Hello again Adam, cracking introduction
That F-Rib will bloody fly with that amount of power
Sounds like you have the perfect boating life on your doorstep there.
The sonar you refer to, I use a system on my iOS devices, navionics maps give you a pretty good idea of what's around, but if you go sonar, the detail is unbelievable, so long as that area has been navigated and shared by other sonar users on navionics. I use the vexilar fish finder system with a transducer that gives live detail of what's below you, once you've covered the poorly charted area, you then have an in depth chart, connect to navionics website, upload the chart and everyone gets to see your in depth chart.

Don't make the mistake I did.. And get
The device your viewing the data on MUST be a cellular device, if you have just a wifi iPad, your location will NOT show up!
Also, the iPad maps at £45 ish will not transfer to your phone like normal iOS apps, so buy the correct maps for your device.
I did a small page on here whilst I was thinking about buying the system,

->
http://f-ribsandsibs.com/viewtopic.php?f=13&t=239 have a read through
Hope I've explained that well enough
Pm me if you need any details
Regards,
Martin
