>Not to be picky, but your last step should not be required every time you shut 
>off the power. The settings are retained in non-volatile memory.  

The settings are saved, and should last over the winter. Some of the older 
units are losing their ability to save into non-volatile memory.
Also, I think, if at start up when the non-volatile memory is read if a read 
error or checksum error is detected the unit drops back to defaults.

>NMEA 0183 is essentially a one wire system if you use the 12 volt ground. It 
>has data + and ground, which is 99% of the time common with 12 volt ground. 
 

The spec calls for RS-422, which is a two wire differential signal of +/- 6 
volts. In theory the differential pair could be decoupled from ground, and would
be if someone is using a handheld GPS running on batteries. Likely 99% of the 
time the manufacture is using RS-232 or is coupled to ground. Just
mentioning it for the other 1%, those poor guys that do it correctly and find 
it has compatibility issues.


A further note, if someone in the cabin happens to place something magnetic 
near the fluxgate compass while you are underway with autopilot it can
cause a sudden change in course.

Michael Brown
Windburn
C&C 30-1
_______________________________________________
This List is provided by the C&C Photo Album
http://www.cncphotoalbum.com
CnC-List@cnc-list.com

Reply via email to