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| Iridium prototypes of SVP-B drifters were developed and tested in 2008. Part of the buoys were equipped with Real Time Clock (RTC) to have samples at round hours and GPS receivers for better tracking of buoys. SVP-B mini drifter with new version of barometric port was deployed in the Drake Strait well known with tough weather conditions. The buoy shown good quality of air pressure measurements for full lifetime without negative displays of Bernoulli effect that took place before for this kind of drifter with smaller diameter of surface sphere. The time delay in data transfer from the buoy to user was within 3-4 minutes. Iridium SVP-B drifter with 41-cm hull and without GPS has lifetime near 800 days. On the other hand it was determined some software bug connecting with GPS synchronization of RTC. The negative output of this bug was that buoy controller could turn to sleeping mode and buoy stopped data transfer. This problem has been solved for 2009 SVP-B and SVP-B mini buoys generation. Synchronous measurements are good thing for hydrometeorologists as well as for oceanographers. In particular, the buoys with synchronous GPS locations and drogues fixed at different depths can be used for investigation of shift currents. Similar experiment was carried out in Atlantic Ocean where two buoys with drogues attached at 15 and 50-m depths were used.
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