Altitude deviation alarm / alert

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Altitude deviation alarm / alert

Author	Message
James Pearce	James Pearce posted 5/9/2026 9:00:33 AM Topic Details Share Topic
Group: Forum Members Posts: 9, Visits: 8	Is there a way to set an alarm in SkyDemon for a predetermined altitude? Situation - I fly between 2 areas of controlled airspace with lower limits of 2000'. I usually maintain a 400' - 500' buffer but had a bit of a squeak yesterday in thermic conditions and lack of attention that got me to within 120' - Phew 😳. An alarm at 1700' could alert me well before I get close to the airspace. It's all down to me, I know but it is a feature I would use. Thanks, James.
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TimT	TimT posted 5/10/2026 12:38:52 PM Post Details Share Post
Group: Forum Members Posts: 96, Visits: 92	Isn't this what airspace warnings do? I frequently get a "airspace 600 ft above". And presumably I would also get a "Entered controlled airspace" should I punch through that ceiling. But I see what you want, you want a 'last reminder' just before you violate that airspace about. 600 ft vertically or so is too early for you. And once you are in, it's too late. I can set an ATL Alert on my Garmin TXP. But that would be pressure ALT. In our neck of the woods, PA is always a bit lower than actual ALT, so that gives me that 100 or 200 ft buffer. Edited 5/10/2026 4:35:35 PM by TimT
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grahamb	grahamb posted 5/10/2026 3:02:35 PM Post Details Share Post
Group: Forum Members Posts: 645, Visits: 31K	+x TimT - 5/10/2026 12:38:52 PM But that would be pressure ALT. In our nick of the woods, PA is always a bit lower than actual ALT, so that gives me that 100 or 200 ft buffer. How can you say the PA is -always- lower than indicated altitude when the former is based on a standard setting, and the latter on the actual QNH? On a day when the QNH is lower than 1013.25 hPa, indicated altitude will be lower than PA.
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TimT	TimT posted 5/10/2026 4:11:36 PM Post Details Share Post
Group: Forum Members Posts: 96, Visits: 92	+x grahamb - 5/10/2026 3:02:35 PM +x TimT - 5/10/2026 12:38:52 PM But that would be pressure ALT. In our nick of the woods, PA is always a bit lower than actual ALT, so that gives me that 100 or 200 ft buffer. How can you say the PA is -always- lower than indicated altitude when the former is based on a standard setting, and the latter on the actual QNH? On a day when the QNH is lower than 1013.25 hPa, indicated altitude will be lower than PA. Hi Graham, in principle you are of course right. I was just saying that in my country ("in our neck of the woods") the QNH is almost always between 1020 and 1030 hPa. But you are right, this might be of little relevance to the OP. So never mind. Back to the suggestion from the OP: What do you think of the request that on top of the already existing warnings "Airspace 600 ft above" and "You entered airspace", it was suggested that we need a second warning "Airspace 300 ft above"?
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grahamb	grahamb posted 5/11/2026 6:19:54 AM Post Details Share Post
Group: Forum Members Posts: 645, Visits: 31K	+x TimT - 5/10/2026 4:11:36 PM +x grahamb - 5/10/2026 3:02:35 PM +x TimT - 5/10/2026 12:38:52 PM But that would be pressure ALT. In our nick of the woods, PA is always a bit lower than actual ALT, so that gives me that 100 or 200 ft buffer. How can you say the PA is -always- lower than indicated altitude when the former is based on a standard setting, and the latter on the actual QNH? On a day when the QNH is lower than 1013.25 hPa, indicated altitude will be lower than PA. Hi Graham, in principle you are of course right. I was just saying that in my country ("in our neck of the woods") the QNH is almost always between 1020 and 1030 hPa. But you are right, this might be of little relevance to the OP. So never mind. Back to the suggestion from the OP: What do you think of the request that on top of the already existing warnings "Airspace 600 ft above" and "You entered airspace", it was suggested that we need a second warning "Airspace 300 ft above"? What a lucky person you are, never having to suffer a near constant stream of Atlantic depressions!
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Tony N	Tony N posted 5/11/2026 7:30:31 PM Post Details Share Post
Group: Forum Members Posts: 384, Visits: 2.6K	+x James Pearce - 5/9/2026 9:00:33 AM Is there a way to set an alarm in SkyDemon for a predetermined altitude? Situation - I fly between 2 areas of controlled airspace with lower limits of 2000'. I usually maintain a 400' - 500' buffer but had a bit of a squeak yesterday in thermic conditions and lack of attention that got me to within 120' - Phew 😳. An alarm at 1700' could alert me well before I get close to the airspace. It's all down to me, I know but it is a feature I would use. Thanks, James. Do you have the SD audio alerts connected to your radio/intercom/headset? I do and find it invaluable when SD warns of "controlled airspace xx feet above". The trigger appears to be when I start climbing, intentionally or unintentionally due to thermal activity. I frequently fly between Southampton and Bournemouth where CAS is at 2000 ft. My aircraft is quite "light" so is affected by thermal activity. I watch my altimeter carefully!
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