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damoncooper said:Not to be a wet blanket but...
When the poster above says it clears up in 2nd or 3rd pass, isn't that still undesirable?
Shouldn't the declination be looked up in a table (and kept fresh each release) based on GPS coordinates and applied immediately?
A couple of thoughts:
1. I don't think we know yet if it clears up after a couple of passes per boot, or whether it also saves learned declination between battery changes. If the latter, it may be a non-issue until you move regions. And in either case, it seems way better, faster.
2. The lookup table is an easy to understand example many have latched onto, but how would it be built? What resolution would you use? The big world map has only three easy-to-digest bands, but in reality it's a more or less smooth gradient with hundreds of different declination figures between points. Would an area set as -8 be enough if an area is actually -10.2, or -14.9?
Keeping a dynamic system that learns and corrects over time is beneficial in a number of cases, including "between" zones on a low resolution table, or if there are areas with local anomalies not generally captured in a global map.
Just brainstorming...