# Alti V4 vs GPS V4: Which instrument should you choose?

The **Alti V4** and **GPS V4** instruments share the same hardware platform and offer an ultra-precise and highly responsive variometer.\
The main difference lies in the presence of an integrated GPS receiver..

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### **Alti V4: simplicity and connectivity**

The **Alti V4** is designed for pilots looking for a **simple, lightweight, and connected instrument**.

#### **Key features**

* ultra-precise multi-sensor variometer
* pressure altitude (QNH)
* customizable display
* maximum battery life
* Bluetooth connection to the Syride Link app
* display of GPS data from your smartphone

#### **Flight recording**

The Alti V4 can display GPS data (ground speed, GPS altitude, glide ratio, etc.) and record your flights when connected via Bluetooth to the Syride Link app, which provides the required GPS data.

#### **Advantages**

* optimized battery life
* ease of use
* compact and lightweight
* ideal for pilots already flying with a smartphone

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### **GPS V4: a fully autonomous instrument**

The **GPS V4** integrates a high-precision GPS receiver, allowing fully autonomous operation.

#### **Additional features**

* ultra-precise multi-sensor variometer
* integrated high-precision GPS
* automatic flight recording without a smartphone
* direct display of position, distance, glide ratio, and heading

#### **Advantages**

* fully autonomous operation
* automatic flight recording
* independence from a smartphone
* ideal solution for recreational and hike & fly
* signed IGC file

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### **Comparison table**

| Function                         | Alti V4 | GPS V4  |
| -------------------------------- | ------- | ------- |
| Variometer                       | ✔       | ✔       |
| Pressure altitude (QNH)          | ✔       | ✔       |
| Flight recording                 | ✔\*     | ✔       |
| Customizable display             | ✔       | ✔       |
| Integrated GPS                   | —       | ✔       |
| Live tracking                    | Via app | ✔ + app |
| Altitude                         | ✔       | ✔       |
| Navigation (distance, heading)   | Via app | ✔       |
| Proximity (airspaces, obstacles) | —       | ✔       |
| XCTrack / FlySkyHy compatibility | ✔       | ✔       |
| Smartphone required              | ✔       | —       |
| Signed IGC file                  | —       | ✔       |
|                                  |         |         |

\* Requires connection to the Syride Link app

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### **Which instrument should you choose?**

#### **Choose the Alti V4 if:**

* you always fly with a smartphone using the Syride app
* you only need to share pressure sensor data with XCTrack or FlySkyHy
* you do not want or cannot use GPS (e.g. paramotor competition)

#### **Choose the GPS V4 if:**

* you want a fully autonomous instrument
* you want to record flights without a smartphone
* you need reliable flight data directly on the instrument
* you require a signed IGC file for flight validation

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### **Compatibility with the Syride Link app**

Both instruments are compatible with the **Syride Link** app, which allows:

* live tracking
* flight analysis and transfer
* instrument configuration
* map display
* GPS data transmission to the Alti V4