AngelNav vs Percival

AngelNav is a new app for iOS developed in collaboration with Tom Cunliffe. Primarily it is a full chart plotter currently favouring raster charts, but it has many additional features including the ability to carry out traditional navigation directly on the screen. The capacity to generate classical chart work is vitally important in the event of a GPS failure, but hitherto has required pencil, plotters, and paper charts. AngelNav allows traditional techniques to be carried out using an iPad or iPhone screen instead of a paper chart. An estimated position can be plotted, position lines drawn from sighted bearings and fixes recorded. Course-to-steer diagrams are readily constructed. AngelNav can read most types of raster chart including the UKHO subscription charts, as well as KAP/BSB files and GeoTIFF files. It can easily create georeferenced satellite charts for offline use. AngelNav can take GNSS navigation data from a variety of sources, including the device's stand-alone GPS, the boat's NMEA over WiFi, and SignalK. It will also display AIS information if available. Annual subscriptions are available as in-app purchases for UKHO, SHOM, and Imray charts covering the whole of the UK, France, Spain, the Mediterranean and the Caribbean. These are divided into folios so that you can subscribe only to the charts that you need. The app is free to use in its basic form, with additional functions and charts available as in-app purchases. This allows a user to fully evaluate the app without charge, and then to purchase the features and charts required. Free features: Chart plotter (Demo chart included) Traditional navigation techniques Waypoints and Routes Track recording and display Reads navigational data Simulation mode Paid for features (in-app purchases): Open KAP/BSB files Open GeoTIFF files Open Satellite charts Display AIS targets (if AIS information is available) Tidal information for the British Isles Subscription Charts: Charts derived from UKHO data covering the coastal waters of the British isles, the Atlantic coast of Spain and Portugal including the Atlantic islands. SHOM charts of the coasts of France Imray charts of of the Mediterranean, Caribbean, and others Key features: Brand new app written from the ground up Carry out traditional navigation techniques on screen Free to download to for evaluation, with in-app purchases to add only the features required Frequent updates of subscription charts including handling of notice to mariners Custom keyboard for entry of waypoint latitude and longitude Open KPA/BSB and GeoTIFF files (in-app purchase required) Create Satellite charts for off line use (in-app purchase required) Display AIS targets on the chart (in-app purchase required) NOTE: The continued use of GPS running in the background can dramatically decrease battery life

Marine Logbook - Voyage & Fix Logging: Records position fixes, averaged speed, course, and timestamps over the course of a passage. - Observations & Voice Notes: Allows sailors to record voice memos and text notes tied to specific GPS fixes. - Noon-to-Noon Calculations: Calculates traditional passage-making metrics, such as 24-hour day runs (noon-to-noon) and daily distance made good. Live Navigation Instruments - Displays passage data including averaged Speed Over Ground (SOG), Course Over Ground (COG), Velocity Made Good / Velocity Made on Course (VMG/VMC), and range/bearing to destination. - AIS & NMEA Integration: Ingests marine NMEA 0183 data streams and AIS vessel feeds (both local NMEA feeds and internet AIS) to monitor surrounding vessel traffic. ETA windows - Computes ETA estimates based on three velocity calculations. Mapping - Map Views & Waypoints: Plots the voyage track, note markers, and live positions over map layers (including NOAA charts and satellite tiles). Sharing & Passage Data - Standard & Native Exports: Exports trips in standard formats (.gpx, .csv) as well as native Percival voyage backup files (preserving tracks, notes, and voice clips) to share with other crew and sailors.