View source for GeoLink Altitude Limit

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== <translate>Altitude Limit</translate> ==

=== <translate>How it works</translate> ===

<translate>Altitude Limit is aid feature that can automatilly perform Rescue of the model as soon as it will drop under a specified altitude. Or it can stop the model ascending when it will reach specified maximum altitude.

Whenever the Altitude Limit feature is engaged it will perform Rescue first to notify you it was really engaged. At the same time you can use Altitude Limit as ordinary Rescue mode in case you forgot to engage it prior an unexpected situation.

It will perform Rescue always for at least 1.5 seconds. Then depending on resulting altitude it is turned off and pilot can continue in flight.

On the other hand if the model exceed configured upper altitude limit it will stop ascending there. The model will maintain the level and pilot can descend on will with collective pitch.</translate>

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To enable this feature it is required to tick the CheckBox in the GeoLink window/Aid tab.</translate>

<translate>Altitude for the Hard Deck is programmed in two ways described in the '''Modes''' section above.</translate>

[[File:geolink-alt.png|center|550px]]

=== <translate><!--T:36-->
Usage</translate> ===

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The feature can be engaged at any given time by a switch of your radio. We recommend to use a normal two-state or three-state switch for this feature. But first it is important to decide in which way the feature will be engaged as there are two options:

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# To engage with Stabi function - in this case the feature is engaged when programmed Stabi function is engaged. This mean you do not need to assign any other switch than when used for e.g. Stabilisation mode. ''[LESS CHANNELS ARE USED]''
# To engage with assigned GeoLink channel - it is required to assign ''F: GeoLink Altitude Limit'' function in the ''General/Channels'' to an available channel. ''[EASIER TO SET UP]''</translate>

=== <translate>Modes</translate> ===

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If Altitude Limit is engaged by assigned GeoLink channel there is possibility to use two different modes for activation.
In the Channels window you will be able to see Function as '''On (1)''', '''Off''' and '''On (2)''' which is corresponding to 100%, 0% and special case -1% to -100% channel value.

==== On (1) - Variable Hard Deck altitude ====

When '''On (1)''' is displayed it mean that Hard Deck altitude is programmed from the altitude in which the model presently is. In other words, if you engage the Altitude Limit when flying in 5 meters, the models will be automatically recovered whenever it will drop under 5 meters. This mode is very easy to set, because you do not have to set basically anything. And additionally you can program Hard Deck to any altitude at any moment even without landing.

==== On (2) - Fixed Hard Deck altitude ====

When '''On (2)''' is displayed it mean that Hard Deck altitude is programmed from the channel value itself. It is '''calculated based on the range -1% to -100%''' where -1% is used for the lowest altitude and -100% for the highest altitude that is nearly equal to altitude specified for Maximum parameter.
As soon as you will enable mode On (2) you will also see exact hard deck altitude in the Aid Tab from GeoLink window. This will tell you in which altitude rescue will be performed. If you want to set the Hard Deck to be same each time as with older firmware version such as 3.4.1 then you are looking for this mode. Hard Deck altitude can be changed anytime if you will modify channel value.
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=== <translate><!--T:78-->
Triggering Acceleration</translate> ===

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This parameter is key for engaging the Rescue mode fast enough if your model is approaching towards the ground.
The faster is descending velocity, the faster the Rescue is engaged. This mean that the Rescue can be engaged above configured Minimum limit to save the model safely. If model is approaching the Minimum limit slowly then the rescue is engaged at configured level.
Low Triggering Acceleration value is causing only minor difference.</translate>


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