See the bottom
before you drop
Waterscope puts your boat on survey-grade seafloor, shows the reef under you, and maps how rough the water will be hour by hour
Open the chartSanta Cruz, Half Moon Bay and San Francisco today. Not for navigation; always carry a real chart
Frequently asked questions
What Waterscope shows, where it works, and what it is not
From NOAA's own surveys: multibeam soundings at 1 to 4 meters along most of the coast and its 3 meter coastal model elsewhere, with California's offshore rock maps on top. Waterscope reads the depth and the relief under every GPS fix right on your phone.
Yes. Save an area for offline and every seafloor, reef and satellite tile for it stays on your phone, so the chart, the depth and the reef finder keep working miles out.
How rough each part of the water will be, hour by hour for ten days: wind and gusts, chop and swell made steeper where the tidal current runs against them, the current itself, the shipping lane and the breaks.
Santa Cruz, Half Moon Bay and San Francisco, each with its launches, reefs and forecast. More areas follow.
No. Waterscope is a fishing aid, not a navigation chart. Carry an official chart and a working radio, and check the marine forecast before you go.
Nothing while it is in early access. Open the chart on your phone and add it to your home screen.