The echoMAP CHIRP 73dv is one of the older Garmin units that were discontinued a few years ago. Since then, several better models were released, one of the newer ones being the ECHOMAP Plus 73cv. For reference, this is the Garmin part number 010-01571-01 unit that comes with the GT22 transducer and the LakeVü HD (g2) inland maps.
Key Features and Specifications
- Display: 7″ diagonal, 800H x 480V pixel resolution, WVGA color, backlit
- Sonar: Broadband CHIRP Sonar, Dual Frequency HD-ID, CHIRP DownVü
- Frequency and Coverage (with the supplied transducer):
- 2D CHIRP Sonar: 150-240 kHz 24°/16°
- DownVü CHIRP: 425-485kHz 2° fore to aft / 50° side to side, 790-850 kHz 1° fore to aft / 30° side to side
- Max. Depth Capability:
- Freshwater: 2,300 feet (701 m)
- Saltwater: 1,100 feet (335 m)
- Transducer: GT22HW-TM (8-pin)
- Power Output: 500 Watts (RMS)
- GPS: 5Hz, Internal
- Maps: LakeVü HD
- Routes, Waypoints, Tracklog: 100; 5,000; 50,000 points (50 saved tracks)
Just like the echoMAP CHIRP 53dv, this unit comes with the LakeVü HD charts. These charts cover more than 17,000 U.S. lakes, reservoirs, and rivers with depth contours, also including various other points of interest, such as bridges, marinas, camping spots, interstates, and highways. Within this number of lakes, 13,000 are covered by HD contours. They’re somewhat similar to the ContourXD offered by the Humminbird HELIX units, but LakeVü charts actually offer a little more detail. On top of that, this unit features a Multi-Depth Range Shading, which gives you the possibility to assign up to 10 color codes to various depth ranges, in order to see a specific target depth at a glance. And lastly, via LakeVü HD you can designate a minimum depth, for maximum navigation safety or to keep in a specific depth range for trolling.
As we’ve mentioned above, this unit offers the Quickdraw Contours function, which is somewhat similar to the AutoChart Live offered by Humminbird units. This function uses the sonar depth measurements to add depth contours to your maps. In other words, if a certain body of water isn’t covered in detail by the charts of your unit, you can re-chart that particular body of water, and get the most up-to-date contours.
Evidently, the echoMAP CHIRP 73dv features a fast and accurate, 5 Hz GPS/GLONASS internal receiver. This GPS refreshes your position and movement 5 times per second, also making possible the reading of your boat’s speed. Also, this unit can save up to 5,000 waypoints, and 100 routes. It also has a trail recording function, allowing you to save 50,000 track points and up to 50 tracks. Evidently, you can convert tracks into routes, add waypoints to them and retrace them.
In terms of navigation, this unit is compatible with various other charts, such as BlueChart g2, or BlueChart g2 Vision or LakeVü HD Ultra. These last two chart packs also make available the Enhanced Auto Guidance function, which instantly searches through your charts to offer the safest virtual paths between two points of interest. It also gives you the possibility to calculate arrival times, or in case you’re using a Garmin autopilot system, it can follow a safe Auto Guidance route.
Transducer and sonar functions
As the name of the unit suggests, the echoMAP CHIRP 73dv features CHIRP sonar technology. It can actually use CHIRP for both its 2D sonar and DownVü. With the supplied GT22HW-TM (8-pin) transducer, it can use a pulse modulation between 150-240 kHz for 2D, and 425-485 kHz / 790-850 kHz for DownVü. Differently put, you can only use High CHIRP mode for 2D, but you have two CHIRP modes for the down view sonar.
On the other hand, the unit is capable of the following frequencies: 50/77/200 kHz for 2D, and 260/455/800 kHz. Thus, if you’re not going to use the CHIRP modes, with this transducer, you’ll be able to use the 200 kHz frequency for 2D and 455/800 kHz for Dv. However, just like the older model, echoMAP 73dv, this unit is dual-frequency capable. So if you’re going to use a 50/200 kHz transducer, or 77/200 kHz transducer (8-pin connector or adapter required), you’ll be able to use both these frequencies simultaneously.
