[Main](/) ❯ [Navigation & tracking systems](/navigation_and_tracking_systems_en) ❯ **RedBase: Device specification**
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| [www.unavlab.com](https://www.unavlab.com/)
[support@unavlab.com](mailto:support@unavlab.com) | **RedBase** - GNSS-equipped sonobuoy
Device specification |
## KEY FEATURES
* **High-performance combined GPS/GLONASS receiver**
* **Rugged, durable, easily noticeable housing**
* **Simultaneous positioning for an unlimited number of [RedNode](RedNODE_Specification_en.md)/[RedNav](RedNAV_Specification_en.md) devices**
* **Long battery life of up to 24 hours**
* **Reliable and noise-resistant digital broadband underwater acoustic communication technology**
## DESCRIPTION
The **RedBase** GNSS-equipped sonobuoy, in a set of four such devices, forms a floating long navigation base,
which supports the simultaneous positioning of an unlimited[*](#footnote_a1) number of [RedNode](RedNODE_Specification_en.md)/[RedNav](RedNAV_Specification_en.md) navigation receivers.
The device is made in the form of a plastic cylinder measuring Ø150x600 mm, with an underwater acoustic transmitting transducer on a cable.
It has positive buoyancy and a load-bearing eye for attaching an anchor.
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* Patents US10989815B2, WO2017044012A1, EP3349040A4, RU2599902C1.
## TECHNICAL SPECIFICATIONS
| PARAMETER | VALUE |
| :--- | :--- |
| DIMENSIONS (Ø x h) | 146 x 597 mm |
| WEIGHT (dry) | 4.8 kg |
| EXCESS BUOYANCY | 1 kg |
| CARRIER FREQUENCY | 20100 Hz |
| MAXIMUM BATTERY LIFE | 24 hours |
| MAXIMUM ACOUSTIC COMMUNICATION RANGE[1](#footnote1) | 3000 m |
| MAXIMUM ACOUSTIC SOURCE LEVEL | 170 dB re 1 μPa @ 1 m |
| MAXIMUM PERMISSIBLE DISTANCE TO OTHER BUOYS OF THE SET[2](#footnote2),[3](#footnote3) | 700 m |
| MINIMUM PERMISSIBLE DISTANCE TO OTHER BUOYS OF THE SET[3](#footnote3) | 30 m |
| MAXIMUM VELOCITY RELATIVE TO RECEIVERS | +/- 1.8 m/s |
| OPERATING TEMPERATURE RANGE | -10 .. 50 °C |
| REFERENCE ELLIPSOID | WGS-84 |
| BUILT-IN BATTERY TYPE | Lead-acid |
| BUILT-IN BATTERY CAPACITY | 48 W·h |
| UNDERWATER ACOUSTIC TRANSMITTER CABLE LENGTH | 1.1 m |
| FULL CHARGE TIME FROM 220 V / 50 Hz MAINS | 10 h |
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1 A parameter that determines the maximum range at which signal reception is possible, based on the electro-acoustic parameters of the transmitter and receiver, the spatial decrease in the intensity of sound energy, attenuation in the medium and the acoustic noise level.
2 The buoys are placed on the water surface in a convex polygon so that the distance from each buoy to any other does not exceed the specified value.
3 The immersion depth of the navigation receivers must not exceed the dimensions of the navigation base.