meshtastic/docs/software/integrations/caltopo.mdx

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---
id: integrations-caltopo
title: CalTopo / SARTopo
sidebar_label: CalTopo / SARTopo
sidebar_position: 1
---
## CalTopo / SARTopo
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Meshtastic can integrate with [CalTopo](https://caltopo.com/) Desktop edition quite easily through the product's APRS over serial support functionality.
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### Configuring the Meshtastic device
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To configure our Meshtastic device for this integration, we have a couple of different options, both of which utilize the [Serial module](/docs/configuration/module/serial):
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#### Enabling serial over the device's USB port
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```shell title="Serial over USB"
meshtastic --set serial.enabled true --set serial.baud BAUD_9600 --set serial.mode CALTOPO --set serial.override_console_serial_port true
```
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#### Enabling serial over an external USB to Serial adapter
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```shell title="External serial adapter"
meshtastic --set serial.enabled true --set serial.baud BAUD_9600 --set serial.mode CALTOPO --set serial.txd = 13 --set serial.rxd = 14
```
:::info
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Ensure that serial baud rate is set to `9600` on both the Meshtastic device and the CalTopo / SARTopo `topo.properties` configuration
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:::
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### Setting up CalTopo / SARTopo
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To setup CalTopo for Meshtastic integration using the Live Tracking via APRS, refer to the official [documentation](https://training.caltopo.com/all_users/share/live-tracking#aprs).
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Example `topo.properties` file configuration for use with Meshtastic:
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![topo.properties](/img/software/integrations/caltopo/properties.webp)
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After starting CalTopo Desktop, NMEA waypoint location sentences should be streamed into the logs from the connected Meshtastic device every 10 seconds:
![CalTopo Logs](/img/software/integrations/caltopo/logs.webp)
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In the desktop's web UI for your CalTopo map, scroll down and check the **Shared Locations** checkbox under **Realtime Data**. Your nodes should appear on the map as points if they are connected correctly.
![shared-locations](/img/software/integrations/caltopo/local-stations.webp)
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You can click on one or more of the node points and in the resulting tooltip, click **Record to Map**
![node point](/img/software/integrations/caltopo/click.webp)
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In the resulting dialog, you can assign attributes such as a label or color to the live track created by the node.
![track](/img/software/integrations/caltopo/track.webp)
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When you view the shared map on another device or mobile, the nodes should appear there as well now, if both the desktop and mobile device have internet connectivity.
![app](/img/software/integrations/caltopo/app.webp)