Solved: what is wrong with this LatLong->Distance code? A Trigonometry "feature".

[StephenG1CMZ]

I guess where I was wrong in thinking it should "just work", is I wasn't thinking of the DMS format as including a unit. After all, it was degrees, not underscore degrees to be consistent with other units - and the same syntax could also have been hours.

I was thinking of it as more of just a different presentation of a decimal number, and assuming the calculation would be unchanged. Like 1.5 = 1,5.. Like decimal 5 = hex 5.

Seeing your other examples with units, I see it's not as simple as keeping the presentation and calculation separate.

As it stands, this issue seems likely to catch people out unless they are aware of it and code around it. But I am not sure what could or should be changed to make things clearer.