Quote Originally Posted by Humminbird_Greg View Post
That is the GPS-HS GPS Receiver Rickie.
The GRP GPS Receiver does not have the heading sensor in it.

St041986,
Call Humminbird back and see if they will swap you out with a GR16 which will work with your 728 without a software update.
Yep, Greg is right...(I have the AS GPS HS stuck in my head because it works so well)..

Rickie