PocketGrib vs Marine Instruments

With PocketGrib you can download, view and analyse global weather data while on the go. Wind, precipitation, pressure, temperature, wave and other data extracted from GRIB files are displayed through our powerful GRIB viewer interface. Perfect for sailors (both sailing and in the pub), windsurfers, storm chasers, outdoor enthusiasts, amateur and professional meteorologists. Features - Choose your map location and have weather information overlaid - Animation of weather maps - Weather can be viewed as a meteogram (graph) or raw data - Configurable download to minimise file sizes (great for roaming) - GRIB files can be downloaded to your PC via iTunes - Displays online and offline - Support for 3rd party GRIB files PocketGrib downloads and displays the following weather types: - Wind speed and direction (10 m above ground/sea) - Precipitation (rain, snow etc) - Pressure - Air temperature - Waves (including Mediterranean and Black Sea) - Cloud cover - Relative humidity - CAPE (Convective Atmospheric Potential Energy) - Current (Atlantic only) - 500mb Height Direct download of GRIB data from NOAA's GFS (Global Forecast System) model - Forecasts up to 8 days - Data steps: 3hr, 6hr, 12hr - Worldwide coverage - Resolution: 0.25°, 0.5°, 1°, 2° - Data updated 4 times a day (every 6 hours) Also support for COAMPS (0.2° resolution), WW3, NOGAPS, RTOFS (Currents) and FNMOC WW3 (Mediterranean wave) models. GRIB forecasts are published without human intervention or review. As such, the end user requires some knowledge and awareness. Most GRIB models do NOT accurately forecast hurricanes and tropical cyclones so their use should be combined with specific hurricane and tropical cyclone forecasts.

Marine Instruments turns your iPhone into a boat instrument display. Connect it to your boat's NMEA 0183 WiFi gateway and see your real instruments — wind, depth, speed and heading — on a big, glare-friendly screen. No gateway? The built-in sensors still give you heel angle, a barometer with storm alarm and a GPS trip log. BOAT INSTRUMENTS OVER WIFI (NEW) • Connects to any NMEA 0183 WiFi gateway: Orca Core, Yacht Devices, Digital Yacht, Vesper and many more • Speed over ground (SOG), depth, apparent wind angle & speed, heading • TCP or UDP, configurable host and port (standard 10110) • Automatic reconnection when the connection drops • Values mark themselves stale ("--") within seconds if data stops — no misleading frozen numbers HEEL & ATTITUDE INDICATOR • Real-time pitch, roll and yaw with an aircraft-style horizon • Maximum heel angle tracking for port and starboard • One-tap recalibration to your mounting position • Motion history graph BAROMETER • Live atmospheric pressure from the iPhone's own barometer sensor • 4-hour pressure graph with trend arrow • Automatic alarm with vibration when pressure changes faster than 1.5 hPa/hour — a classic early storm warning • If your phone has no barometer, pressure from the gateway (MDA) is used instead TRIP LOG • Distance in nautical miles, current/average/max speed in knots • Trip duration, reset whenever you like • Recording happens while the app is open — the screen stays on automatically, so mount the phone and sail SEA STATE • Beaufort scale estimate (0-12) from vessel motion • Wave height estimation REAL NIGHT MODE • Every instrument — attitude, barometer, graphs, trip log and NMEA tiles — switches to a red-on-black palette that preserves your night vision • Remembered across launches PRIVACY All data stays on your device. No accounts, no analytics, no tracking. The only network connection the app ever makes is to the gateway IP you enter yourself. Note: for accurate heel and wave readings, mount the device in a fixed position on your vessel.