meshtastic/docs/software/integrations/caltopo.mdx

---
id: integrations-caltopo
title: CalTopo / SARTopo
sidebar_label: CalTopo / SARTopo
sidebar_position: 1
---

## CalTopo / SARTopo

Meshtastic can integrate with [CalTopo](https://caltopo.com/) Desktop edition quite easily through the product's APRS over serial support. 

### Configuring the Meshtastic device

To configure our Meshtastic device for this integration, we have a couple of different options, both of which utilize the [Serial module](/docs/settings/moduleconfig/serial):

#### Enabling serial over the device's USB port
```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
```

#### Enabling serial over an external USB to Serial adapter
```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
Ensure that serial baud rate is set to `9600` on both the Meshtastic device and the CalTopo / SARTopo `topo.properties` configuration
:::


### Setting up CalTopo / SARTopo

To setup CalTopo for Meshtastic integration using the Live Tracking via APRS, refer to the [documentation](https://training.caltopo.com/all_users/share/live-tracking#aprs).

Example `topo.properties` file configuration for use with Meshtastic:

![topo.properties](properties.png)