Thanks Marty, did similar tests this week to check run times.. I'm heading to Nassau this weekend for 5 days at breezes along with 3 double dip trips Gonna play tourist and check out the blue hole with bahamas divers along with a shark trip with stuart coves. No idea on trip 3 yet. Rest of the trip is quiet time with my non diving better half. I was hoping backscatter would have the flip up filter ready.