Reddit mentions: The best fish finders & depth finders
We found 30 Reddit comments discussing the best fish finders & depth finders. We ran sentiment analysis on each of these comments to determine how redditors feel about different products. We found 18 products and ranked them based on the amount of positive reactions they received. Here are the top 20.
1. Garmin Striker 4cv with Transducer, 4" GPS Fishfinder with CHIRP Traditional and ClearVu Scanning Sonar Transducer and Built In Quickdraw Contours Mapping Software
- Includes transducer for built in Garmin CHIRP traditional sonar plus CHIRP ClearVü scanning sonar
- Built in Garmin Quickdraw Contours mapping software lets you create and store maps with 1’ contours for up to 2 million acres
- Built in GPS lets you mark waypoints, create routes and view boat’s speed
- Bright, sunlight readable 4.3” display and intuitive user interface
- Rugged design for every fishing environment.Transmit power:300 W (RMS)
Features:
Specs:
Height | 6.9 Inches |
Length | 3.9 Inches |
Number of items | 1 |
Size | 4" |
Weight | 0.7 Pounds |
Width | 1.8 Inches |
2. Vexilar SP100 SonarPhone with Transducer Pod
with Transducer PodProvided by VexilarUnderwater Cameras
Specs:
Height | 7.25 Inches |
Length | 5.75 Inches |
Number of items | 1 |
Size | One Size |
Weight | 0.881849048 Pounds |
Width | 3.75 Inches |
3. Crinkles - 1.5 lb, Forest
Exciting color blends ? Make habitats and playtime more fun with 3 colorful options- confetti, forest and mardi grassSafe for pets and families ? Non-toxic, low dust, and colors will not run or stainAbsorbent ? Absorbs its weight in liquids to keep your pet comfy and dry; helps remove natural oils f...
Specs:
Height | 12 Inches |
Length | 18 Inches |
Size | 1.5 lb |
Weight | 1.5 Pounds |
Width | 4 Inches |
4. Humminbird 410190-1 Helix 5 Series Sonar G2 Fishfinder System, 4000 Watts
- 5" widescreen display
- Features DualBeam PLUS and SwitchFire
- SwitchFire Sonar: Take command of how your sonar returns appear. With two display modes, you can add or remove detail, account for water depth, temperature and turbulence, even watch lure presentations - all at the push of a button
- Dual Beam PLUS Sonar: Two beams combine for great detail and a generous coverage area, helping you identify fish, structure and contours. Use the narrow beam for high-accuracy returns of fish, structure, detail and the bottom profile. Opt for the wide beam when you want a larger search area. You can view the beams separately, side-by-side or blended together for the complete picture. Your coverage area will be equal to your depth
- 1-Year Limited Warranty
Features:
Specs:
Color | Black |
Height | 4.28 Inches |
Length | 1.13 Inches |
Number of items | 1 |
Weight | 2.6014546916 Pounds |
Width | 7.55 Inches |
5. Humminbird 410210-1 HELIX 5 CHIRP GPS G2 Fish finder
- 5-Inch Color WVGA Display
- CHIRP Dual Beam PLUS Sonar. Power Output RMS : 500 Watts. Power Draw : 615 mA
- Precision Internal GPS Chart plotting with built-in Anima cartography
- Micro SD card slot for optional maps or for saving waypoints
- Target Separation - 2.5 Inches
Features:
Specs:
Color | Black |
Height | 4.28 Inches |
Length | 1.13 Inches |
Number of items | 1 |
Release date | January 2018 |
Weight | 2.5 Pounds |
Width | 7.55 Inches |
6. Lowrance 000-12636-001 Hook-3X DSI Sonar, W/455/800 XDCR
- Led-backlit color display with detailed 320 x 240 resolution that's easy to see in full sunlight & from wide viewing angles
- Downscan imaging view with dual-frequency 455 or 800kHz operation reveals easy-to-understand, underwater detail of fish-holding structure
- Patented downscan imaging transducer design can track bottom up to 55Mph
- Pages button allows user to quickly switch between 455kHz & 800 kHz sonar frequency options
