It's not too hard to split up lines in the log file. Just look at the elevation track and add a " start new map line" entry manually (note the space). If you don't want to lose a point, copy the last /loc from before where you put the new map line and paste it after the break.
But, yeah, experience makes it easier to know how and when to break your lines for multi-line maps.
You can also use the color and group emotes to make your life easier.
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