Archival tags have definitely increased the amount of information that scientists can glean from individual tagged fish. However, their biggest downside is that a tagged fish must still be caught and the tag returned for any data to be yielded. Enter the pop-up archival satellite tag, or PSAT. PSATs collect much of the same information that archival tags do, but are not dependent on fish being recaptured and the tag returned. Instead they are externally deployed on fish, using an anchor and tether, and ride along with the fish while collecting depth, temperature and location information. At a predetermined date after the tag is deployed, the tag decouples from the tether and floats to the surface, where it transmits data over the course of several days or several weeks to orbiting satellites. This is truly great “fire-and-forget” technology, but the PSAT’s fundamental drawback is its cost, which can be upward of $4,000 per tag. As such, it can often be difficult for scientists to deploy large numbers of tags.