- Dedicated quick keys allow user to zoom up to 4x the Standard view & focus on key fishing areas
Features:
Specs:
Height | 6.5 Inches |
Length | 3.75 Inches |
Number of items | 1 |
Size | 3.5 |
Weight | 2 Pounds |
Width | 1.85 Inches |
7. Vexilar SP200 T-Box Smartphone Fish Finder, Black
- Carries a two year warranty
- One year battery warranty
- Pre-drilled holes for optional accessories
- Easy access semi-enclosed battery compartment
- Pre-tapped transducer support eye bolt hole
Features:
Specs:
Color | Black |
Height | 5.75 Inches |
Length | 7.25 Inches |
Number of items | 1 |
Weight | 1 Pounds |
Width | 3.75 Inches |
8. Deeper Flexible Arm Mount 1.0 – Easily mount Deeper PRO-series Fish Finder to Kayak / Boat in secs
- Easy, fast installation and quick release clamp
- High strength materials ensure product longevity
- Suitable for marine environments
- 50cm (20") aluminum rod can be easily bent and repositioned
- Compatible with RAM mounts and most paddle sport tracks
Features:
Specs:
Color | Black |
Height | 8.27 Inches |
Length | 10.63 Inches |
Number of items | 1 |
Weight | 0.70106999316 Pounds |
Width | 1.57 Inches |
9. Humminbird 7700281 GCBK CSB GP1272 Portable AGM Battery and Charger-Color may vary
- Works with 343c Portable and 383c Portable units
- Rechargeable AGM battery with charger for portable Humming bird units
- One year limited warranty
- AGM is a type of lead acid battery
Features:
Specs:
Color | Black |
Height | 6.65 Inches |
Length | 3.1 Inches |
Number of items | 1 |
Weight | 6 Pounds |
Width | 12.35 Inches |
10. Garmin 010-01550-00 Striker 4 with Transducer, 3.5" GPS Fishfinder with Chirp Traditional Transducer
- Clear Vu scanning Sonar shows you more of what is in the water around your boat; This high frequency sonar gives near photographic images with detailed representations of objects, structure and fish
- The power of simple offers a keyed interface with dedicated buttons; The device is easy to use and easy to install; Available in 3.5, 5 and 7 inch display sizes; Water rating IPX7
- Waypoint map: Use the way point map to easily view, mark and navigate to locations such as brush piles, stumps and docks; Maximum depth 1,600 feet freshwater, 750 feet saltwater; Current draw at 12 volt: 0.23 Ampere
- Chirp Sonar sends a continuous sweep of frequencies which provides a wider range of information; Chirp Sonar is able to create crisper fish arches with better target separation
- Built in flasher: View your sonar data in the classic flasher format; Ideal for ice fishing or vertical jigging. Display size: 1.9 x 2.9 inches (4.9 x 7.3 centimeter); 3.5 inches diagonal (8.7 centimeter)
Features:
Specs:
Color | BLACK |
Height | 5.9 Inches |
Length | 3.6 Inches |
Number of items | 1 |
Release date | December 2015 |
Size | 3.5 |
Weight | 0.5 Pounds |
Width | 1.6 Inches |
11. Deeper PRO+ Smart Sonar - GPS Portable Wireless Wi-Fi Fish Finder for Shore and Ice Fishing, Black, 2.55" (DP1H10S10)
- HIGH SPECS AND ROCK SOLID CONNECTIVITY: Casts out up to 330ft and scans down to 260ft. Precise 0.5in target separation. Compatible with iOS and Android devices. Syncs to phone/tablet using its own Wi-Fi (like a hotspot). No internet or cellular data needed.
- BUILT-IN GPS: Create bathymetric maps from the bank, boat, canoe, kayak. Access all your scans, maps, points of interests, photos and notes on the Fish Deeper app and web platform.
- REAL-TIME DATA: Two beam frequencies with 15 scans per second. View depth, see bottom structure and consistency, vegetation and fish.
- BOAT AND KAYAK FISHING: Deeper Pro Plus fish finder is a great addition to your boat or kayak accessories. Installs in seconds, no cables, wires, or external batteries needed. No drilling required.
- RECHARGABLE BATTERY: Charge it as needed with a micro USB B type cable. Included in the box.
