Well, I've used my iPad nav apps for a pair of transatlantic trips and a trip from Acapulco to Florida via the Old Bahama Channel, not to mention quite a few between Canada and New England and the Caribbean, and I have found the GPS to be very accurate...even when I'm below and take it out to check SOG and COG. I have not found the dedicated units to be any better when I've had them side by side at the nav station.
Andy C&C 40 Peregrine Andrew Burton 61 W Narragansett Newport, RI USA 02840 http://sites.google.com/site/andrewburtonyachtservices/ +401 965-5260 > On Oct 3, 2015, at 18:11, Jerome Tauber via CnC-List <cnc-list@cnc-list.com> > wrote: > > OK - This is getting silly. Do you really believe the tiny GPS chip and > antenna in a cell phone or Ipad is going to outperform a dedicated handheld > GPS and pick up signals where the handheld GPS will not without some sort of > assistance. For a navigation message to travel from the satellite to the > receiver, they must be sent on a carrier frequency. In the original GPS > design, two frequencies were utilized; one at 1575.42 MHz(10.23 MHz × 154) > called L1; and a second at 1227.60 MHz (10.23 MHz × 120), called L2. The > satellite output is about 25 watts. These signals are quite weak when they > reach earth and will not penetrate the metal roof on your house or your car > and may be attenuated by the fiberglass roof on your boat to the point where > they may not be readable by an Iphone or Ipad. That's why your handheld GPS > will not work in your basement. The only reason the Ipad or Iphone will > work is that it is assisted. Even it you don't have a cellular connection > you probably have wifi in your house that is being used for the assist. A > typical A-GPS-enabled receiver will use a data connection (Internet, cellular > or other) to contact the assistance server for aGPS information. If it also > has functioning autonomous GPS, it may use standalone GPS which does not > depend on the wifi or cellular network but then must depend entirely on the > GPS signal from the satellite and therefore will not work if that signal is > not strong enough. Some A-GPS devices do not have the option of falling back > to standalone or autonomous GPS. Many mobile phones combine A-GPS and other > location services including Wi-Fi Positioning System and cell and sometimes a > hybrid positioning system. Accurate location requires a fix on at least 3 > satellites, and these signals do not penetrate buildings (even the roof of a > car can attenuate the GPS signal to where it is not useful). So, if you are > not in view of 3 satellites, A-GPS can estimate your location based on 2 > satellites plus cell tower data (less accurate). If you aren't in view of at > least 2 satellites, the iPhone uses internet WiFi or cell-tower > triangulation, which is not very accurate. Jerry > > > -----Original Message----- > From: Rick Brass via CnC-List <cnc-list@cnc-list.com> > To: cnc-list <cnc-list@cnc-list.com> > Cc: Rick Brass <rickbr...@earthlink.net> > Sent: Sat, Oct 3, 2015 3:38 pm > Subject: Re: Stus-List IPad Question... > > I have an IPad 3 which was a gift. It has cellular capability (so it has a > built in GPS), but has never been connected to cellular service. The GPS > function operates perfectly below decks and everywhere else. I have never had > a problem receiving GPS data, even inside my house which has a metal roof. I > can’t say the same for the handheld GPSs (multiple) that I carry on the boat > as backups for the ditch bag. > > I have SKIPPER on the IPad for a navigation app. (Selected that one because > of a desire for Bermuda charts when I was loading the IPad, and Bermuda > region is included as part of North America so there was no cost.) Skipper > uses NOAA charts, and the app checks for NOAA updates to the charts that have > been downloaded to the tablet each time the app is turned on while connected > to WiFi. On the last two deliveries I made, I found that my charts were more > up to date than the charts on the boat’s chartplotter. Plus I run the Active > Captain Companion on the IPad, which gives warnings about hazards to > navigation that are within a specified angle and distance from the boat’s > heading. One of the Raymarine plotters on a boat offered this feature, but > the charts were out of date. The tablet was more accurate. > > If you