“Works” at the poles is not the same thing as “has the same accuracy at the poles as it does at lower latitudes.”
Which is what the poster you were replying to was trying to say: the GPS constellation does not pass over the poles so apparent elevations of the satellites will never be as high at the poles as they appear between around 70 degrees N/S.
This is a bigger deal for ships (he mentioned he learned his info 15 years ago at the naval academy) than it is for aircraft. Being several miles in air does wonder for increasing the horizon distance and hence the visibility of satellites in the constellation. Combined with cheap, accurate accelerometers available on something as small as a fingernail and effective GPS accuacy in the 2020’s is just as good at high latitudes, and much more so now than it would have been in the 90’s or early 00’s.
This is exactly what I’m saying minus the accelerometers. These accelerometers have nothing to do with GPS. They are relevant in a modern INS / IRS system (usually Ring Laser Gyros which are a little bigger than a finger nail still) and therefore the Best Computed Position (BCP) calculated by the FMS.
Well, to clarify, the Garmin Trainer, which is the same software as the Real World unit, displays the compass rose at Magnetic, and I do not see an option to change that in any of the Garmin Trainer’s setup screens. QED
Issues reported to pms50, ref the Compass rose on his GTN750.
In less than 3 hours the correction was implemented in the latest update, and that update released.
You cannot get better Product Support than that - and this has been the pattern with Pms50, that really sets him, as a 3rd party Dev, above ALL others.
