Popular Castable and Portable Fish Finder

The market of small boats now is flooded with tiny paddleboards, kayaks, tiny skiffs assisted by the active development of tablet and smartphone applications. Additionally, there are also awesome marine electronics devices available. In recent months, there has been a strong growth in deeper smart portable fish finder that can transmit key information into devices like Androids or iPhones.

But before that, Humminbird was the manufacturer that had made SmartCast, the most popular castable products in the market. It had a rod-/wrist- mount display. But now anglers can decide between products from SonarPhone, iBobber, FishHunter, Deeper with price in the range of $90 to $220.

Castable units could provide all types of functions like weather reports, solunar information, fish database and fishing logging beside sonar thank the app user interface. They also have additional features like location saving and social sharing.

But castable products have some limitations because of the size of them, especially in the saltwater use. If you want to have better signal strength, improved rough condition capability, and more functions, you could try bigger portable sounders or GPS/sounder combo. Below are some quick reviews of some currently available products.

Castable Finder Products

They work just as like their name: you put them in the fishing line end and toss or cast them into the chosen location. It could be also towed behind a boat slowly. These products work once they touch the water surface and could float as they are waterproof.

Deeper Smart Fish Finder

This bobber-shaped and round sonar unit has a diameter of 2.6 inches and a weight of 3.5 ounces. They have several attachment points and you could cast them from different heights.

Each product has a transducer working on the dual-frequency band (90 and 290 kHz). They could censor a depth of 130 feet and works within the paired device in the range of 160 feet. They use Bluetooth as their connection technology so they are compatible with lots of devices like iPads, iPhones and tablets or smartphone having Android 2.3 or above.

They have the rechargeable battery at the voltage of 3.7V that could provide services up to seven hours. The companion application as features like satellite overlay base map, fish activity calendar, water temperature display, weather reports and fishing logs. They are available at $229.99 for each unit.


Each FishHunter units has a weight of 4 ounces, comes with an attachment point.

Their transducer work at 381 kHz and could read up to the depth of 120 feet. They also have the ability to automatically adjust the sonar signal pulse length when user change the depth ranges (30, 20 or 10 meters) for optimal result. The angle of transducer beams ranges from 22 to 16 degrees when working at 6 and 3 decibels.

They have a casting range of 80 feet and use Bluetooth to communicate with Android or iOS devices. They could bring nine hours of services on one charge with their 3.6V internal battery. Their app is free and provides the ability of mapping (not marine charts), moon forecasting, log book, water temperature, fish database. Besides that, they have the raw data display that represents like traditional sounders instead of fish icons. They cost $229 for each unit.


As of now the iBobber finders is only available for iOS devices with the Bluetooth Smart capability (low energy Bluetooth waves) but iBobber has a plan to expand them to Android 4.3. Bluetooth Smart has an advantage when they provide continuous connectivity while using much less energy from your battery than the traditional Wi-Fi or Bluetooth devices.

Each unit has a diameter of 2.3 inches, a weight of 1.7 ounces, looks just like a big freshwater bobber. Their transducers work at 118 kHz frequency, they could work in the range of 100 feet from their paired mobile devices and measure up to the depth of 135 feet.

The iBobber finders mark fish according to their size, if longer than or under 15 inches. Their free app has a lot of features and $99.99 is the price of each unit.

SonarPhone T-Pod

These finders come from the Vexilar manufacturer. Each unit weighs 4 ounces, has a transducer that has a cone of 30 degrees and working at the 125 kHz frequency. Each charge on their 3.7 V rechargeable battery will make the fish finder works for four hours.

They implement Wi-Fi instead of Bluetooth as their connection technology. They work with all the Android or iOS devices, could transmit information to a paired device within the range of 100 yards, could connect to multiple devices. They have the bandwidth of 100 Mbps and the power of 400 watts.

The companion app is free and provides a classic sonar display, you could zoom in a range in addition to other popular sounder features. Each finder costs $129.95 and could read up to the depth of 120 feet.

Portable Units

Lowrance, Humminbird, and Garmin all sell portable gears that operates with their small sonar sounders and GPS/sounder combos. Many of them come with sealed batteries and suction transducers. Vexilar has a portable TBox device that could connect to Android or iOS devices as all the castable devices.


They have three option in the portable fish finder market. The echo 151, echo 301c (cost $179.99 or $299.99) devices have a charger, rechargeable battery, suction transducer with dual beam and carrying bags. The third option is a $129.99 device that anglers could buy separately and make it a mobile echo unit.


The company offers the PiranhaMax and the new, small, widescreen Helix that have the price from $170 to $400. They are both available as GPS/sonar or sonar units.

The Fishing Buddy unit is clamped into a boat, having the sonar head on top of a tube and a transducer. Each unit costs from $130 to $270.


Their devices have sizes from 3 to 5 inches and come with tackle holders, charger, battery, bag and transducer. $249 is the price of each unit.

SonarPhone T-Box

Each T-Box is sold at $199.95, could connect to a smartphone to represent the sonar data. Their app is not free, costing up to $50 but could provide you marine charts and split screen display. Their dual-beam transducers work at 83 and 200 kHz and could read up to the depth of 240 feet.

We hope this article have help you with the features of deeper smart portable fish finder options currently available in the market.

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