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Comparison Garmin Striker 7sv vs Garmin Striker 7dv

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Garmin Striker 7sv
Garmin Striker 7dv
Garmin Striker 7svGarmin Striker 7dv
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Typefish finderfish finder-chartplotter
Specs
Scan depth700 m700 m
Number of beams of radiation22
Number of frequencies66
Emitter power500 W500 W
CHIRP Technology
Side scan
Bottom scan
Display specs
Display
7 "
800x480 px
colour
backlight
7 "
800x480 px
colour
backlight
Features
Functions
Sound alarm
Determination of the distance to the fish
Indication of symbols in the form of fish
Real time fish display
Quick screen update
Auto-change depth scale
Depth display range
Bottom density determination
Water temperature indicator
Speed indication
Distance display
Sound alarm
Determination of the distance to the fish
Indication of symbols in the form of fish
Real time fish display
Quick screen update
Auto-change depth scale
Depth display range
Bottom density determination
Water temperature indicator
Speed indication
Distance display
Specs of the chartplotter
GPS module
General
Dust and water protection
 /IPX7/
 /IPX7/
Dimensions235x140x58 mm235x140x58 mm
Weight680 g680 g
Added to E-Catalognovember 2016april 2016

Type

The type defines the general purpose of the device.

Echo sounder. Echo sounders are devices designed to study water bodies using sonar. The principle of operation of an echo sounder is similar to that of a radar, but it does not use radio waves, but ultrasound. The initial purpose of such devices is the creation of topographic maps of the bottom of a reservoir, the determination of its topography and depth in various places. However, in addition to this, the echo sounder can be used to detect fish, and with good quality of the device and correctly set settings, you can even determine the approximate size of potential prey.

Chartplotter. A chartplotter can be described as a dedicated GPS navigator designed for marine use and equipped with related additional features. Such functions include, at a minimum, working with sailing directions (detailed maps of water bodies, indicating depths, currents, etc.); in addition, support for meteorological services, additional equipment such as radars or specific navigation sensors, etc. can be provided. Note that the GPS receiver can be either built-in or external; see Chartplotter Specifications for details.

Sonar chart plotter. Models that combine the capabilities of both types described above in one device. Such devices are the most versatile, however, and cost accordingly.

— Sonar fl...asher. A specific type of echo sounder, designed specifically for use in one place, without movement. Initially, such devices were generally developed for fishing from an ice hole in winter — although this is not limited to such fishing — flashers are also used in summer, including in open water when fishing from a boat. Such devices are by definition capable of displaying fish in real time (see "Functions"), however, instead of a traditional screen, a circular indicator is used, thanks to which the user can determine the direction of the detected object. And the features of this object (more precisely, the signal reflected from it) can be determined by the colour of the mark on the indicator: for example, a red mark corresponds to a strong signal, yellow to an average signal, green to a weak one. Another advantage of a flasher over a traditional fish finder is its high sensitivity, which allows you to follow even small baits. Thanks to all this, such devices are quite popular among anglers, however, they are not cheap.

CHIRP Technology

Sonar support for CHIRP technology.

The meaning of this technology is to use the echo sounder at the same time several frequencies. In other words, each pulse consists of several signals, each at its own frequency. According to the creators, this allows you to improve image quality, increase detail (including at great depth and high speed) and at the same time reduce the level of noise and other interference on the screen compared to single-frequency sonars. However, models with CHIRP are noticeably more expensive.

Side scan

Availability of the side scan function in the echo sounder.

Devices with this feature are able to "see" the bottom and underwater objects not only directly under the vessel, but also on the sides of it. Note that different models can differ markedly in the angle of coverage of the side space. However, the side scan anyway expands the capabilities of the echo sounder and provides additional features compared to the usual bottom one.

GPS module

The presence of a native GPS satellite navigation module in a device with a chartplotter function (see “Type”). This module is responsible for determining the current geographic coordinates of the device and is thus a key element required for effective work with maps. At the same time, there are chartplotters that do not have this function — they are designed to connect an external GPS receiver.
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