Is there an app that would allow the use of an external GPS on the iPad?

Most of the time we are working in a zero mobile coverage area. We need to scout and report back on observations on trips that could amount to hundreds of km's. Yes, we can use normal GPSr's but their screens are small and limited. Having the same GPS plugged in to a MBP and using a Windows program allows us to do on screen marking of observations (normally saved as waypoints).

BUT, if this ability would be available on the iOS platform, especially on iPad, it would be a labour saving device par excellence! Small, light, long battery life, on screen keyboard, etc, are all benefits that could be derived from using the iPad.

iOS developers - please see if you could fill the gap .............