It works this way:
1) If you identify the ship via hacking it off in the recognitions book
or.... if you give the order "Identify Target" via the WO
In this mode the marker swings too the value given in the ships cfg file for mastheadheight. No matter what you slide it to afterwards it will take the stadimeter reading from this.
2) If you do NOT identify the ship (aka nothing is present in the top field of the TDC)
In this mode you can slide it to any value you want to and take a stadimeter reading that is calibrated from that height. AKA if you have a ONI-208-J book and thus can make out the Funnel height to say 60 ft. then you put the slider on 60 ft. and take your stadimeter shot at the funnel top. If you want the top of the mast then you slide it to the top of the mast height as given in the ONI..
This (2) is how i use it, as i find it VERY helpfull to be able to use any part of the ship i see fit for the measurement. I allso enjoy paging around in the ONI to identify the ship - on long ranges guestimessing from what i can see. fx. starting out with naming it from Mast Funnel placements like the HARUNA MARU is a MMF-split (Mast Mast Funnel with a split superstructure)
If anyone here is interested i can make a mod (build on top of "JP Ship Dimension Fix1.3") available for use with any SH4 ver. where you have the ONI pages for the merchants in SH4 and ship cfg files with Gross tonnage, height, beam, length and draft from the ONI (and crew amount when possible).
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