Features:
Specs:
Color | Black |
Height | 2.95 Inches |
Length | 5.9 Inches |
Number of items | 1 |
Release date | May 2016 |
Size | 2.55" |
Weight | 0.220462262 Pounds |
Width | 5.32 Inches |
12. ReelSonar CGG-MY-IBOBBER iBobber Wireless Bluetooth Smart Fish Finder for iOS and Android devices,Classic,Small
- Patented sonar fish identifier technology
- LED beacon
- Rechargeable battery and charge status indicator light
- 10+ hrs battery life.Syncs with iOS (Apple) 10.0 and later operating systems and Android 4.3 or later that use Bluetooth Smart (4.0)
- Accurate sonar readings down to a depth of 135'
- 2 Snap swivel connections for use as bobber or as remote fish finder
- Free app on iOS and Android
- Bluetooth Smart sync up to a distance of 100' for best battery life on the market
- Choose between raw sonar or fish tagging views
- Depth-tagged fish icons color coded by size
- Waterbed and structure contour mapping
- GPS spot tagging with interactive map
- Trip Log with date, time, location, water temp, conditions, type of fishing, lure, number and species of fish caught
- Lunar calendar and weather (temp, rain, wind, barometer)
- Fish & strike alarms
- Optional social media share features
- Trip and spot logging, weather, and lunar calendar app functions available w/o iBobber hardware
- Compatible with Google Watch and iWatch
- Refer to the manual below under the product description for more product use information, installation instructions and troubleshooting steps.
Features:
Specs:
Color | Classic |
Height | 1 Inches |
Length | 2 Inches |
Release date | January 2015 |
Size | Small |
Weight | 9.92080179E-5 Pounds |
Width | 2 Inches |
13. Lowrance 000-12641-001 Hook-4X Sonar W/Mid/Hi/DownScan XDCR
High-resolution, 4 inch color displayCHIRP sonar plus downscan imaging the power of today's leading fish finder technologies combined to provide the best possible view beneath boatDownscan overlay Technology Overlays downscan imaging onto chirp sonarAdvanced signal processing (asp) reduces need to m...
Specs:
Height | 7.5 Inches |
Length | 3.8 Inches |
Number of items | 1 |
Size | 4.3 |
Weight | 3 Pounds |
Width | 2.5 Inches |
14. Raymarine Dragonfly-4DV CHIRP DownVision Sonar
- 4.3" All-weather, high-definition LED backlit display
- Optically bonded for sharp color, wide viewing angles and no internal fogging
- Award winning wide-spectrum CHIRP DownVision sonar technology for photo-like images, high-speed tracking, and better deep water resolution
- Ball and socket tilt swivel mount lets you mount Dragonfly easily on any surface
- Includes transom mount CHIRP transducer with temperature sensor
Features:
Specs:
Height | 13.779527545 Inches |
Length | 13.779527545 Inches |
Weight | 2.8 Pounds |
Width | 13.779527545 Inches |
15. Humminbird 409620-1 Helix 5 DI Fish Finder with Down-Imaging and GPS
Precision Internal GPS Chartplotting with built-in UniMap cartographyMaximize your angling experience with the Humminbird HELIX 5 DI GPS fishfinder GPS systemMicro SD card slot for optional maps or saving waypoints along with a gimbal mounting system
16. Vexilar's GP1812 FL18 Genz Pack 12Deg Ice-Ducer Combo
Country Of Origin : JapanThe Package Height Of The Product Is 8.75 InchesThe Package Length Of The Product Is 11 InchesThe Package Width Of The Package Is 9.5 Inches
Specs:
Color | Multi |
Height | 9.5 Inches |
Length | 8.75 Inches |
Number of items | 12 |
Size | One Size |
Width | 11 Inches |
17. NOCQUA Pro Power Kit Battery Pack 10.0 Ah
- STAY CONNECTED, NO MATTER WHERE YOU ARE: Compatible with Raymarine, Garmin, Lowrance, Humminbird, Action Sports Cameras, and more, our supercharged NOCQUA 10Ah Pro Power Kit is the ideal companion for any marine or outdoor adventure
- WATER-RESISTANT, SILICONE SEALED BATTERY: Developed specifically for outdoor and water sports use, our 10Ah Pro Power Kit features a silicone-sealed battery and water-tight connection port to make it completely water-resistant
- LONG-LASTING, RECHARGEABLE BATTERY SOURCE: Powered by one 12V lithium-ion battery for long-lasting power, each charging kit includes a wall outlet charger for maximum versatility
- SHORT CIRCUIT PROTECTION: Our charger automatically switches off in case of short circuit, high temperature, high voltage and deep discharge, and each kit comes with everything needed to power GPS units, Fish Finders and more
- COMPACT AND PORTABLE DESIGN: No more lugging heavy equipment around on your fishing expeditions! Our 10Ah Pro Power Kit is a travel-friendly power source for your sounder, GPS, fish finder, or other outdoor electronic
Features:
Specs:
Number of items | 1 |
Weight | 1.4 Pounds |
18. Lowrance HOOK2 4X - 4-inch Fish Finder with Bullet Skimmer Transducer, Gray, One Size
- EASY TO USE: The Lowrance HOOK2 4x Fish Finder features auto-tuning sonar and phone-like menus giving you more time to spend fishing and less time dealing with settings.
