> For the complete documentation index, see [llms.txt](https://manuals.syride.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://manuals.syride.com/nav-v3-english-manual/xvii.-suggestion-of-use.md).

# XVII.	Suggestion of use

* <mark style="color:red;">**We suggest you to turn-on your instrument while preparing your flight in order to be sure you get the GPS fix before starting your flight.**</mark>
* Use the strap <mark style="color:red;">**to secure**</mark> your instrument while flying.
* Electromagnetic perturbations from VHF antennas can disturb GPS signal.
* If the SYS'NAV is very hot and you fly in very cold air, **fog** can appear on the screen. It will dissipate within minutes.
* Only use the **backlight** if required. Otherwise the autonomy will decrease significantly (30%).
* A **Factory Reset** from SYS PC Tool (Configure my instrument ![](/files/hh8jdyHfUrOM7gBvhWmL) Repair ![](/files/0RCa1PdzpUknz1CLOium) Factory reset) ables you to get your instrument back to default state (every recorded flight will be deleted).
* When you connect your instrument to a USB charger, the battery will start charging, even if the instrument is turned-off.