We received the following feedback from Andrius Balsevicius, an expert Professional Surveyor who is using STONEX S9IIIPlus for a big project in Equatorial Guinea.

After some experiences with S9IIIPlus in Lithuania, Andrius‘ Home Country, he decided to use the same GNSS receivers for this demanding African job; thanks to In Axis, the Baltics Stonex Authorised Distributor, Andrius got the equipments in a few days and went to Eq. Guinea.

Now let‘s Andrius tell us his interesting story:


In 2013 I had a very interesting job proposal in Equatorial Guinea, Central Africa. I took decision almost instantly, because of the feeling of a real challenge and adventure.

The project CHE Sendje was about building a dam and hydroelectricity station on the mountain river Wele in the west side of the country.

I was trusted to choose necessary survey equipment to perform all surveying activities on construction site. Given the circumstances of complex logistics directly to GQ and subsequent complex support due to slow communications I had to choose from competent suppliers and also keep on the predefined budget at the same time.

After considering all pros and cons, and having references from colleagues in Lithuania already owning Stonex GNSS receiver S9, which has endured quite cold winter, I chose S9 III Plus with UHF from this company as my RTK solution.

Thanks for the guys from InAxis and especially Stonex whose had passed really cumbersome process of direct delivery of equipment to GQ, but nevertheless keeping up my and their promises, just like the DHL did.

Down here in Lithuania we have three independently operating CORS networks, so very little surveyors have experience with UHF RTK workflow. After reading about experience of some UK guys in Ethiopia with 20 W transmitter being able to work only 2 km away from the base, I was expecting nothing more than working in direct line of sight of GNSS base under the conditions of heavy tropical forest in Equatorial Guinea.

To my surprise I was able to measure with UHF transmitted at only 1 W at the extent of 1,6 km, while base was positioned at 111 m altitude, rover – at 70 m and absolutely dense tropical forest reaching 40 m in height for about 800 m of a whole distance from base to the rover.

But it seemed that while I was too sceptical about UHF possibilities, some of my colleagues were too optimistic. Or so I was thinking. My biggest surprise came when after setting base on 38 m altitude we drove down to the river, which was 1,3 km away and at 40 m altitude, but with the same above metioned mountain of 111 m altitude in between. I was absolutely sure we were doomed, but again I was able getting hard fix from time to time which was sufficient for the particular case so we were lucky not going back one more time.

Working with Stonex S9 III Plus was a real pleasure for me. As of the time being S9 III Plus continuous operating at site for total of 1,5 years with no faults. A solid companion you can trust.


Equatorial Guinea Slideshow