I don't think out on the water counts as poor signal conditions. My Sony android tablet has a built in GPS receiver and runs Navionics perfectly, as does my phone (which has no data plan, hence is not getting a location fix via data).
Do the cheaper iPads not have a GPS chip in them? Graham Collins Secret Plans C&C 35-III #11 On 2019-01-19 12:17 p.m., Jerome Tauber via CnC-List wrote: What this discussion is missing is the distinction between stand alone gps and assisted or augmented gps found in most mobile or cellular devices. Mobile devices having cell service or internet provider can augment gps. If the mobile device has no gps and no cell service it can still get a position from WiFi connection. These are usually called location devices rather than gps and will only work with internet or cell service within range. If the device also has a gps or has external gps access it will work anywhere that gps signals are available which is just about world wide. As long as your charts are downloaded on the device it should work anywhere. The following discussion is from Wikipedia. Standalone/self-ruling GPS devices<https://en.m.wikipedia.org/wiki/GPS_navigation_device> depend solely on information from satellites<https://en.m.wikipedia.org/wiki/GPS_satellite>. A-GPS augments that by using cell tower data to enhance quality and precision when in poor satellite signal conditions. In exceptionally poor signal conditions, for example in urban areas, satellite signals may exhibit multipath propagation<https://en.m.wikipedia.org/wiki/Multipath_propagation> where signals skip off structures, or are weakened<https://en.m.wikipedia.org/wiki/Radio_propagation#Absorption> by meteorological conditions or tree canopy. Some standalone GPS navigators<https://en.m.wikipedia.org/wiki/GPS_navigation_device> used in poor conditions can't fix a position because of satellite signal fracture<https://en.m.wikipedia.org/w/index.php?title=Signal_fracture&action=edit&redlink=1> and must wait for better satellite reception. A regular GPS unit may need as long as 12.5 minutes (the time needed to download the GPS almanac and ephemerides<https://en.m.wikipedia.org/wiki/GPS_signals#Navigation_message>) to resolve the problem and be able to provide a correct location.[2]<https://en.m.wikipedia.org/wiki/Assisted_GPS#cite_note-2> An assisted GPS system can address these problems by using external data. Utilizing this system can come at a cost to the user. For billing purposes, network providers often count this as a data access<https://en.m.wikipedia.org/wiki/Data_access>, which can cost money, depending on the plan.[3]<https://en.m.wikipedia.org/wiki/Assisted_GPS#cite_note-cnet-3> To be precise, A-GPS features depend mostly on an internet network or connection to an ISP<https://en.m.wikipedia.org/wiki/Internet_Service_Provider>(or CNP, in the case of CP/mobile-phone device linked to a cellular network provider data service). A mobile (cell phone, smart phone) device with just an L1 front-end radio receiver<https://en.m.wikipedia.org/wiki/Global_Positioning_System#Satellite_frequencies>and no GPS acquisition, tracking, and positioning engine only works when it has an internet connection to an ISP/CNP, where the position fix is calculated offboard the device itself. It doesn't work in areas with no coverage or internet link (or nearby base transceiver station<https://en.m.wikipedia.org/wiki/Base_transceiver_station> (BTS) towers, in the case on CNP service coverage area). Without one of those resources, it can't connect to the A-GPS servers usually provided by CNPs. On the other hand, a mobile device with a GPS chipset requires no data connection to capture and process GPS data into a position solution, since it receives data directly from the GPS satellites and is able to calculate a position fix itself. However, the availability of a data connection can provide assistance to improve the performance of the GPS chip on the mobile device. Sent from my iPhone On Jan 19, 2019, at 10:56 AM, T power via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: Hi Bruce, I was thinking of using a Samsung tablet also. Do you happen to sail offshore, If so are you still able to run a Nav program in real time when out of range of cell and wifi? Cheers, Tom Power Invictus C&C 30 MK1 Fredericton, NB ________________________________ From: CnC-List <cnc-list-boun...@cnc-list.com<mailto:cnc-list-boun...@cnc-list.com>> on behalf of Bruce Whitmore via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> Sent: Saturday, January 19, 2019 9:43 AM To: Rick Brass via CnC-List Cc: Bruce Whitmore Subject: Re: Stus-List Tablet for navigation Hello all, I am going to mildly disagree with the statements about tablets having to be cellular capable. I have an old (2014) Samsung Galaxy 10.1 tablet that is wifi only, and it has GPS capability that I have used on my boat. So while that statement might be right for other makes and models, it is not correct for my tablet. Kindest Regards, Bruce Whitmore (847) 404-5092 (mobile) bwhitm...@sbcglobal.net<mailto:bwhitm...@sbcglobal.net> _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
