DEEPER COMPARISON · BUYING DECISION

Deeper CHIRP or PRO+: Which Technology Really Helps You on the Water?

Short answer: CHIRP can separate details more clearly and, depending on the model, offer multiple narrower sonar cones. A PRO Plus can still be exactly right if your main goals are finding structure and mapping. What matters is not the model name, but what you want to learn about your body of water.

Deeper CHIRP in practical use — Original image from the existing Deeper material: What matters is not the advertising claim, but what you can reliably distinguish on the display.

Important note on current informationThis comparison preserves the technical explanation from the original article but refers to earlier model generations. Deeper continues to develop its devices and app. Before buying, therefore, check current models, included equipment, app support, and prices with the manufacturer. The principles behind sonar cones, target separation, and mapping remain useful.

The old question “Is CHIRP worth it compared to PRO Plus?” was valid because it looks beyond the technical terminology. A fish finder is not good just because its frequency sounds modern. It is good if its display lets you see more quickly whether a drop-off is really there, how steeply it descends, and whether the area suits your target species and the season.

Table of contentsHow does CHIRP change the sonar display?Why are sonar cones more important than model names?When is a PRO Plus enough—and when does CHIRP help?Which device suits your target species?How do you make an honest buying decision?

How does CHIRP change the Deeper sonar display?

Short answer: CHIRP uses a range of frequencies instead of a single fixed frequency. This can improve the separation of closely spaced echoes and the display of small structures. But it cannot create information from a poor angle, an unsteady retrieve, or an overly wide cone.

The original course excerpt explained the ping: The device transmits sound, receives the echo, and uses it to build an image step by step. CHIRP analyzes a range of frequencies. In practical terms, this can make it easier to distinguish the bottom, vegetation, baitfish schools, and individual echoes. It can make a difference especially around steep drop-offs, small plateaus, or closely spaced signals.

The limitation is the same as with any sonar: The device sees only what lies within the cone. If you retrieve too quickly, cross a drop-off at an angle, or expect a millimeter-accurate map from deep water, even a better signal will not produce a perfect model of the body of water. Only the right question and a controlled scan make the technical advantage useful.

Video in German — English version coming soon

Why are sonar cones more important to your decision than the label on the device?

Short answer: The cone determines how much water and bottom are combined in your display. Wide cones help search an area; narrow cones inspect details. That is the function you actually use on the water.

In shallow water, a wide cone can cover a large area. This is useful when you want to quickly determine where a plateau ends or where vegetation begins in a gravel pit lake. A narrow cone can inspect a promising zone more precisely: How wide is the drop-off? Is there really a ledge? Is there a small transition before the steep slope?

Diagram of different Deeper sonar cones — Original graphic: Cone width and depth determine which area is combined in a sonar display.

In practice, this means: search first, then inspect. Once you find a promising line with a wide cone, you can measure it more precisely with a narrower cone. Learn more in our guide to Deeper sonar cones.

When is a Deeper PRO Plus enough—and when does CHIRP really help?

Short answer: A PRO Plus is enough if you want to reliably find depth, drop-offs, bottom contours, and mappable structures. CHIRP is especially useful if you rely on small details, steep transitions, or signal separation and actually use that additional information while fishing.

Your question on the water	What you need for it	What you should consider
Where do the drop-off, channel, or plateau run?	A clean map and controlled casts	GPS/mapping function, repeatability, and app support
Is the transition small or steep?	A detailed display and narrower view	Cone selection, retrieve speed, and target separation
Where is the most promising zone along a new shoreline?	Search an area quickly	Wide cone, systematic grid, and waypoints
Do I want the images to help me catch more fish?	Knowledge of the water and target species	The device supports your decision; it does not replace it

For many shore anglers, mapping offers the greatest advantage: You find a transition, save it, and inspect it again during another season. By contrast, anglers who want to distinguish a few precise structures very accurately on familiar waters may benefit more from the additional target separation. There is no honest universal answer that applies to every gravel pit lake, groyne, and target species.

Which Deeper suits your target species—not just your fishing style?

Short answer: The species alone does not determine the choice; the question you want to answer about it does. For perch, a small drop-off or baitfish school may matter; for zander, the transitions between depth, current, and calm water; for pike, vegetation and shallow water; and for carp, travel routes, plateaus, and feeding areas.

When fishing for perch, closer inspection can help if you want not only to find a small plateau, drop-off, or school, but also to assess it correctly. When fishing for zander in a river, you often need the general shape first: groyne head, channel, outer edge, calm area. For pike, transitions from vegetation to open water are often more interesting than a perfect fish arch. For carp, a map and repeatable contour lines often provide more value than searching for individual echoes.

The device therefore does not need to be labeled “for zander” or “for carp.” It must reliably answer the right question about the body of water. That is exactly why, at Fischfindertest, we classify technology not as a toy but as part of a fishing plan.

How do you make an honest buying decision about a Deeper today?

Short answer: Start with your body of water and your question, not the highest number on the specification sheet. Then compare current devices by cone, mapping function, range, app, accessories, warranty, and the actual value they provide on the water.

Identify the type of water: River, gravel pit lake, canal, shore, kayak, or small boat.
Define your search question: Find an area, build a map, or inspect the details of a known structure.
Check current devices: For a new purchase, the manufacturer's website, included equipment, and app compatibility are more authoritative than an old model review.
Plan for practice: A good device becomes valuable only when you practice using the cone and map and interpreting the display.

The old comparison therefore intentionally remains online, but not as an automatic recommendation to buy an earlier model. Its value lies in the question behind the purchase: What information are you missing on the water—and does this device actually provide it?

This article retains the technical core of the existing CHIRP vs. PRO Plus video and reorganizes it: CHIRP, ping, sonar cones, target separation, and a buying decision based on actual value. Earlier model names are not presented as current buying recommendations.