pyrtcm
RTCM3 protocol parser
Decision gist · record as of 2026-08-14
Yes. pyrtcm is production-stable, actively maintained, has low install friction, carries no known vulnerabilities, and is the only general-purpose RTCM3 parser in the Python ecosystem. Install it if you work with differential GNSS systems, RTK applications, or need to parse RTCM3 correction streams. The BSD-3-Clause license imposes no restrictions on use or redistribution.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python >=3.10; requires an active stream object (file, serial, or socket) that supports read(n) -> bytes method.
- Low friction: pure Python wheel with a single runtime dependency.
- Active maintenance with a release 31 days old and recent commits.
License · maintenance · safety
BSD-3-Clause (permissive) — BSD-3-Clause (permissive): you can use, modify, and distribute this package freely in commercial or private projects, provided you include the license notice and disclaimer.
last release 2026-07-14 (31 days) · last repo commit 2026-07-14 · 114 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 124,447 downloads/mo, #11,869 on PyPI
Alternatives
Verify before relying
from pyrtcm import RTCMReader, ERR_LOG
rtr = RTCMReader(stream, quitonerror=ERR_LOG, labelmsm=1)
raw_data, parsed_data = rtr.read()
if parsed_data is not None:
print(parsed_data)- Which RTCM3 message types are currently implemented beyond the reference to RTCM_MSGIDS in rtcmtypes_core.py.
- Performance characteristics when parsing high-frequency RTCM streams or large batch files.
- Thread-safety guarantees beyond the statement that RTCMReader.read() is thread-safe if the stream is thread-safe.
What it is and what it does
pyrtcm is a Python 3 parser for the RTCM3 differential GNSS protocol, a proprietary standard published by the Radio Technical Commission for Maritime Services. It reads RTCM3 messages from streams (serial, file, or socket), parses them into immutable RTCMMessage objects with named data fields (DF002, DF003, etc.), and exposes those fields as object attributes. The parser handles multiple signal messages (MSM) with configurable output formats (RINEX codes or frequency bands) and supports validation, error handling modes, and extensibility for additional message types.
Typical usage involves creating an RTCMReader with a data stream and iterating through messages, or parsing individual binary RTCM3 frames directly. The library depends only on pynmeagps and installs as a pure Python wheel, making it portable across Windows, macOS, and Linux. It is actively maintained, supports Python 3.10 through 3.14, and carries no known security vulnerabilities.
Use it for
- Integrate RTCM3 correction data from a base station into a real-time kinematic GNSS application.
- Log and analyze RTCM3 messages from a stream for debugging or auditing differential GPS streams.
- Parse archived RTCM3 binary files to extract and validate satellite correction fields for post-processing.
- Build a GNSS receiver application that consumes RTCM3 messages and applies differential corrections.
- Extend the parser with custom message types for proprietary or vendor-specific RTCM3 variants.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
pyrtcm is production-stable, actively maintained, has low install friction, carries no known vulnerabilities, and is the only general-purpose RTCM3 parser in the Python ecosystem. Install it if you work with differential GNSS systems, RTK applications, or need to parse RTCM3 correction streams. The BSD-3-Clause license imposes no restrictions on use or redistribution.
Install
pyrtcm on PyPI
Before you install
Low friction: pure Python wheel with a single runtime dependency. Active maintenance with a release 31 days old and recent commits. Supports Python 3.10 through 3.14.
Requires Python >=3.10; requires an active stream object (file, serial, or socket) that supports read(n) -> bytes method.
License in practice
BSD-3-Clause (permissive): you can use, modify, and distribute this package freely in commercial or private projects, provided you include the license notice and disclaimer.
Quickstart
from pyrtcm import RTCMReader, ERR_LOG
rtr = RTCMReader(stream, quitonerror=ERR_LOG, labelmsm=1)
raw_data, parsed_data = rtr.read()
if parsed_data is not None:
print(parsed_data)Verify before relying
- Which RTCM3 message types are currently implemented beyond the reference to RTCM_MSGIDS in rtcmtypes_core.py.
- Performance characteristics when parsing high-frequency RTCM streams or large batch files.
- Thread-safety guarantees beyond the statement that RTCMReader.read() is thread-safe if the stream is thread-safe.
Package facts
| License | BSD-3-Clause permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packagepynmeagps |
| Maintenance | Actively maintained 31 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 124,447 / month, #11,869 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableEnvironment :: ConsoleEnvironment :: MacOS XEnvironment :: Win32 (MS Windows)Environment :: X11 ApplicationsIntended Audience :: DevelopersIntended Audience :: End Users/DesktopIntended Audience :: Science/ResearchOperating System :: OS IndependentProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Topic :: Scientific/Engineering :: GISTopic :: Software Development :: Libraries :: Python ModulesTopic :: Utilities |
Evidence: pyrtcm-1.2.0-py3-none-any.whl
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