Vexilar SonarPhone T-Pod, WiFi fishfinder in a bobber!

... written for Panbo by Ben Ellison and posted on Apr 15, 2014

Vexilar_SonarPhone_T-Pod_closeup_cPanbo.jpgIt's 2014 and a sealed plastic 5-inch bobber can indeed contain a fairly able 400 Watt, 125 kHz fishfinder and a WiFi radio, plus enough rechargeable battery to run both for a few hours. The SonarPhone T-Pod will strike many as a toy, but it actually works quite well considering its small size and price tag ($130). And the manufacturer Vexilar puts the same technology into models meant to install on small boats, which means that dedicated iPad (or Android tablet) boaters do indeed have a fishfinder option...


That's the SonarPhone T-Pod kit above, my iPad mini excepted. The bobber has a waterproof three-pin port that accepts a battery charge via that USB cable, and submerging the pins in water is also what turns the T-Pod on. In fact, if I'd videoed this in dimmer light you'd see that the T-Pod was glowing green and blinking because it was powered up and transmitting. (The shorter wire is used to reset the T-Pod to factory defaults, because in 2014 you might also space out the password to your fishfinder bobber ;-)


To test the T-Pod I hauled out a lovely 7-foot surf casting rig inherited from my dad, and I'd like to think I'm showing some pretty good form in the photo above. I can get the bobber at least 100 feet out on the harbor or lake (I'm getting better) and then check out what it's seeing on my Android phone in the included wrist case, either as it drifts in current or as I reel it in. The main market, of course, is fishermen who stand on bridges or banks, but there are other uses. In this case, for instance, the photographer is my friend and Wayfarer Marine dockmaster Ben Cashen, who's concerned about a possible bottom "lump" along the fuel dock. We decided to put the project off to warmer weather, but I can even picture explorers standing on their bow using a T-Pod to check out a possible, but poorly charted, anchorage.


Here's an iPad mini screen of the T-Pod in action on the iOS SonorPhone app. The menu button cycles through three menus that you can then browse and change with the big direction arrows. It works fine for me on both iPad and phone, and actually you can, at least, view the T-Pod output with both at once. One device acts as the control "master" and the other is a view-only "slave." This is fully developed software, not a toy (excellent online manual here).

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Above is a collage of three Android SonarPhone app screens. The only difference I noticed from the iOS app is the indication of WiFi strength. I didn't test Vexilar's claim of a 100 yard WiFi range, but I was pretty amazed that it worked as well as it did, even when almost submerged in wavelets. I also didn't test with real fish, which may have something to do with the 39 degree water temperature the device measured. In that first screen I had turned on both the fish symbols and depth, but what the T-Pod was actually seeing was a schooner's winter anchor line. Most any fishfinder I've tried can make that mistake. The last screen shows how nicely the app can switch from portrait to landscape mode, and also what a clean dredged harbor bottom looks like when you occasionally pull the transducer out of the water and cast it again.

This final photo shows the $150 SonarPhone T-Box SP200, designed for permanent boat mount. I haven't tried it yet, but note that it has a 200/83 kHz dual beam transducer and that the apps can purportedly switch frequencies or show the fish that are in the 40-degree wide 83 kHz beam but not in the 20-degree wide higher frequency beam. (And note that there's already a dual frequency Deeper fishfinder bobber that communicates with apps over Bluetooth and looks pretty sexy.)
In conclusion, a fisherman in a small boat might be quite happy switching between a T-Box and a charting app, as long as he or she can see their mobile device screen (a bit of shade often needed in my experience). Greater integration of WiFi fishfinder and charting apps is obviously possible -- and on my scale of boating mobile devices will be secondary for a very long time (I think) -- but hat's off to Vexilar for putting together an able, sophisticated, and reasonably priced "toy".

Vexilar_SonarPhone_T-Box kit_cPanbo.jpg


​Tom Zenanko of Vexilar says I'll be really amazed by the SonarPhone T-Box SP200 fixed model (though my neglected old outboard power catamaran "Li'l Gizmo" needs a lot of work first ;-(

Tom also reports that the SonarPhone is getting lots of interest from small boat builders and may become a standard feature in some 2015 models. He's also getting calls from marine electronics distributors around the world.

SonarPhone may be another disruptive success story involving mobile device apps, wireless comms and all the hard work it takes to develop a mature product.

Posted by: Ben E at April 16, 2014 10:37 AM | Reply

Rather than tossing out the sonar phone via a fishing line, it could be installed in, or towed by, a remote control "toy" boat. It would be an easy way to find the deep water to get yourself off a shoal or where to drop the hook!

Posted by: Paulius at April 16, 2014 11:21 AM | Reply

Paulius, the similar Deeper wireless fishfinder has a stud that can be used to mount it on a remote control boat. Pictures down the page here:

Posted by: Ben E in reply to Paulius at April 16, 2014 12:41 PM | Reply

Sonarphone has a lot more options. Add on to that the fact that it runs off wifi, not Bluetooth, you can have a lot more people connected to one unit at the same time. Apples to oranges.

Posted by: Northcountry at April 19, 2014 11:11 AM | Reply

Do you need to be connected to a wifi connection or is the tpod the wifi connection sorry I don't get it?

Posted by: Earl at June 6, 2014 11:29 PM | Reply

No worries, Earl, it's a common misunderstanding. WiFi is just a wireless communications protocol; it is not the Internet, even though many people think that an Internet connection via WiFi is WiFi.

So, yes, the T-Pod has its own WiFi transceiver (aka hotspot) which you hook up to with your phone. It will work anywhere as long is your phone is close enough to the T-Pod.

Posted by: Ben E in reply to Earl at June 7, 2014 8:46 AM | Reply

I'm considering using this for ice there a temp rating on the T-pod. Would you anticipate any problems in below zero weather?

Posted by: Jan at November 13, 2014 8:00 PM | Reply

Any word on how this thing performed ice fishing? Thanks

Posted by: Winston at February 4, 2015 7:31 PM | Reply

I have the unit and tried it ice fishing and will again should chart speed be at lowest setting

Posted by: don pidhoresky at February 20, 2015 9:41 AM | Reply

I have been reading about this unit as well. I purchased the 200 model to mount on a 17' Whaler, in conjunction with the Navionics app on a Nexus 7. Should give me a 7" MFD experience for around $350. Not too shabby. I agree that this could, if it works well, provide a very disruptive workflow for the small boat owner. Will it replace the electronics on my larger SF? No. But Im hoping it will further spur development in the future!

Posted by: Ryan Napolitano at May 5, 2015 12:02 PM | Reply

I was wondering if the display showed speed over ground or not. I was thinking about getting this for my kayak and using it on the lake or rivers that I fish. Any information would be amazing. Thanks in advance.

Posted by: Matt at June 25, 2016 12:41 PM | Reply

I already have a vexilar fish camera. I am looking at purchasing a t300 fish finder. Just wondering if they will both work at the same time on the same boat? will the WiFi signals interfere with each Other?

Posted by: Malcolm at April 16, 2017 11:55 AM | Reply

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