When you switch off cellular on the iPad then the GPS keeps working. If you switch th eiPad into airplane mode then the GPS is off too.
If you have WIFI
on board, such as a Raymarine plotter or a Vesper AIS
, or a router, that your iPad knows, then make sure WIFI
is off on the iPad or it will be so smart to use the WIFI signal as a location to "improve" location services and tell you are where it saw th WIFI a long time ago. For several weeks it kept telling me, when freshly started, that I was in Ft. Lauderdale, when in fact we were 200+ miles away in The Exumas
. The screen
dialog to "switch on WIFI to improve location services" is way wrong if the WIFI location moves.
Using an iPad with a different chart can be very helpful. Navionincs is totally out to lunch in many places in The Bahamas
. We have been through places with our boat where Navionincs says it is only 1 foot deep, yet have run aground in "9-feet" of water
. I also anchored twice in the midlle of a small island while still happily floating.
Whenever it gets tricky and I do not know the waters, then the Garmin
Bluechart application with the iPad is right beside my chart plotter.