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# sandbox: Journal 134 has gone to press and is due for publication in June 2026
CREG Journal 134 (0-24)
This issue has a cover date of June 2026 and was published on 1 June 2026.

Summary of Contents
Articles in this issue cover a range of topics in cave radio and surveying. For surveyors, an open-source project for a shoulder-mounted lidar mapping system is described, which can be used while climbing and crawling, even in extremely tiny spaces. Also, the DiscoX project is described, this being a standalone electronic surveying device suitable for DIY construction. Members of the Finnish Caving Society describe how they have processed and analysed large volumes of satellite imagery, geological surveys, and meteorological data, in an attempt to answer the question of whether a large undiscovered cave system lies hidden beneath the limestone layers of Finland's far north. For cave exploration, the Speleoscope is a device that was designed to aid the investigation of cavities using a modified pipe camera. The journal would not be complete with at least a few cave radio articles. Cave radio topics include a mesh-network communications system using inexpensive non-proprietary LoRa repeaters; construction details for the Pinger 2.0 radiolocation receiver; and tuning techniques for tuned loop antennas. See cover picture .

See BCRA Seminars  for info about CREG's series of online seminars for summer 2026.

Front Cover (1)
Tomasz Pawłowski, STJ KW Kraków Poland, with wearable lidar-based surveying device in Jaskinia Zimna. Photo: Tomasz Pawłowski

Contents (2)
List of contents and masthead information.

News and Notes (2)
Style Guide and Submissions Guidelines, CREG Seminars, Hidden Earth 2026, Editorial Team. Please note that the CREG Seminar advertised on page 2 will begin at 19:30 BST, half an hour earlier than written in the journal

Wearable Mobile Mapping System for Cave Surveying - Part 1 (3-6)
Janusz Bȩdkowski, Michał Pełka and Tomasz Pawłowski introduce a wearable mobile mapping system for cave surveying composed of two rigidly assembled 3D lidars. The system is mountable on the shoulder, thus enabling safe use while climbing and crawling, even in extremely tiny spaces. This is provided as an open-source project.

A Technical Exposé of the new Nicola 4 Cave Radio (7-9)
Graham Naylor and Pete Allwright present the architecture of the Nicola 4, with particular emphasis on the potential of this software-defined cave radio as a platform for developing new functionality.

DiscoX: A New High-performance Standalone Electronic Surveying Device for DIY Construction (10-13)
In recent years, electronic cave surveying devices have moved from add-ons for Leica distance meters to standalone units, but these have tended to be proprietary products. By way of contrast, the DiscoX is available for DIY construction and offers advanced features, as Brendan Hall reports.

Correction	(13)
Tuned Loop Antenna Matching Made Easy, Brian Pease, CREGJ 132, pp. 19-21

Minimally Invasive Cave Exploration With a "Speleoscope" (14-15)
Michael Ross describes a method for the exploration of cavities behind narrow fissures or small holes using a modified pipe camera.

Meshocan, a Scalable Wireless Communication System for Use in Caving and Cave Rescue (16-19)
Martín Hierro describes his Meshocan network for communication in caves using inexpensive non-proprietary LoRa repeaters.

Hidden Rivers of the North: Remote Sensing in the Käsivarsi Wilderness (20-21)
Jarmo Ruuth, Jari Arkko, and Duncan Simey of the Finnish Caving Society ask whether a massive, undiscovered cave system lies hidden beneath the limestone layers of Finland's far north. They proceed to describe how they've processed and analysed large volumes of satellite imagery, geological surveys, and meteorological data, in an attempt to answer this question.

Pinger 2.0: A New Radiolocation Receiver - Part 2 (22-24)
Following their introduction to the new Pinger 2.0 radiolocation receiver and discussion of the associated coil options in the previous issue, Ken Smith and Aren Leishman provide constructional details.