Question: Pre-planned tracks and up-ahead location input workflow

Hey there,

I would like to use the up-ahead feature for a track, that I received as a gpx file. So I need to put in the correct markers, that I want to have displayed in up-ahead.

My question is, if it is somehow possible to achieve this without using Garmin Connect.

I already have the locations as waypoints in Basecamp, so this would be my preferred option.

Does anyone know how to do it or can share a workflow?

Another thing, why I am hesitant with Garmin Connect is, that I would like to do the marker input with coordinates, rather than following the track and "guessing" the placement on the map.

Thanks