[TorpX]

In SH 1 latitude minute is equal to 1 longitude minute and this varies in distance from map to map.

The navigational program actually has corrections factors for longitude as well as latitude – I never dreamt that anyone with any navigational knowledge would so bluntly disregard what any sailor knows – that there is a difference of longitude and latitude minutes in distance, one varies with position and the other is constant. I took me a long time to recognize this, I was full of disbelief.

That was pretty much my reaction.

I kept checking my figures looking for a (reasonable?) expanation.

Well I'm glad I wasn't the only one who was bothered by this.