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post #7 of Old 02-04-2013
MarkSF
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Re: NMEA 2K Network Problems (Garmin GMI 10/Airmar DST800/GPS 19X (NMEA0183))

I suspect that the depth is dropping out because it is genuinely not getting a reflection off the bottom. This could be because you are in very deep water (but it is unlikely that your slip is more than 200ft deep ) or, more likely, because you have marine growth around, or even inside, the through-hull.

I had a problem with speed always reading zero on my DST800, and it was marine growth jamming the paddle. I now have a round foam dish scrubbing brush, bought from the supermarket, that fits nicely down the through-hull. I give it a scrub now and then.

When was your bottom last cleaned? Even if it was cleaned recently, they can't reach inside the
through-hull.

Word of warning for later when you install the wind instrument : they normally have a terminating resistor, so get installed on the END of the network (in place of one of the terminators) - NOT as a drop.

Bristol 31.1, San Francisco Bay
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