Tinstaafl,
With SCA or doubble the error, there is absolutely no requirement to have a feature on track at the point where the planned track is regained.
Using the SCA, you will be back on track in the standard time. Using doubble the error, you will be back on track in equal time.
Using the 1 in 60 rule to correct direct to the next checkpoint requires you to not only spot the next checkpoint because if you don't you are lost, it also has the problem that you are now following a new unplanned track offset from the planned track. You are comprimising you safety altitude calculations and possibly separation from regulated or special use airspace.
Furthermore, since the correction you made could be for a leg of 100nm or more to destination, any further error on the new track must be assessed with regard to the new track and not against the one carefully drawn on your chart.....or perhaps you think that having calculated the errors using 1 in 60, we should use a ruler to draw in our new track and make new checkpoints?
Get back on planned track asap has to win out....so SCA or doubble error whichever.
Track crawling has it's merits in some situations. It can be very appropriate in certain situations for example keeping clear on controlled airspace. If there is a decent feature - use it. Be aware that if you use traditional navigation you could drift off track between checkpoints so you must make an allowance for that ( a buffer) when flying close to regulated or special use airspace. If there is a well defined line feature (handrail) then pre-planned track crawling along that feature can ensure safe operation.
Another example is following the coast on the seaward side as when doing so, one can disregard obstacles inland for safety altitude purposes since you will not hit them provided you don't fly inland.....can reduse enroute weather minima for the route.
However, it must be an obvious feature and pre-planned with checkpoints...not, not, not the finger on map looking at map and ground and nothing else as we slowly descent towards that hill ahead narrowly missing the low flying military jet type!
Regards,
DFC