We were one of the earliest adopters (first week out last August) of the Vesper Cortex. I can say without a doubt that Vesper is one of the best companies from a customer service
standpoint that I have worked with. They were responsive to every issue we encountered and updated the software
several times a week during the first few months. They continue to add functions and improve the unit every month now. It’s been an amazing addition to our boat
. They asked me to be a beta tester, which I’ve been doing. They take our suggestions and keep implementing them. Very nice!
As to GPS antenna, I would recommend external. We already had two GPS antennas on our rear arch (we have a Manta
Catamaran). We didn’t want to run another GPS antenna to the arch which is a 50 foot run, so I placed on cabintop next to outside helm
station. Works perfectly!!
We also added the external cellular antenna and placed it above our indoor navigation
table next to the Lexan
forward port side window. Has worked perfectly there.
We also just replaced our old (21 years) basic Shakespeare antenna and cable with a Morad antenna tuned to both VHF and AIS. We are currently at a marina but immediately improved our VHF reception
Good luck. Happy to Highly recommend Vesper.