Originally Posted by
PurpleToolBox
The iPad or Surface doesn't have the inertial references calculations or PRAIM to know when it isn't in the correct position. My iPad and iPhone occasionally tell me they're somewhere else when they're not. But the airplane alerts you as soon as it detects a problem and suspects the position is incorrect. Plus those devices only have one GPS receiver.
Well my Bad Elf has never been off by more than a meter or two to my eye. Far faster acquisition and accuracy than my iPhone or iPad (which are awesome but not for this and as you said sometimes think they're collocated at the cell tower if they don't know otherwise).
But I realize technology is getting wayyyyyy ahead of the game. No worries...was just asking the question about SMGCS.