Since it was totally illogical to leave GPS out of the 70b (or the 43 as well) I decided to look for a nice Bluetooth GPS receiver that was small and cheap. This is what I found and it works perfectly. The size of a cig lighter and only 29 bones from an eBay seller. Here's a review of the product: http://www.pocketgpsworld.com/tomtom-bt-gps-mkii.php
Its a 7 year old model but nevertheless it works like a gem. Now my 70b and my 43 are GPS units.
I bought 2 from this bloke.http://www.ebay.com/itm/251207791832?ss ... 1439.l2649