Hello, the altitude point is very usefull to set the altitude in the final survey. The altitude value is calculated with the Z value of the entrance Point and the depth survey of the station point. OK. But, in my final survey (pdf), can I have the absolute value (from the sea level) and the depht value (from the entrance) in the same time ? exemple : * the entrance of the cave is at altitude 1000m * my station point is at depth -100 I want to have the altitude value "-100" and "900 m" (from the sea level), on 2 specific altitude point, using and option, on the altitude point. Does it existe ? Is it a new issue to create ? Thanks Gilbert