Review on Humminbird GRP Precision GPS Receiver by Jason Richardson

I bought these to replace the original antenna that came with my 998C SI unit. The antenna stopped working after two years. This new antenna required a software update on the 998C but worked fine after that It was installed on my boat and is now working perfectly The system is receiving a 3D fix quality signal within a few seconds of powering it on It shows my position on the Card close I recommend this product to others July 2014 I've been using this unit for 13 months now Two weeks ago it was working fine but now the 998C doesn't even see it This is an expensive unit when it's only for a month extends the warranty period.