Smart phone, Navionics and roaming

[JSK76]

I just came back from the Canada side of LOTW and When I got up there I put my phone on airplane mode so I wouldn't get any roaming charges with text or emails coming in and my Navionics app was showing my position when I first looked at it and then next time I looked it would only show the map and not my position on it. I had the gps toggled on and just was wondering if you have to have the 3G going for Navionics? Strange that it was working for a bit.

On another note I got a temp update with my phone on airplane mode also, which I didn't think was possible.

[fisherman-andy]

Hmmm....

I turn on airplane mode for my iPhone using the Navionics North App and was able to locate myself when I toggled the GPS. I attempted to do the same thing with the new Navionics Marine Lakes App and the same scenario.

Its clear that it caches some data from last use and its possible that the phone may have also retrieved some updates or data before going into Airplane mode but didnt inform you of so until after you checked. Because its push notification its not always delivered to you 100% accurately and on time.

The smart phones are GPS assisted meaning wifi and cellular data will allow the built in GPS to locate you much faster and more accurately. Without the data it should still locate you but will definitely have problems with accuracy but can get close. Any inteference unclear sight with sky will throw you way off.

Some of you should note that the older Navionics Apps stored all its data for lakes in the App on the phones. The newer Navionics Apps does not store or download any lake data or maps until you prompt it to by searching or downloading the map zone via the settings.

Apps that purely rely on data connectivity and dont store its own maps will not work or load any info unless it was preloaded ahead of time. For example the Motion X type Apps requires data connectivity to load its maps for navigating.