Good radar testl: Tilt it all the way down and line one of the range rings up to the terrain. You'll see all four colors plus if it follows the range ring it's level. Otherwise it's tilted to the side a bit (works better in flat areas).
Also tilting the radar to -0.6 you should see that terrain line at about your height AGL /1000. So if you are at 35,000 and the ground is about 1,000 MSL then you should see a nice solid line at 34 miles ahead.
For the FMS when you enter a custom fix you can add a /then a custom name as well. For example: SWL/-15/TOD. Will add a fix called TOD 15 miles short of SWL as opposed to SWL01. It will also work with ROC190/HDP350/YOU.