# gpsio-extension

> Garmin GPS data transfer extension, for use with CalTopo / SARTopo. Uses Native Messaging. Requires additional installation steps; this extension won't do anything by itself. See https://github.com/ncssar/gpsio

Canonical page: [https://chrome-stats.com/d/gpsio-extension](https://chrome-stats.com/d/gpsio-extension)

## Overview

- **ID:** `gpsio-extension`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Tom Grundy
- **Category:** other
- **Daily users:** 2
- **Version:** 1.1.0
- **Last updated:** 2021-11-28
- **First published:** 2021-11-07
- **Size:** 40 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/gpsio-extension/)
- **Website:** [https://github.com/ncssar/gpsio](https://github.com/ncssar/gpsio)

## Description

gpsio-extension is a Firefox add-on called 'Garmin GPS Data Transfer Extension' that allows users to transfer Garmin GPS data with CalTopo / SARTopo. It requires additional installation steps and uses Native Messaging. For more information, visit https://github.com/ncssar/gpsio.

## Rankings

- #69,242 — Overall

## Permissions and access

### Permissions

- `nativeMessaging`
- `storage`

### Content script matches

- `*`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/gpsio-extension)