The answer to the original question is that yes it can be done on a 757.
There are a few variants of FMC. PIP/Pegasus etc
You will need a pegasus FMC to be able to do it. If you are not sure, go to the fix page and if Key 6R has a FL/ETA prompt it is a pegasus FMC.
This FMC on the fix page allows you to enter radials and distances on the left hand side at keys 2/3/4L under BRG/DIST in the format say 270/50 i.e 270R and 50 miles. If you simply leave the bearing info out and enter a distance in the format /50 in this case, it will draw a ring around the waypoint at the desired distance.
Hey Presto!
Last edited by KUMOOZ; 4th August 2008 at 07:14.