I just bought a Bad Elf GPS pro -https://www.amazon.com/gp/product/B008VWNBBE/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
Bluetooth connection to IOS -- iPad, iPhone, iPod can connect to up to 5 devices at once -- also seems like it has better battery life than the one linked above
I've only played with it a little, going to download the free 1 month trial of Gaia pro very soon
The bad elf app does have a useable offline street map too -- I'm not sure how much is available offline but it worked for the few miles I tried it
