In this version, the periscope does not stay centered on the target. You're not doing anything wrong.
Range can be determined by the Stadimeter (although arguably inaccurate at long range) or by using the map tools with "Map Contact Updates ON".
Speed can also be determined by using the Stadimeter, or by using the 3 minute rule by marking the contact on the map and using the distance traveled in 3 minutes to determine the speed. e.g. 400 kilometers in 3 minutes = 4 knots.
There are also mods available that provide other means of getting both speed and range.
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