- WIDER SONAR COVERAGE: The HOOK2 4x offers a wide-angle sonar cone giving you double the coverage of traditional fish finders.
- EASY SETUP: A single transducer can be mounted on the transom, inside the hull, on the trolling motor or through a scupper hole.
- TRANSDUCER INCLUDED: The included Bullet Skimmer transducer gives you traditional 2-D sonar (fish arch) views.
Features:
Specs:
Color | Gray |
Height | 3.8 Inches |
Length | 3.3 Inches |
Number of items | 1 |
Size | One Size |
Weight | 4.5 Pounds |
Width | 6.5 Inches |
🎓 Reddit experts on fish finders & depth finders
The comments and opinions expressed on this page are written exclusively by redditors. To provide you with the most relevant data, we sourced opinions from the most knowledgeable Reddit users based the total number of upvotes and downvotes received across comments on subreddits where fish finders & depth finders are discussed. For your reference and for the sake of transparency, here are the specialists whose opinions mattered the most in our ranking.
Hi there. Congratulations on your new boys! I love Rex rats! I've been a ratty mom for over 12 years. I currently have 3 males, all dumbos, one of which is a Rex. The best advice I can give is to make sure to socialize your new babies and let them get used to you, your environment, as well as each other. (I'm glad to hear you got more than one!) Pouches are a great start for that, so you are definitely on the right track. I love playing around and interacting with my boys, but I also make sure to sit back and let them explore on their own, too.
Having a good cage is crucial. I recently got space pods and they love them! Having it be plastic instead of fabric cuts down on smell, too. I always make sure they have a bunch of things to chew on and play with. Make sure they have good bedding as well. I use recycled newspaper and crinkle paper.
Diet plays a big role. I feed my guys mostly Mazuri blocks and Oxbow with some vegetables (they love broccoli and frozen peas). I try to stay cognizant of treats, since they're mostly sugar and fat. (Males are prone to weight gain, so you gotta watch out.) Fruits work really well as a treat for training.
If you have any questions as you guys get adjusted, feel free to PM me.
(Also, sorry all the hyperlinks are to Amazon haha. It's what Google pulls up.)
Congratulations again :)
Gonna go a different route from the other guys. This isn't the exact one I have, but I'd look at Humminbird's Kayak line of fish finders instead of their ICE line or larger boat stuff.
The HELIX 5 looks like a good option at a good price: https://www.amazon.com/Humminbird-410210-1-Helix-Chirp-Finder/dp/B01M2VLBQF - or the NON-GPS Version + the Navionics App (15$ish, IIRC?) on your phone: https://www.amazon.com/Humminbird-410210-1-Helix-Chirp-Finder/dp/B01MCWIC5H?th=1
Just about any sonar you get nowadays will have a digital 'flasher' dial as one of the screen options and I've found it works just as well as a FL8/VX-1. On top of that, you can actually use it in open water because it has a normal 'sonar' just like you'd see on an open water boat.
Truth be told, I've ended up using the open water sonar more often than the flasher dial anyway. It gives you a little bit of 'history' so you can see what types of movements you were doing when you finally triggered that fish to raise up off the bottom and inspect your bait. Typically the open water sonar has a vertical column along the right side of the screen that acts exactly like a flasher would, so I just use that so I get both the flasher aspect as well as the history aspect.
