Amazon.com: Dual Electronics XGPS150 Universal Bluetooth GPS Receiver for iPad 2, iPad, iPod touch, iPhone and Other Smartphones, Tablets and Laptops (Discontinued by Manufacturer) : Electronics
Garmin GLO 2 iPad and Android GPS
Navigating by iPad with the Bad Elf GPS - boats.com
Bad Elf Pro GPS receiver bluetooth IPAD/IPHONE Bad Elf - Pilotshop
Dual XGPS150 Bluetooth GPS for Apple iPad & iPod: Hardware @ gpscity.com - YouTube
Dual XGPS160 SkyPro Bluetooth GPS Receiver - Pilot Outfitters