Unfortunately I am unable to give you a direct answer to your problem, but hopefully by sharing my own experiences I can help:
I keep my Ambit set to 'Automatic' in the 'ALTI-BARO>Profile>' menu.
I know that the ground floor of my home is at an elevation of 134m amsl, and find myself regularly recalibrating my watch #through menu ALTI-BARO>Reference>Altitude# to this whenever I think to whilst at home #once a day, approximately#.
I do find my altimeter to be quite accurate and when I return home from a trip out it's usually within about +/- 5m of the correct value #sufficient accuracy for me#. Of course, I then recalibrate to 134m.
This can be inconvenient when away from home for an extended period of time because, presumably, the error will grow and grow. But, If I note/keep in mind the elevation whenever I "go-firm" at a new location for any period of time, I can use this to recalibrate whenever I return to/revisit this point on my travels. It works well enough for me.
What I can also offer is to say that the altitude given by my Ambit at any one time tallies exactly with that given by my Suunto Core, which I have set to the same profile and employ the same regular re-calibration discipline with: They both agree with one-another very reliably.
I have noticed that the error in indicated altitude becomes greatest during times of stormy/severe barometric pressure variation, but this is to be expected as the watch finds it difficult to determine the difference between a pressure change due to barometric conditions or a change in altitude - this is just a limitation of using barometric pressure to determine altitude.
Ultimately, just like pilots having to change pressure settings on their altimeters regularly in order to keep their altitude reading accurate, we have to recalibrate our watches regularly either with a known altitude at our location or local barometric pressure reference.
Finally, what you could do, if you know the elevation of your start point and are not going to loiter too long at any point along your route, is to set your altimeter profile to 'Altimeter' #in the 'ALTI-BARO>Profile>' menu. Then recalibrate your altitude before you set off. This way your Ambit will interpret any pressure changes as a change of altitude and so should be at it's most accurate. (If you do stop for a while, say more than about 15mins though, you should change to either 'Barometer' or 'Automatic' so that the Ambit 'realises' you are no longer changing altitude and that any pressure changes are due to atmospherics.
I'm sorry to have "banged on" I hope at least some of this is relevant/helpful and that I haven't patronised you at all - I have no idea of your level of knowledge of this : #
Hope you enjoy your Ambit,
Primary Sport: Weight Training
Experience Level: Beginner
answered 1 week, 4 days ago
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