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Theoretically, you could do this with lat,lon as well, but it is much easier with UTM.
smile If you are familiar with UTM. I've been using Lat/Long in navigation for over 30 years.

Maybe if the map was only UTM... still, with non-mapping GPS receivers, I use preloaded waypoints for nav.
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Better is the Enemy of Good Enough.
Okay, what’s your point??