SURVEYShopAltimetersImpact Subsea ISA500 Range of Altimeters

Impact Subsea ISA500 Range of Altimeters

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The ISA500 family of underwater Altimeters provide range measurement capability to the nearest 1mm with a range capability of over 120 meters.

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The ISA500 underwater Altimeter & Echo Sounder provides exceptionally long distance measurement capability – in excess of 120 meters.  In addition to providing exceptionally long range capability, the unit has a 1mm accuracy – allowing precision underwater distance measurements to be made.

Optionally, the ISA500 can also be provided with an integrated Attitude and Heading Reference System (AHRS).  This provides highly stable Heading, Pitch and Roll readings.

Altitude & Echo Sounding

The ISA500 utilises sonar technology to derive distance measurement.

Operating by default at 500kHz, the unit utilises a broadband composite transducer and electronics together with an advanced digital acoustic engine.  The combination of these enable the unit to achieve long range and high accuracy.

The unit can be operated at any frequency from 400 to 600kHz – ideal for different applications or operating in conjunction with other hydro-acoustic or sonar equipment.

With first return, strongest return and seabed tracking modes, the ISA500 can be configured to suit specific applications. 

Attitude & Heading Reference System (AHRS)

Optionally available on the ISA500 is an integrated Attitude & Heading Reference System (AHRS) providing Heading, Pitch & Roll.

The AHRS is based on Micro-Electrical-Mechanical-System (MEMS) based technology.

Within the ISA500 there are three MEMS based Gyros, Accelerometers & Magnetometers.  The outputs from each of these MEMS devices are fused together, providing highly stable Heading, Pitch & Roll.

The Heading is highly resilient against temporary magnetic interferes.  This is aided by a soft and hard iron calibration feature once the unit has been installed on the ROV, AUV or other underwater application.


An ISA500 For Every Application

The ISA500 is available in a range of housing configurations and materials.

The unit can be provided in 1000, 6000 & 11,000 meter rated housings and is available in either Titanium or Acetal.

Both forward looking and right angle housing configurations are available – enabling simple integration into any underwater vehicle, structure or device.

The ISA500-OEM is also available, which offers an un-housed version of the ISA500 for integration into a third party housing or system.


ISA500 Manual

Download brochure

Additional information

Year of initial development


Slant range correction


Max. Operating frequency [kHz]


Minimum range {m}


Maximum range {m}


Depth rating {m}

11, 000

Output data format

Various ASCII Outputs – Configurable

Sampling rate (fixed or adjustable)

10 Hz (Adjustable)

Data flow

Continous, Triggered, Both

Data storage


Analog resolution

12 bit

Stand alone mode


Sound velocity input


Pressure sensor


Right angled type


Additional capabilities

Also provides Heading, Pitch, Roll & Temperature, Available in various housing materials and mechanical configurations.

Distinguishable features

– Integrated Heading, Pitch & Roll (Optional)- 120+ meter range- 1 millimetre resolution – stable & repeatable – All settings are software configurable (Range, Frequency, Slant Range Correction, Output String, Communications, etc)- Can be paired with the ISD4000 to provide Survey Grade Depth & Temperature- Supplied with seaView software suite – Can be used for Hydrographic Surveys with the seaView Hydro Survey app- Can be used for Flooded Member Detection (FMD) with the seaView FMD app


Impact Subsea


Impact Subsea

Unit 10 & 11, Castle Street, Castle Road Industrial Estate

AB41 9RF Ellon

United Kingdom

Min. acoustic accuracy

0.75 millimetre

Digital resolution

1 millimetre

Year of latest version


Weight in air [kg]


Area of Application

Subsea ROV & AUV

Field of Use

Accurate, Short & Long Range Distance Measurement

Languages Supported


Power Supply [V]

9 to 36VDC

Operating current

30mA @ 24VDC, 51mA @ 24VDC (Max Ping Rate & Power)

Output interface

RS232 & RS485

Analog output

Software Configurable Current or Voltage Output

Weight in water [kg]


Max. acoustic accuracy

0.75 millimetre

Width [m]


Length [m]


Min. operation temperature [°C}


Housing material

Titanium or Acetal

Max. operation temperature [°C}


Min. Operating frequency [kHz]




Beamwidth {deg}

6 Degree Conical