil e of t he b ot to m gr aphe d to t he d is pl ay a s the de pt h cha nges .
82 Gr ays ca le Th e use of v aryi ng s ha de s of gr ay to r epr es en t th e st r en gt h of t he s on ar s ig na l on th e disp la y . T rad itio na ll y , the s tr onge st s on ar s ig na ls ar e rep r es en te d in b la ck , an d pr og r es si v el y w ea ke r sign al s ar e r ep r es en te d in p r og re ssiv ely lig hter sh ades o f gr a y .
SO NA R (SO und an d NA vi gati on Rang ing) S on ar t ec hn ol og y us es p re cisi on so und bu rs ts t r an sm it te d un de rw ate r to d ete rmin e th e dis tanc e and o ther a tt ri bu te s of o bj ec ts i n th e wa ter .
84 T herm oc li nes W at er l ay er(s ) of dist inct ly di ffer ent te mper a tu r es t ha t cre a te a s on ar re flec tio n due to t he d en si ty of t he dif f er ing w ate r te mp er atu r es .
Contact Humminbird® Contact the Humminbird® Customer Resour ce Center in any of the f ollowing w ays: By T elephone: (Monday - F riday 8:00 a.m. to 4:30 p.m. Centr al Standard T ime): 1-800-633-1468 By e-mail: (typically we r espond to your e-mail within three business da ys): service@humminbird.
An important point after buying a device Humminbird 345c (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Humminbird 345c yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Humminbird 345c - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Humminbird 345c you will learn all the available features of the product, as well as information on its operation. The information that you get Humminbird 345c will certainly help you make a decision on the purchase.
If you already are a holder of Humminbird 345c, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Humminbird 345c.
However, one of the most important roles played by the user manual is to help in solving problems with Humminbird 345c. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Humminbird 345c along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
