+++
title = "GNSS"
description = "Where you are and which satellites you can see, from the Cap's receiver, with Tracks saved to the SD card as GPX."
weight = 3
[extra]
tag = "GNSS"
screens = ["sky.png"]
+++

GNSS needs the **Cap LoRa-1262**, an antenna with a view of the sky, and **Settings → GNSS** switched **On**. Otherwise the App says `GNSS is off` (or `paused`, when "Pause GNSS for LoRa" has put the receiver on standby while the radio listens). A first fix outdoors can take a while: the App says how long it has been searching.

## Position

The first view shows the fix (`No Fix`, `2D Fix` or `3D Fix`, and how many satellites it uses), then:

- **Lat** and **Lon**, in decimal degrees or degrees, minutes and seconds (**Settings → Coordinates**);
- the **Locator**, the Maidenhead grid square;
- **Altitude**, **Speed** and the direction you are moving;
- **HDOP**, the horizontal precision: a smaller number is better;
- the **Time**, in UTC.

Once there is a fix, the device's clock follows it.

## Sky

<kbd>Tab</kbd> switches between Position and **Sky**: a circle with N, E, S and W, where each satellite is a dot, coloured by constellation, and filled when the receiver uses it. A legend counts, for each constellation (GPS, GLONASS, Galileo, BeiDou), the satellites used and in view.

## Tracks

<kbd>r</kbd> starts recording a **Track**: the route is saved as a **GPX** file on the SD card, in `/gnss/tracks` (named by date and time), and the Status Bar shows `REC`. Press <kbd>r</kbd> again to stop. A Track keeps recording with the App closed. It needs a card and a clock (a fix or Wi-Fi sets it); if it cannot start, the App says why: `GNSS is off`, `No SD card` or `Waiting for the time`. The [Storage App](/guide/storage/) opens a `.gpx` file and shows its points, start, duration and distance.