gaffing gps speedo problems

[Richard]

I recently bought a group of used gaffrig gauges including a gps speedo. The previous owner said it was tested ok by gaffrig but needed anew antenna. I fortunately had a new livorsi antenna that I assumed would work. the gauge will acquire a gps signal but will not read more than 5mph. Any ideas.

[FUJIMO]

...hey, those gps speedo's don't lie......

[trivialpursuits]

Is it possible the antenna isn't really compatible?

[Richard]

I thought about that. the livoris and gaffrig both operate on the same frequency. I'm calling gaffrig

[4Speed]

I purchased a brand new Livorsi GPS with antenna in 2016 and it works fine. I called Mike at Livorsi as I wanted their new faster updating GPS unit thinking I would need to change just my antenna. I was told even though my current antenna and head are both 3 wire & both Livorsi... the antennas are not compatible/ interchangeable. I would need to purchase an entirely new head & antenna to get the faster updating GPS Speedo.

[hsbob]

before ordering parts make sure you need an antenna or a stand alone gos [eg garmin 18 ot 35. for these are gps]