A few days of engineering tests. Ran Bog line from 5-16-19 to 5-19-19. pH sensor failure on 5-16. This was followed by a few more days of engineering tests before spring CANON 2019 test run beginning week of 5-20-19. No science data was recorded during engineering tests. pH sensor stopped reporting good data a few days before the before the beginning of CANON deployments on 5-17-2019 Tiny held station over the DIEMOS echosounder from 5-25-2019 to 6-6-2019 in support of CANON 19S, then ran the BOG line until its recovery on 6-11-2019