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My opinion is records should be allowed at any track as long as the corrected altitude is no more than 500 feet below the actual altitude of the facility. This would give everybody a chance at a National Record but without the over compensation seen at altitude tracks during cold and high pressure conditions.
The NHRA could install a Standard weather station at each Member track and broadcast the data over an AM/FM station or integrate it into the Icard system. This would give the racers a standardized reference for all runs and a backup to your own weather data.
A cool product someone could built is a small radio receiver that would work in conjunction with the NHRA broadcast and would give an alpha-numeric display of the weather conditions. It could be mounted in the car for real time updates. We could purchase them for a one time fee and have official weather data at all tracks.
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The adjusted altitude can change more than 500 feet between the beginning of a session and the end of it. What would you do there? Have a distinct altitude for every pair? How would that be integrated into the timing system? You'd have to have a hard copy record of each pair, like the run log, with a calibrated adjusted altitude on it for it to be accurate.
I won't go into icard, other than to say, it shouldn't work at divisional events (at least it was supposed to be that way last year).
I can fully understand a desire to have an accurate altitude system in place for record runs and index/HP adjustments, but the way the adjusted altitude can change within a period of minutes, I just don't see a feasible way to do it other than having a set adjusted altitude. If there was a way to have a floating reading, wouldn't it be necessary to do the same thing at sea level tracks?