Thumperdown, not track crawling !!!!!
Even the most featurless country has some and it you stay on track you won't need to bend your brain around 1/60's, heading correction, inflight wind calculations.
Knowing how to use either method is obviously the preferred method but 10 mile markers are just way more useful and are not effected by GS. If they come and go at 3 minutes then you've just got more accurate navigation. Why not speed your cycle up. It surely can't take the 5 minutes after the 6 minute marker to sit relax and scratch ??