![]() Not the end of the world, just not what we would have preferred. ![]() We had no choice but to run on the 1-mile scale. Generally, we would have liked a 3-mile scale, but that chip scale was frequently not available. It’s title tells the tale: “Chicago-to-Mobile.” Second, the chip does not maintain it’s scale as you travel along. First, it did not cover much of the Cumberland and Tennessee Rivers. The “Chicago-to-Mobile” chip, NA-C047, had a couple of quirks. NA-C047.03 – Inland Circle Route: Chicago To Mobile NA-C102.12 – Lake Michigan, Lake Huron, North Channel and Georgian Bay NA-C302.15 – Cape Cod, Long Island Sound and Hudson River (This chip covers the Erie Canal,īoth north into Lake Champlain and West to Buffalo) NA-C324.07 – Sandy Hook, NJ to Wilmington, NC NA-C323.08 – Wilmington, NC to Key West, FL to Panama City, FL The CMAP chips we used for our Great Loop cruise were: They were very useful, and we would not recommend not having them, but we didn’t have to actually rely on them. We always had paper charts for backup, but we never actually had to rely on having paper charts. Except for that 200 miles where we used paper charts, we relied entirely on the Raymarine system as our primary navigation ![]() We used the Canadian Hydrographic Service (CHS) paper charts for the TSW, and they were just fine. That wasn’t because we couldn’t get a C-MAP chip to cover it, but the chip was expensive for the less than 200 miles between other chips, so we just didn’t bother. ![]() The only place we found C-MAP coverage to be problematic was the Trent-Severn Waterway. This system uses C-MAP chips in the form factor of the 1950s and 1960s airmail stamps that is, rectangular in a 1:2 length-to-width ratio. At that time, our primary chart plotter was a Raymarine RL70CRC. Sanctuary and crew completed the Great Loop cruise in 2007. ![]()
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