Pelorus Nav is a free, open-source marine chartplotter for iPhone and iPad. It draws official NOAA electronic navigational charts as crisp vector charts, using the standard IHO S-52 symbology of professional chartplotters. Once you've downloaded a region, everything works offline, far from cell service.
No account, no ads, no subscriptions, no tracking. Your routes, tracks and position stay on your device.
CHARTS
• Official NOAA vector charts (ENC) for US coastal waters, the Great Lakes, Puerto Rico and the US Virgin Islands, and Hawaii, in downloadable regions
• Kept current: NOAA's updates are checked nightly, and the app tells you when a downloaded region has newer charts
• Seamless multi-scale quilting, with more detail appearing as you zoom in
• Day, Dusk, Night and E-ink themes in the official S-52 color palettes
• Depth shading set to your boat's draft, with a safety contour
• Light sectors, charted currents, adjustable detail level and text size
• Offline street map for land detail near shore
• Tap any buoy, light, wreck or depth area to see its details
• Find harbors, islands, buoys and lights by name, even offline
NAVIGATION
• Tap to build routes, drag to edit, snap to existing waypoints, reverse and extend
• Follow a route leg by leg, with an arrival alert and automatic advance to the next leg
• Large, readable instruments: speed and course over ground, VMG, bearing, steer-to, distance and time to waypoint and destination, and ETA
• Projected course line with time ticks
• Follow, course-up and north-up modes; magnetic or true bearings
• Crew-overboard button: press and hold to drop a mark and navigate back to it
• Touchscreen lock, so spray and stray taps can't change anything under way
TRACKS
• Record every outing; recording continues in the background with the screen off
• Track Viewer with a speed-colored track, speed chart, fast playback, and tack and jibe detection
• Stats for any stretch: distance, time, average and top speed
• GPX import and export for routes, waypoints and tracks
TIDES, CURRENTS, WIND & SUN
• NOAA tide and current predictions, computed on your device so they work offline
• 48-hour time bar to see tides, currents and wind ahead
• Wind forecast barbs (internet connection required)
• Sunrise, sunset and twilight times
TRADITIONAL PLOTTING
• Fixes, DR, EP and running fixes; bearing lines, distance arcs, current arrows and notes. Chartwork the way you learned it.
GPS & INSTRUMENTS
• Your iPhone or iPad's own GPS
• Bluetooth LE GPS receivers
• Your boat's Signal K server on the local network (experimental)
• Built-in simulator for exploring the app from shore
Pelorus Nav is an aid to navigation and planning. It is not a substitute for official charts, a proper lookout, and prudent seamanship.
Free and open source under the MIT license.
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