Question about Garmin StreetPilot c550 GPS Receiver

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Poor directions For the first couple months, my unit was terrific. I could trust it implicitly to guide me. Lately it has become erratic and I have to check every trip I take. Most of the time it does not provide a 'shortest time'route until I input one or more way points - the last time I did this the time ended up being 30 minutes shorter on a 4 hour route. It also provides a different routing now, for routes traveled a couple months ago. I updated the software, but saw no improvement. Ideas??

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Re: Poor directions

Go to setting (the wrench icon) press it, then look for Navigation, then check Route Preference to see if it is set for either fastest time or shortest distance. If you want shortest distance, the upgrade most likely reset it to Fastest Time (default).

Posted on Jan 18, 2008

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Your electronic compass is probably turned on, and if so, either it is not calibrated or you are not holding the GPS unit level.

Try turning off the electronic compass by holding the PAGE button in for a couple seconds. With the electronic compass turned off, the GPS will instead show direction of travel using the current track, which is probably what you are expecting.


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It sounds like you may have to send it out for service, but before you you do there are a few things you can try.

Low voltage can cause erratic behavior. Since you already wired directly to the battery, check the plug for corrosion.

Try unplugging the transducer cable to see if the display still behaves erratically. You wont see depth readings but you should still see the screen going black. If no erratic behavior with transducer unplugged then problem is in the transducer cable or the plug. A common source of failure is at the plug because the added stress of plugging and unplugging cables can cause the socket to twist slightly which can cause a short.

Make sure you have the latest software update.

How to see if your LCX-19C is already using version 1.8.0 software:
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If it is lower than 1.8.0 you can download the update from this link: LCX-19C UPDATE
Copy it onto a blank MMC card and install it in your GPS. The GPS should prompt you on how to install the update.

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I looked at the manual for your processor, and it looks like it needs the same thing (pg 42 in PDF on Alpine's site)

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