You'll need to get some sort of a 'conversion kit' to make the flasher work properly for ice fishing, but that kit usually includes a carrying bag, mounting platform, etc, just like you'd get with an FL8 or similar, and shouldn't cost more than ~100$.
I use a lowrance Hook-3x DSI (https://www.amazon.ca/dp/B016QVXTOA/ref=cm_sw_r_cp_apa_8SSpzb2RCWKHN) and absolutely love it. I actually have 2, one on each kayak. It is a good size, easy to use, and the downscanning is very accurate and useful.
It's not fantastic at spotting fish, but it does pick them up often enough to be useful. Mainly though it just shows you awesome details about the structures and bottom underneath you and imo thats the most important part of finding good fishing anyways.
Quick video that shows it operating, and the basic interface modes (single-button operation):
http://www.youtube.com/watch?v=_mPij7eHOmo
I'm super happy with how well it worked on its very first test, considering how rough the polar alignment was (Polaris went behind my roof when I squatted to sight down the hinge line, so I made a educated guess at where it was). I'm currently living in the LA metro area, so light pollution here is about as bad as it gets, but at least it doesn't impact my ability to do star tests. Can't wait to head out to the desert and see what I can capture.
I posted a few months ago when I just had the mechanical components completed, and it goes into a bit more detail about the design I used [LINK]. The stepper motor is microstep-driven at 16 microsteps per full step, and 200 full steps per rotation of the drive shaft. 1 rotation of the drive shaft moves the camera platform by about 0.25 degrees. Therefore, each microstep rotates the camera platform by about 0.3 arcseconds. Step rate is approximately 50 Hz.
This past week I did all of the electronics:
The microcontroller board I'm using is a Sparkfun Arduino Pro Micro (5V, 16 MHz), which is based on the Atmel ATmega 32U4. I chose this for ease of breadboarding and the ability to program over USB.
To calibrate the mount, I used a digital angle measuring cube to record the elevated angle of the mount as a function of turns of the threaded rod driveshaft (logged 138 points with a precision of 0.1 degrees). After deriving the ideal kinematic relationship between driveshaft and mount rotation angle (an arcsin function of driveshaft rotation), I did a curve fit to the data I'd recorded. What I ultimately wanted was a function that would generate a time value for when a pulse should be sent to the stepper motor. This was accomplished by adding in a sidereal tracking rate factor (360 degrees every 23.93 hours, or 7.292 * 10^-5 rad/sec), and accounting for the conversion from microsteps to drive shaft rotation angle.
I then took the trigonometric equation and fit a 3rd-order polynomial to it for quick (~100 µs, much faster than I actually need) evaluation on the MCU, which isn't really made for hefty floating point arithmetic. The polynomial approximation theoretically will accumulate no more than 10 arcseconds of error at any time, so it should be an insignificant factor compared to polar alignment error.
Using a timer on board the microcontroller, an outer loop sequentially calculates the time when each step should be made, while an inner loop waits for that time to arrive before pulsing the motor. The outer loop then calculates the next step time, and the process repeats until the preset step limit is reached. Some additional logic provides the ability to pause and resume tracking from a button input, and also reverse and "rewind" the mount upon request, returning it to its initial state.
Here's a link to the Arduino code it's running:
https://dl.dropboxusercontent.com/u/31090145/Step_Driver.zip
And a calibration spreadsheet for tuning the mount:
https://dl.dropboxusercontent.com/u/31090145/step_cal.xlsx
I have a Vexilar Sonarphone SP200 that I've used on 2 trips so far. I connect my iphone and my samsung galaxy phones to it at the same time and they work great. You can also run Navionics GPS chartplotter / sonarmap software at the same time and make your own sonar maps and improve the public maps.
https://webapp.navionics.com/#boating@11&key=s%7Bp_GncqnV
This map of Applegate Lake had almost no detail on the right-hand creek arm's sonar map. After one pass down and back up it with Sonarphone + Navionics now the public Webapp map shows my improvements. I didn't try to cover the whole arm to get a full map, we just went down the middle and back out along the shores here and there so the detail is not as full as it should be.
https://www.amazon.com/Vexilar-SP200-T-Box-Smartphone-Finder/dp/B00CJJBMDO/ref=sr_1_2?ie=UTF8&qid=1469767946&sr=8-2&keywords=sonarphone
That is the model that requires attachment to a 12V battery. They also have a model that has a self-contained battery and is a floating unit. There is a third model that is a transducer model but also has a built in internal battery.
