I have a Lowrance GPS that I purchased July of last year.
I also installed a radar system about 8 months ago.
The problem that I was having was when I turned on the radar I would loose the GPS. I worked with both Fishermans Marine and with Rogers Electronics who both stated that this was a fault with Lowrance equipment and that I needed to get the GPS antena as far away from the radar as possible. I ended up with the GPS receiver about 4' above the radar and still continued to have periodic problems. Last week I was informed that Lowrance has fixed their problem with a new antena that is shielded against radar.
I got hold of Lowrance who informed me that the new antena has only been out for a couple of weeks but if I returned mine they would swap it for the new one. I appreciate their help and customer service. I was just about ready to go with another brand. Just posting this in case any of you are having the same problem and have not been able to resolve. Contact Lowrance