Jammer, we are permanent live-aboards and are constantly sailing the East Coast
including the various (numerous) reef systems. After a (very) long discussion with Raymarine
, Navionics (Product Mgr level) and several interested retailers it has been concluded that:
a. Any uploaded cartography to Navionics will be incorporated into their next 'download' (provided you have a current
b. They may / do not accept 100% of depth variation data (to avoid significant changes occurring due to one false reading I understand);
c. You cannot 'get at' any of your SonarChart (r) data if using iOS. Chart sync etc will transfer it but there is no 'public access' to this file.
Because we are working around significant reef systems; ocean / river bars and generally into tight spots we have forked out the funds for the following system.
A68 Hybrid touch MFD plus a chirp transponder. Sonar Chart logging on; bottom lock and set the transponder depth (-100 mm); tidal adjustment on.
I use a spare 12 V battery
and secure the lot into the dingy (<5 mins).
I have already taken out the current
Navionics chart chip (microchip) and installed it into the A68 when onboard the main vessel so that I don't end up dropping the lot into the ocean.
Turn on track and run around in the dingy (around 9-11 kts) and 'survey' the area. See Navionics FAQ for how to undertake a 'survey' (i.e. the route
your actually cover).
Back on board I simply de-install and then swap out the chart chip back to the Raymarine E7D. I now have networked SonarChart Live(r) data for navigation
. I use it regularly to record
very tight navigation access etc. and/or 'escape' routes if I need to dash in the middle of the night and do not want to follow the inbound tortuous route
(had track on).
This is not the cheapest solution but the cost of running into something is really easily covered. It has allowed us to go into fantastic spots in the reef system and up rivers etc. As always keep Mk1 eyeball on the latest lateral marks but we are heavily reliant on it to keep us floating.