It seems to be a very full featured setup for much much less than a self-contained GPS / sonar / chartplotter setup and its also very versatile. You can have up to 15 people I think connected to the unit at once over Wifi so you can share it with other people on the lake if you so wish.
You can download the Sonarphone app to your phone and check it out in Demo mode to play with all the settings and see how it looks.
I highly recommend it after my 2 trips using it. We'll see how it works out in the long run.
Engel makes some nice coolers with rod holders attached. I switched to that from a crate a while ago, totally worth it. 30qt fits my yak well. https://www.engelcoolers.com/cooler-dry-boxes.html Fits tackle boxes, but can also be used for food/fish storage. You can probably find them for cheaper if you shop around.
Definitely upgrade the sonar. https://www.amazon.com/Garmin-Striker-Bbuilt-Fish-Finder/dp/B017NI17HQ/ref=sr_1_1?s=marine&ie=UTF8&qid=1521764204&sr=1-1&refinements=p_4%3AGarmin This is what I use. Affordable and accurate.
An anchor system, too. Perhaps a trolley setup for your yak. I installed one just in case, and I use it all the time. Sooooo nice to be able to post up on a good spot no matter the wind or current conditions. No fussing around, paddling after every 3 casts to stay on location.
Nice boat!
> I am looking for a sonar that does fish finding, tracks my routes with a GPS map,
Any with GPS do this. the Lowrance Hook "X" series just have a super basic white basemap with no way to upgrade. The regular Hook series has upgradable maps.
Humminbird Helix units have maps you can buy, the base map isn't bad.
> plots the bottom contour of the lakes AND while records it (update the actual GPS map).
Humminbird has Autochart Live. You need to buy their "special" SD card to actually store the data, but it does hold 8 hours in the unit without needing the card. It shows up immeditely on the unit. Autochart Live has been the most accurate one I've seen so far. It plots vegetation and bottom hardness as well (I think the Garmin/Lowrance do this as well now).
Garmin has Quickdraw that you can just use any SD card to record to. It shows straight away on the unit. If you're looking to save some dough, even the cheap models have Quickdraw.
Lowrance has Genesis Live mapping, but I don't think it's availabel on their Hook units. It does the same thing. The Hook units can upload their sonar data to the Genesis website to create maps, but I don't think it's live on the Hook ones. Maybe someone who has a Hook can let me know. I think it's only the HDS and Elite units with live mapping.
This has been great so far: http://www.amazon.com/Vexilar-SP100-SonarPhone-Transducer-Pod/dp/B00CJJBM66 I've used it a handful of times in my kayak and I have to say it was pretty awesome.
Im not affiliated with 1rod1reelfishing by any means, but i watch a ton of his stuff and hes an overall pretty good dude. He happens to be a fan of the Deeper fish finder and has made a review in the past.
see what you think of it
also if you fish on a boat instead of only on shore, they make this too!
Heres my take on kayaks, you are gonna only live once and if you buy a crap kayak its going to be harder to sell someone when its time to upgrade. So go with what fits your personality. For me, I took one look at this kayak https://bonafidekayaks.com/product/kayaks/ss107/ and new without even testing it first I was sold. I do recommend you test yours first though. Most kayak dealers have a way to do this usually. I mean if your going to seriously take up kayak fishing as a hobby and get a fish finder all that do it right. Here is my fishfinder https://www.amazon.com/gp/product/B076W2N5TH/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1 and battery setup https://dakotalithium.com/product/dakota-lithium-power-box-12v-10ah/?v=7516fd43adaa
Then do like wise and don't hold back my friend.
Deeper Smart Sonar PRO+ - GPS Portable Wireless Wi-Fi Fish Finder
https://www.amazon.com/dp/B01CQLVO5U/ref=cm_sw_r_cp_apa_q7L2BbWWVP08Y
For camping/fishing, what about fishing knives, this fish finder, or any yeti product?