are getting your AIS information off the net, you should be aware of a > couple of things: The information is not current, not all AIS information is > included, and the AIS repeaters on the Internet have the capability of being > hacked. > > I seem to recall that a number of manufacturers are making instruments and > radios that can be connected to tablets and phones by using Bluetooth. Why > not just use the Bluetooth connection instead of building a WiFi network on > the boat? > > My IPad was a gift, so it cost me nothing. I agree with Dennis. A WATERPROOF > and shock resistant Galaxy tablet is a bit more than $250, but still less > than half the cost of an IPad. Plus the software is generally less expensive. > I have more invested in the Otter Box and LifePruf cases for my IPad than a > galaxy tablet would have cost me. > > But the discussion started with David’s question about using an old IPad for > a plotter. If the IPad had cellular capability (so it has a GPS) go for it. > You will spend something up to $50 (and maybe less) on chart plotter software > and charts, and most of the other navigation apps you will want like Active > Captain and Drag Queen are free. If no built in GPS, put your music on the > IPad and buy a Galaxy tablet with cellular capability. > > Rick Brass > Washington, NC > > > > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Jerome > Tauber via CnC-List > Sent: Friday, October 02, 2015 11:27 AM > To: cnc-list@cnc-list.com > Cc: Jerome Tauber <jrtau...@aol.com> > Subject: Re: Stus-List IPad Question... > > GPS built into phones and pads is limited and depends on cellular service > being available. Moreover, reception below decks is poor to non-existent. > Also, with wifi you can transmit AIS and any other NMEA info such as wind > speed, depth, and even radar. It's a different ballgame entirely. You > can even receive on multiple Pads and from anywhere on the boat. Your Ipad > or Android becomes a complete navigation system using an app such as INavx > and is available anywhere on the boat. Of course, you must have nmea sensors > to plug into the wifi router. Jerry J&J > > > > -----Original Message----- > From: Dennis C. via CnC-List <cnc-list@cnc-list.com> > To: CnClist <cnc-list@cnc-list.com> > Cc: Dennis C. <capt...@gmail.com> > Sent: Fri, Oct 2, 2015 11:17 am > Subject: Re: Stus-List IPad Question... > or you can buy a 10" Samsung Galaxy Tab with GPS for $250. Add Navionics for > $10. Poof! Chartplotter. > Dennis C. > > On Fri, Oct 2, 2015 at 10:08 AM, Jerome Tauber via CnC-List > <cnc-list@cnc-list.com> wrote: > I have been looking into this and there is an excellent solution. You can > plug your onboard GPS into a wifi transmitter and receive the signal anywhere > on your boat on your Ipad. This is compatible with INavx and other > software. You can also transmit AIS if you have an AIS receiver and receive > it on the Ipad (or any Android device) through INavx or other software. > This is the future of onboard navigation. Here are some transmitters though > there are many others. Jerry - J&J > > > > > > > > Digital Yacht NavLink NMEA 200 Wireless Data Server > by Digital Yacht > > List Price: $833.92 > Price: $495.77 > You Save: $338.15 (41%) > Ships from and sold by OJ Commerce. > > > > > > > > > > Digital Yacht NMEA to Wireless Wi-Fi Adapter - 4800 Baud > by Digital Yacht > > List Price: $458.92 > Price: $280.37 > You Save: $178.55 (39%) > Ships from and sold by OJ Commerce. > > > > > > > > > > 1 - Digital Yacht iNAVConnect Wireless Wi-Fi Router > by Digital Yacht > > Price: $232.67 > Ships from and sold by TheFactoryDepot. > > > > > > -----Original Message----- > From: David via CnC-List <cnc-list@cnc-list.com> > To: CNC CNC <cnc-list@cnc-list.com> > Cc: David <davidrisc...@msn.com> > Sent: Fri, Oct 2, 2015 10:37 am > Subject: Stus-List IPad Question... > OK...so I have this IPad I never use. I'm thinking good for chartplotting > software for the 2X (maybe) a year that I need a chartplotter. > > Needs a GPS. I shop and see "Bad Elf"s" for $150+. Huh? I bought a GPS > dongle for my laptop for $20. Is this more of Apples proprietary product BS? > > (sorry Apple users...I am not a big fan of Apple) > > Are there other solutions this non-tech, non-Apple guy could use? > > Thank in advance! > > David F. 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