# XXI.	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>.

&#x20;·          Polarized glasses and sun-glasses helps reducing the sun <mark style="color:red;">**reflection**</mark> on the display

&#x20;·       Use the lanyard in order to <mark style="color:red;">**secure**</mark> your Evolution while flying.

&#x20;·       Electromagnetic perturbations, <mark style="color:red;">**such as VHF (from radios antennas) and magnets (used for example in some harness**</mark>), can disturb GPS signal and the magnetic compass.

&#x20;·       Internal protection automatically shuts down the instrument's battery power in case of <mark style="color:red;">**excessive temperature**</mark> (the instrument may not start if it is left too long in direct sunlight or in a vehicle). In flight the relative wind will allow the restart of the device.

&#x20;·       If the Evolution is very hot and you fly in very cold air, **fog** can appear on the screen. It will dissipate within a few minutes.

&#x20;·       Never turn ON the **Wi-Fi** if your don’t use it, as it drastically reduces battery life.&#x20;

·       A **factory reset** from SYS PC Tool (menu Option ![](/files/ZKaYLDn99ulPuKNzwut4) Advanced) allows you to get your instrument back to default state (every recorded flight will be deleted…). You can also use the **Parameters / Advanced parameters** menu in the instrument (see XII).

&#x20;\-      When you connect your instrument to a USB charger, the battery will start charging, even if the instrument is turned-off.


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