For aviation, what about aviation themed whisky glasses, a model aircraft or drone, replica propellor, or a flight simulator.
There are also a lot of cool aviation themed lamps 1, 2, 3, 4
Lowrance 000-12641-001 Hook-4X Sonar W/Mid/Hi/DownScan XDCR
https://www.amazon.com/gp/product/B016QVXTS6/ref=oh_aui_detailpage_o02_s01?ie=UTF8&psc=1
ExpertPower 12V 7 Amp EXP1270 Rechargeable Lead Acid Battery
https://www.amazon.com/gp/product/B003S1RQ2S/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
Garmin 010-01550-00 Striker 4 Bbuilt-in GPS Fish Finder https://www.amazon.com/dp/B017NI17HQ/ref=cm_sw_r_taa_-L21xbR9F1EYT
Raymarine sonars will blow anything else out of the water at that price range.
http://www.raymarine.com/dragonfly/dragonfly4/
https://www.amazon.com/Raymarine-Dragonfly-4DV-CHIRP-DownVision-Sonar/dp/B00TX536KO/ref=sr_1_1?ie=UTF8&qid=1523805530&sr=8-1&keywords=dragonfly+4dv
It's not $50 but I do have a Deeper fish finder that actually uses GPS and the build in transducers to map the bottom of lakes. It stores history so that you can go back to it later.
I can use a fishfinder. This is what I found
https://www.amazon.com/Deeper-Smart-Sonar-PRO-Portable/dp/B01CQLVO5U
Consider buying or borrowing a flasher of some type. Vexilar FL-18
The 698 is part of the Core series from Humminbird that is being phased out. Cabelas was clearancing off the 688 Sonar/DI units recently at less than $300. You may still be able to find this deal at local stores.
The Helix line is the series that will be replacing the Core series. The Helix series feature color monitors. The Helix 5 is available in quite a few configurations (Sonar, Sonar/DI, Sonar GPS, etc.), and they aren't that expensive.
http://www.amazon.com/Humminbird-Helix-DI-GPS-Black/dp/B00MVYNXHK/ref=sr_1_2?ie=UTF8&qid=1453462178&sr=8-2&keywords=helix+5+di
How about a sonar phone? http://www.amazon.com/Vexilar-SP100-SonarPhone-Transducer-Pod/dp/B00CJJBM66
https://www.amazon.com/dp/B017NI17HQ/ref=cm_sw_r_other_apa_-7CnzbF69GA74
Thats the one i have, i have no complaints at all, i have transducer mounted inside of my kayak in a bit of duct seal (electrical putty). Temp reading is off by maybe a degree or so. Other than that it does everything i need it to do and then some. Plus it didnt break the bank. :)
https://www.amazon.com/NOCQUA-Power-Battery-Pack-10-0/dp/B06Y1SS49M/ref=sr_1_1?keywords=nocqua&qid=1563149459&s=gateway&sr=8-1
​
Waterproof and lasts 5-6 trips before it runs out of juice so if you forget to charge it.
Depth ONLY - round 2" gauge that goes in the dash with a transducer that mounts on the back of the boat at the water line $119 - and less likely to get stolen compared to a GPS/Fish Finding unit - Cut a hole or reuse an existing gauge slot that's not purposed or ditch a silly one you never look at and throw this in there.
Ebay: https://www.ebay.com/itm/DIGITAL-DEPTH-FINDER-MARINE-GAUGE-HUMMINGBIRD-HDR-650-WATERPROOF-CUSTOMIZABLE/382917708467
Amazon: https://www.amazon.com/Humminbird-407860-1-Digital-Discontinued-Manufacturer/dp/B00417HG3W/
Alternative - in the same price range would be a dash mount Fish Finder / Lowarance Hook Series of depth + sonar kind of item with a transducer that goes on the rear / bottom of the boat - Ebay:
https://www.ebay.com/itm/Freshwater-Fish-Finder-Saltwater-Electric-Boat-Fishing-Depth-Locator-Tracker/123733498253
Amazon: https://www.amazon.com/Lowrance-HOOK2-4X-4-inch-Finder/dp/B077PDL6GR