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Garmin 140 fish finder

I bought this as my first ever fish finder, and as a starter unit it comes highly recommended. It's a basic grey scale unit, one level up from the black and white display on the smaller Garmin 90.

The screen size is a quite adequate 3" x 3", often, and confusingly, referred to as a 5 inch screen because it measures 4.7" on the diagonal.

In use the unit is rated as drawing 0.5A, but in practice I found this to be a maximum, and a 3.2Ah battery was more than adequate for this unit, giving around 10 hours of continuous use.

The screen has just 128 x  240 pixels, quite low by today's standards, so the display can appear a bit blocky at times, but I found it more than adequate for finding drops offs and other sub surface features, as well as giving a large, clear, readout of the depth. The transducer can also pick up the water temperature. In use the unit lived up to its IPx7 rating, and survived more than its fair share of dunkings. The copper terminals on the rear of the unit, and those of the matching plug, do tend to go green with age, however if sprayed with ACF-50 this cures the problem and my unit is still going strong in its fourth season. Unusually for a budget unit, it comes with a dual frequency transducer, which enables it to work well in both deep and shallow water, and provide a decent quantity of detail. The unit comes with a tilt and swivel mount, which attaches to a round base plate that is fixed to the kayak by three bolts. To remove the unit you undo a knurled knob and it comes away complete with bracket. Don't be tempted to put the knob back into the base plate during transit, as my first one worked free somewhere along the M4.

Various user settings are available, and fish can be displayed as either conventional 'arches', or as fish symbols, truth be told, I'm not sure how many fish I every found with unit, and used it far more for looking for features on the bottom.

The unit pictured has its transducer mounted on a swinging arm, but in use I tended to forget to bring the arm in before landing, and crunched it into the beach a few times. As a result, I removed the arm, and Sikaflexed the transducer into the hull of my Tarpon 120, interestingly there didn't appear to be any difference in the performance of the unit with the transducer mounted inside the hull.

The unit has recently been discontinued and as a result can be found at bargain prices if you shop around.

Be aware that this unit comes with a relatively large plug, and as such, you'll have to drill a 22mm hole in your kayak in order for it to pass through, and it will require an oversize cable gland to seal it up as well.

Recommended book

Discover Kayak Fishing
by Andy Benham

Purchase online!