It's been a while since I did manual solutions, but the fast 90 is a good way to learn! Soon once you get more comfortable with the process you'll start attacking with other AOBs.
I agree with Zosimus, use the 3,15 timer for better speed estimates.
another thing that helped me was to make a 90degree turn and to keep taking measurements, while also manually drawing bearing lines on the map.
The 90 degree Turn causes the bearing lines to shift, BUT, as the target keeps the same speed and course, there will be one line where the bearing lines are all equidistant from each other.
If this isn't the case, you know your calculations are off.
If I don't forget, I'll post a picture this afternoon after work
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