Strange GPS behavior

[Silver Duck]

Every so often, the display on my Standard Horizon CP175C reverts back to the image it would have if I didn't have my C-Map chip plugged in.

It seems like the only way to restore the detailed display image provided by the C-Map chip is to zoom out to a range where the chip image wouldn't be used, then zoom back in.

I've tried powering down and back up to reboot, and that does not fix the situation, so I don't think that it's being caused by a bad connection.

I've also tried removing the chip and re-installing it, both in the same slot and in the second slot, and that doesn't fix the situation, either, so I don't think that it's being caused by a loose chip connection.

Also, mechanical vibration doesn't seem to be the cause, since this occurs even when at anchor.

Does anybody have a feel for whether this is a problem with the GPS, a problem with the chip, or just normal behavior? (I'm fairly certain that I saw a dockmate's CP180 do the same thing).

I'd like to get this taken care of over the Winter, if there's anything that can be done about it, but I don't know whether to send the GPS for service, or the chip for replacement!

Thanks for any advice,

Silver Duck

 

[L Hall]

There are updates for that unit. Make sure you've downloaded them all. And I'd call Standard tech support - they may have experienced similar behavior. I doubt if it's the cartridge. Not much going on there but memory storage.