John R. Copeland wrote:
For example, a Garmin 430...
Outside 30 nm from the destination, the sensitivity is 5 nm per dot.
Inside 30 nm from the destination, the sensitivity changes to 1 nm per dot.
Two miles from the final approach fix in the approach mode, the
sensitivity changes to 0.3 nm per dot.

You must have confused full-scale sensitivity with "per dot" sensitivity.
Your numbers are wildly excessive, compared to my CNX80.
I could pull up the Garmin Simulator to check the 430, but so could you.
Let us know if the 430 really has that rotten sensitivity you mentioned.

Your right, I misread it.