For DownVü, the transducer uses thin, fan-shaped beams, at angles of approx. 50° for 455 kHz, and 30° for 800 kHz. Evidently, the down view sonar is best to be used when looking at structure shapes and when looking for places where fish might be hiding. Also, with the power of CHIRP, images are crispier, with less clutter, offering a superior clarity for the vegetation, bottom and structure contours.
On the other hand, for 2D the transducer uses conical beams, varying between 24° and 16°. And since it can use CHIRP, you will benefit from a superior target separation and a better focus on the fish targets.
The optimal boat speed recommended for the best images for both 2D and DV is between 1-6 MPH, even though the unit should be able to maintain a bottom reading at speeds up to 30 MPH.
The GT22HW-TM (8-pin) transducer supplied with the Garmin 010-01571-01 unit integrates a temperature sensor, so the unit is capable to track water temperature. It also features a temperature graph function. The transducer comes with a transom mount and 20′ (6 m) of cable.
This unit offers several useful, sonar-related functions, including Fish Symbol ID, Sonar Recording and Sonar History Rewind, Flasher, Bottom Lock and more.
One last important aspect to be mentioned here regards the Panoptix compatibility. Panoptix is one of the hottest sonar technologies that you can find at the moment. It gives you the possibility to see live images of the underwater activity, to actually view your lure moving and fish attacking it in real-time. A Panoptix LiveVü transducer is not supplied with this unit, so Panoptix sonar is not available for use right out of the box unless you order the Panoptix custom transducer.
Control unit features and functions
To begin with, the echoMAP CHIRP 73dv is IPX7 waterproof. This means it can withstand incidental water exposure such as splashes, rain or even immersions, with no problem. The unit features a unified connector with multiple pins, and connects to the quick-release mount, while the mount features all the other connectors for NMEA 2000, power, Panoptix and transducer. NMEA 0183 connection is possible with an adapter cable. Also, the unit features a microSD card reader, with one card slot.
This unit is equipped with a 7-inch display, WVGA color, with LED backlight, for enhanced readability in direct sunlight or during night fishing. With a pixel resolution of 800 x 480, you get plenty of screen space for various split-screen views.
This unit supports Minn Kota and MotorGuide trolling motors with integrated transducers and offers readings for various motor parameters.
A flush mount and unit cover are also supplied with this unit.
- CHIRP technology offering superior clarity, target separation and target definition, for both 2D and DownVü;
- Dual-frequency sonar;
- Transducer (GT22HW-TM, 8-pin) included;
- Panoptix sonar compatible;
- Data graphs and other sonar functions;
- Sonar recording and rewind;
- Fast and accurate internal GPS;
- Preloaded with LakeVü charts;
- Quickdraw Contours function, for the possibility to add contours and customize your maps;
- Multiple Depth Range Shading;
- Compatible with various other chart types, such as BlueChart g2 Vision or LakeVü HD Ultra;
- Enhanced Auto Guidance capable;
- Tide tables information;
- Supports AIS and DSC-capable VHF radio;
- Quick disconnection (tilt-swivel) and flush mount included;
- Unit cover included;
- Easy to install;
- Straightforward, comprehensive operation.
- The manual covers all the echoMAP CHIRP series (at least for now), and some of the information in it may not apply.
The Garmin echoMAP CHIRP 73dv is a mid-range sonar and GPS combo, offering superior sonar technologies, such as CHIRP sonar and CHIRP DownVü, including Panoptix sonar capabilities. It comes with the LakeVü HD charts which offer a lot of detail and on top of that, it has the new Quickdraw Contours function which allows you to define the contours of the body of water where you’re fishing. It’s a unit with a lot of potential, great for just about any type of boat, except maybe for small kayaks or canoes. And finally, since it includes a pretty expensive transducer, and a wide array of features, functions, and capabilities, it’s definitely a package that worth the price.