Prawler
The Prawler device, which is attached to the mooring line, uses wave-powered energy to crawl up the line, taking temperature/salinity measurements along the way. The Prawler (Profiler + Crawler) enables CTD profiling using Wave Energy from a surface mooring, and is a step towards next-generation Tropical Moored Buoys. The schematic diagram below shows the concept of operations for the Prawler on an Easy-to-Deploy Mooring.
![Schematic showing prawer operations concept Schematic showing prawer operations concept](https://webarchive.library.unt.edu/web/20161227004209im_/http://pmel.noaa.gov/edd/sites/default/files/thumbnails/image/prawler-schematic-concept-of%20-operations.jpg)