NavLink US vs SkunkTracker

Marine Navigation App that turns your Apple Device in to a full function chart plotter. Features include: · Realtime GPS position plotted on Marine charts derived from NOAA data (Vector (ENC) & Raster (RNC)) · AIS overlay when connected to compatible wireless AIS system · Waypoints & routes with full route editing and planning function · Position, COG, SOG, VMG, bearing, distance & ETA displays · Configurable chart layers · HorizonView overlays navaid and targets onto iPad/Phone camera display · Automatic free chart updates included for 1 year · Weather buoy data · A-B chart ruler for quick & easy bearing and distance measurement · All NOAA US charts are included in the price · Optional in-app purchase of CA charts AIS Functionality When connected to an AIS system via a wireless NMEA link, NavLink will provide a real time overlay of AIS targets and CPA and TCPA alarms. Internet AIS requires Boat Beacon app HorizonView Overlay chart & AIS objects on the iPhone or iPad camera image to create an augmented HorizonView display, that makes Nav-Aid & vessel identification simple and reliable Plan & sail routes Instant route and waypoint creation by tapping on screen. Route reverse function and route overview with inter-leg bearing and distance. Share your routes via dropbox and email with other users NavLink Charting NavLink utilises the latest S57 based NOAA digital mapping & features automatic free updates for 1 year. With vector mapping, you can manage your layers of data to de-clutter the screen or maximise information. NavLink supports all key charting feature such as buoys, lights, bridges, depth contours, spot depths, depth contours, anchorage & military areas, weather buoys Interfacing NavLink is compatible with all Digital Yacht's wireless NMEA devices such as the iAIS, WLN10, WLN10HS, NavLink, iNavHub & PilotLink that stream wireless AIS data to your Apple device If you have a WiFi-only iPad you will need an external Bluetooth GPS receiver to enable navigation. 3rd Party units are available such as the Garmin Glo. Please note: Continued use of GPS running in the background can dramatically decrease battery life Subscriptions Your purchase includes 12 months free updates to the included chart set. At the end of the 12 month period continued access to ongoing chart updates is available via an in-app purchase. Charts for other regions may also be added to your product via optional in-app purchase. Our in-app purchases are 1 year subscriptions, which automatically renew at the end of the subscription period unless auto-renew is turned off at least 24-hours before the end of the current period. Payment will be charged to your iTunes Account at confirmation of purchase, and will be charged for renewal within 24-hours prior to the end of the current period. Pricing for our 1 year US Charts update subscription is $9.99. Subscriptions may be managed by the iTunes account holder and auto-renewal may be turned off by going to Account Settings after purchase. 
No cancellation of the current subscription is allowed during active subscription period. Privacy policy:- http://seanav.net/digitalyacht/privacy.php Terms and conditions:- http://seanav.net/dyiostsandcs.php Safety Notice NavLink & the charts are intended to be used as an aid to navigation. Only official government charts and notice to mariners contain all of the current information needed for safe navigation. This product's features cannot be relied on to be complete or accurate and may vary locally. It is the Captain's or Boat Owner's responsibility to use official government charts, notice to mariners, caution, sound judgement and proper navigational skill when operating their vessel and using this or any other Digital Yacht product. By purchasing this App, you are accepting the limitations of this app and the NOAA charts. Third Party Licenses and Notices NOTICE: US Marine Charts are derived from official NOAA Electronic Navigational Charts.

SkunkTracker displays live, updating maps of ships and boats. It uses AIS data streams received over WiFi, either from your own dedicated AIS receivers or from public network feeds such as AISHub.net and MarineTraffic.com. AIS (Automatic Identification System) transponders are carried by all large ships, all passenger vessels, and many recreational boats. Note: you need an AIS radio, or access to a public or private AIS feed, to use SkunkTracker. Your boat's AIS transponder may have a network interface already, and if you can connect to the same network you can use that radio. Your radio can be connected via WiFi or via cellular data. If your radio doesn't have a network connection, we recommend a WiFi-RS232 converter, such as the Global Cache WF2SL or the Grid Connect RN370.