Search Sonardyne

Follow us

Products Instruments & Software

Deep Marker Beacon

Deploy, mark, leave, locate

Engineered for: Structure

Our Deep Marker Beacon has been designed for low cost applications where a compact design is an important operational factor but where deep water operation is required.

At a glance

Use it with ROV-Homer to locate targets in deep water; tools, landers, structures…

Choice of depth rating; 4,000 or 12,000 m

Long life battery—up to 4.5 years listening life

Compact and rugged design

Mark it, leave it, find it

Want to know more?


The Deep Marker Beacon enables critical targets such as underwater structures, diving bells and instrumentation packages to be marked unambiguously and later relocated using our Homer-Pro and ROV-Homer range and direction systems.

The unit operates in the HF frequency band from 35–55 kHz. External programming of interrogation address and reply frequencies are incorporated.

The transponders operate with our diver hand-held range and direction device Homer-Pro and ROV-Homer for use on remotely operated vehicles (ROVs). The diver’s/ROV’s unit interrogates the transponder to be relocated (specified by the diver or ROV pilot) and from the reply, determines both the range and direction of the transponder.

The compact design of the transponders enable normal or emergency relocation of points of interest, underwater distance measurement and small target and diver tracking.


Feature Type 7835-000-02 Type 7835-000-05
Depth Rating 4,000 m 12,000 m
Transmit Source Level (dB re 1 µPa @ 1 m) >183 dB >183 dB
Reply Frequency Programmable 1–9 Programmable 1–9
Operating Frequency HF (35–55 kHz) HF (35–55 kHz)
Receive Sensitivity (dB re 1 µPa) <100 dB <100 dB
Switch On Continuously operating Continuously operating
Quiescent Life Alkaline 2 years n/a
Lithium n/a 3 years
Long-Life Lithium 4.5 years n/a
Interrogation Mode Sequential Sequential
Interrogation Address Programmable 0–9 (1–401 optional) Programmable 0–9 (1–401 optional)
Mechanical Construction Anodised aluminium and stainless steel Titanium grade 5
Dimensions (Length x Diameter) 380 x 63.5 mm (15.0 x 2.5”) 354 x 80 mm (13.9 x 3.2”)
Weight in Air/Water 1.9/1.2 kg 5.5/3.8 kg

Need product support? Try our knowledge base

Mark it, leave it, find it