CHARTS & LIVE DATA
Keep the boat, the bottom, and the useful numbers on one working screen.
Underway is the at-the-helm view: worldwide NMEA 2000 position, depth, and live readings beside whatever regional chart packs are available for the operating area.
A simple underway view
Example only — not live boat data.
COMPLETE SYSTEM INDEX
Everything in Underway.
Every tool carries its status. Available, field validation, and roadmap never get mixed together.
Chart surfaces
Salinity Chart
Depth-shaded Florida Keys coverage built from NOAA BlueTopo, with soundings in feet below MLLW.
Orange Relief
Offline NOAA bottom relief and hillshade packs with verified completion before a pack is marked ready.
Satellite
Switches to satellite context while keeping the same center, zoom, bearing, and pitch.
Offline packs
Downloads a regional overview plus selected tight fishing areas and streams completed cells from disk.
Tap & hold tools
Probe charted depth or hold a coordinate to start a mark, tide, current, or depth action.
Boat underway
Boat position
Keeps the native position marker above the active chart surface.
Live NMEA data
Shows the boat’s connected speed, heading, depth, engine, fuel, and environmental channels.
Depth Watch
Combines live sounder change and tide context to warn about a shrinking depth margin.
Dual-route networking
Keeps boat TCP data on gateway WiFi while ordinary internet traffic uses cellular when Android permits it.
WHY IT HELPS ABOARD
Download the operating area before leaving service. Once aboard, Salinity keeps that pack, boat position, and connected readings together without treating a phone chart as the final authority.
SIGNED FIELD PREVIEW