Glossary
A reference for terms you will encounter when using Meshtastic and reading this documentation.
Meshtastic terms
Karida Cloud An optional web-based dashboard for Meshtastic teams sold by Karida. It connects to your Meshtastic network and provides live position maps, message history, and device monitoring from any browser. Not required to use Meshtastic. See the Karida Cloud page.
Channel A named communication group within the mesh network. Devices on the same channel can exchange messages. You can configure multiple channels on a single device (e.g., a public default channel and a private team channel).
Default channel (Channel 0) The pre-configured public channel that all Meshtastic devices share out of the box. Messages on this channel are visible to any nearby Meshtastic device. Useful for contacting other users in your area.
Firmware The software that runs on the Meshtastic device itself. Firmware updates add features, fix bugs, and improve performance. See Firmware Updates.
Hop When a message passes through one device to reach another. If your message goes through two relay devices before reaching the recipient, that is two hops. Meshtastic allows up to 7 hops by default.
Mesh network A network where devices communicate with each other directly and relay messages for other devices. Unlike a traditional network with a central tower or router, every device in a mesh can forward data for every other device.
Node A single Meshtastic device in the network. Each node has a unique ID and can send, receive, and relay messages.
Position sharing The automatic broadcast of GPS coordinates from a device to other devices on the same channel. This allows team members to see each other's locations on the map in the Meshtastic app.
Primary channel The main channel a device uses for communication. This is typically Channel 0 (the default) or Channel 1 (a private team channel), depending on your setup.
QR code sharing A way to share channel configuration between devices. One device generates a QR code that other devices scan to join the same channel with the correct encryption key.
Relay / relay node A device that forwards messages between other devices that cannot reach each other directly. Any Meshtastic device automatically acts as a relay. A dedicated relay is a device placed specifically to extend coverage (e.g., on a rooftop or ridge).
Region setting A configuration that sets the radio frequency and power limits for your country. In Japan, the correct region setting is JP (920 MHz band). Using the wrong region setting may violate local radio regulations.
Radio and networking terms
Frequency band A range of radio frequencies allocated for a specific purpose. Meshtastic in Japan uses the 920 MHz band, which is designated for low-power data communication.
Giteki (技適) Japan's radio equipment certification mark (技術基準適合証明). A device with Giteki certification has been tested and approved for use in Japan. Using uncertified radio devices is illegal. See Legal and Compliance.
Line of sight (LoS) A clear, unobstructed path between two devices. Radio signals at 920 MHz travel best with line of sight. Obstacles like buildings, hills, and dense vegetation reduce range.
LoRa Long Range radio technology. The underlying radio protocol that Meshtastic uses. LoRa is designed for low-power, long-range communication at low data rates, making it ideal for text messages and GPS positions.
MQTT A lightweight messaging protocol used for internet-connected Meshtastic networks. When a Meshtastic device connects to the internet (via a phone or gateway), it can bridge messages to other mesh networks over MQTT.
MQTT gateway A Meshtastic device connected to the internet that bridges the local mesh network to other networks via MQTT. A gateway allows messages and positions to pass between geographically separate mesh networks. Karida Cloud uses an MQTT gateway to receive data from your devices.
PLB (Personal Locator Beacon) A dedicated emergency device that sends a distress signal via satellite to search and rescue services. Unlike Meshtastic, a PLB is designed specifically for life-threatening emergencies and is monitored by rescue authorities.
Satellite messenger A device (like Garmin inReach or SPOT) that communicates via satellite for messaging and emergency SOS. Provides global coverage but requires a subscription. See Meshtastic vs Satellite Messengers.
Japan-specific terms
DCR (デジタル簡易無線) Digital Community Radio. A popular handheld radio system in Japan operating on the 351 MHz band. Requires registration but no license exam. Provides voice communication. See Meshtastic vs Digital Community Radio.
Giteki mark (技適マーク) The physical certification label found on approved radio devices. Look for this mark when buying any radio equipment for use in Japan.
J-Alert (Jアラート) Japan's nationwide early warning system for earthquakes, tsunamis, and other emergencies. Delivered through cell phones, TV, radio, and municipal speakers. Meshtastic does not replace J-Alert.
Bosai (防災) Disaster preparedness. A core concept in Japanese society, involving community drills, emergency kits, and neighborhood coordination. See Disaster Preparedness.
Jichikai / Chonaikai (自治会・町内会) Neighborhood associations in Japan. These volunteer organizations coordinate local activities including disaster preparedness. Meshtastic can support their communication during emergencies.
CocoHeli (ここへリ) A subscription service in Japan where hikers carry a small beacon that transmits their ID. If they go missing, helicopter search teams can use directional equipment to locate the signal. CocoHeli provides a different kind of safety net from Meshtastic - it helps rescuers find you, while Meshtastic helps your group stay in contact with each other.