Wave gliders are small, free-swimming, unmanned vehicles that can be navigated remotely and cruise the ocean autonomously measuring various water properties. Their positions and data can be communicated via satellite and tracked over time. They are represented here as a static marker indicating a central location within a polygon showing the total spatial extent of the glider's expected path. Measurements plotted in the marker's pop-up window can be collected from anywhere within or just beyond the polygon's boundary. To show or hide the spatial extent, check the "show glider bounds" box under "advanced options".
time period: ~19 hours behind current; updates every 30 mins.
source: Open Oceans Portal (login required)