I've upgraded the radar on Journey On. I have a few comments on how I made my selection. I bought a Lowrance 3G for the close range, but a Garmin would also work for me. Lowrance=Simrad=B&G, the difference being that the latter 2 come with a NMEA 2000 interface, which I didn't want. Otherwise they're identical
First, I'm tired of the small 7" screens, but for anything else, they want an arm and a leg. A 10" screen costs $2K, without the radar. So I found a site that allows a radar to plug in to a PC:
OpenCPN. OpenCPN is a open source free navigation program for the PC. It's good enough that I've stopped using Fugawi. We've used a PC on board Journey On for years and with the enclosed cabin, the PC has worked with no problem.
So how does it show radar? It turns out that both Lowrance and Garmin have an ethernet connection between the radar and display, with all processing done at the radar and just the picture data sent to the display. And several sailors developed the required OpenCPN software to import either/both Lowrance and Garmin data and overlay it on the chart, as described in the link above. Remember all US charts are free from NOAA. So all you need is the radar, a PC and a GPS
So which one should I pick? They're both about the same price (~$1200.) The only discriminator Is that I figured that Journey On needs good data in close. With the chirp technology Lowrance offers, I felt that it would provide better close in data, both for navigational aids and small boats. Big ships show up on anybody's radar. In addition Lowrance claims that their transmitted power is low enough it's not dangerous to your health.
I also bought a 7" Lowrance HDS Gen 2 display ($740.) No good reason, other than a guarantee that I would always have good nav data. Note that it costs the same as a good PC. Nevertheless, the Lowrance (and Simrad and B&G) comes with US charts from Navico (which owns those brands.) Since I plan to go to Canada, I also need BC charts. Well, the new Lowrance HDS Gen 2 also reads C-Map charts from a SIM card, as well as Navico SIM cards. Jeppson allowed me to trade in my old C-Map charts for a nominal fee. I'm home almost free. The unit also comes with GPS.
So for about $2K I have a complete redundant radar display, 2 complete charting systems and my wide screen. And my JRC radar/chartplotter/GPS is for sale for $450 + shipping, with complete West Coast charts.
A Garmin should be just as good a choice, if you prefer Garmin.
Boris