6MIN Markers
I used to have the exact same problem, flying in and around where you are out of coincidence.
I'm now past that, thanks to one primary thing - Time.
Obtain your ground speed on the day, and plot it against the distance covered in 6 minutes. For example, if my Ground Speed is 120KTS, I would plot a line at 12NM along each track. Once departing the initial aerodrome, I would then write on my WAC/VTC/VNC My departure time +6, and next to the next marker +6 on top of that etc. I found this to be extremely accurate, and even if you are off track, you will be abeam that point at each 6 minute interval.
I choose 6 minutes as it's easily divisible by an hour, and gives a very regular indicator of where you will be. This method is what helped me, and can only recommend it based on that.
Sincerely hope it helps.
Rodrigues