I posted the below reply on someone else's post a few weeks back. The fixed crawl is not slow, nor is it hard to learn. It is quite simple and extremely accurate for hunting with a traditional bow. A brass nocking point added to the string at your fixed crawl location is no slower than addressing the string 3 under or split finger. See below for more detail:
A fixed crawl is an abbreviated form of stringwalking.
While stringwalking, your tab is positioned vertically at different positions down the string (the further away from the nock down the string, the closer the shot).
As you can imagine, in low light and under the pressure of a fast approaching animal, looking down at your string, making the crawl to the right location, and executing the shot may be too much to ask especially if you have a P&Y buck quickly approaching, changing it's distance from you every couple of steps. (which would require a new crawl to occur)
So a fixed crawl in the most basic sense is adjusting your point on distance. Everything else is handled just like gap shooting.
This is extremely handy for guys like me that love the feeling of a low anchor point. My point on distance shooting 3 under is roughly 40 yards, and my max gap (20 yds) is around 15 to 18".
By crawling down the string to my 25 yard crawl (now my new "point on" distance) this basically means at 25 yards I stick my broadhead on the animal and the arrow goes there. The "fixed" part of fixed crawl simply means I put a brass nocking point right at my 25 yard crawl. So now instead of addressing the string under my second nocking point right under my arrow, I'm addressing the string at my 25 yard crawl every time at the nocking point placed ~0.75" below my arrow nock on the string.
Another benefit of using a fixed crawl is that in reducing my point on distance to my preferred 25 yards, my max gap now becomes 12.5 yards. In addition, that 15-18" max gap just became 8" with the fixed crawl.
Sooooo, now I tune my arrows and broadheads from one crawl distance on the string (25 yards).
Anything under 25 yards, I hold the tip at the bottom of the chest. (it will effectively shoot between 2 - 8" high putting me in the vitals)
At 25 yards, I'm holding center of chest.
At 30 yards, I'm holding at top of back.
I stringwalk all my hunting and competition bows throughout the off season with no fixed crawl. Basically crawling to a different location on the string for each individual distance.
But as soon as the weather starts to get cooler and fall is approaching, I choose my preferred hunting rig for the year, put a brass nocking point at my 25 yard crawl position, tune in my broadheads, and hit the woods.
Its a deadly approach and remedies a lot of issues found with gap shooting or stringwalking for hunting. (summarized below)
Stringwalking issues a fixed crawl fixes:
1. You can tune your broadhead at one location
2. Can address the string and execute a shot without trying to make your crawls with game approaching
Gap shooting issues a fixed crawl fixes:
1. for us low anchor guys, it greatly reduces our point-on distance to whatever you choose. (15,20,25,30 yards - wherever you want)
2. By reducing your point on, it also reduces the extremely large gaps that us low anchor guys face.
3. The tip stays on the deer for most shots in the woods.
Happy hunting!