Originally Posted by
easymxp
eheh in the end I use the same technique, works perfectly. But sometimes the lazy part of me wonders how to use the Airbus magic and resting a bit my mental maths

The only mode in which you can rely on level off arrow is V/S. All the other modes are "approximations", or in other words, it changes constantly according to actual conditions (current V/S, wind....) and it is not precise. In general, more constraints in FMS for the descent, the vertical calculation is bigger crap