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I download the unexplored tiles kml, convert it to gpx and then upload that to gpxeditor.co.uk (which I pay the subscription for), looks like this:-
That means I can plan the route on that site and make sure I go in all of the tiles I want. I've also got a script to clean up the converted kml->gpx file so that it just has one box for each area of unvisited tiles:-
Although it's easier to miss a specific tile if I use this for planning, I always go back and check the route on the first one to check every tile I want is visited.
(Haven't done any tile bagging for months due to injury and now lockdown, will aim to get back out when I get some cycling fitness back.)
How have you overlaid planned routes with the veloviewer map?
Is it some kind of hack or accessible to those with boomer-level internet skills?