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Garmin sat-nav

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Garmin sat-nav

Old 20th Jun 2019, 06:21
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Garmin sat-nav

How does it know that it's not a Garmin lead? I bought a two metre lead for my lucscious lady friend's unit to enable me to run a neat length of wiring. Upon firing it up a message appeared on the screen. "Please use the lead supplied, this lead will not power the unit". Eh?
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Old 20th Jun 2019, 06:37
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Don't know but I reckon the same applies to iPads. SWMBO's lead finally succumbed where it exits from the plug. Being a tightwad I bought a compatible lead rather than pay Apple's ridiculous price for an original. While waiting for it to appear I bodged a repair on the original. Using the "compatible" lead it takes about 48 hours to charge, using the bodged original takes about 8. WTF?
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Old 20th Jun 2019, 06:59
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Apple use resistors inside the USB connector on their charge lead, so that the device recognises that the cable is a genuine Apple one:Apple and other USB charger secrets |

Maybe Garmin do something similar.
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Old 20th Jun 2019, 07:56
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The normal output in USB is 5v. A car delivers a nominal 12v. My Garmin lead is hard wired in my car. On a hire using one lead it would not charge which is what you discovered. On another it did.

Maybe it has protection circuits.

Try https://www.pocketgpsworld.com and post your question in the Garmin forum. They are also very helpful about map updates etc. I have yet to get a message from Garmin that new mapping is available. I downloaded the new EU maps on Saturday; they had been released on Friday.
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Old 20th Jun 2019, 07:56
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I've found that too with a Garmin

If I can't use the original "cigarette lighter" plug the unit either won't power up or just go into "connected to a computer to perform upgrade" mode

Infuriating
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Old 20th Jun 2019, 11:23
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There are two types of USB cable, those that charge and those that do not, make sure you buy the correct one.

here is the blurb

https://www.focusestech.com/what-is-...ing-cable.html
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Old 20th Jun 2019, 11:41
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On seeing this post, I got my Garmin out and plugged into a non-Garmin lead...
although its not showing on my computer, its charging!...UPDATE..it showed on my PC after about 3 minutes..
I used to own a Blackberry phone, and that was very particular about its charging lead...some would some wouldnt...
Try another one, from a different source...
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Old 20th Jun 2019, 12:50
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Originally Posted by VP959 View Post
Apple use resistors inside the USB connector on their charge lead, so that the device recognises that the cable is a genuine Apple one:Apple and other USB charger secrets |

Maybe Garmin do something similar.
That info is 9 years out of date, and applied to the 30 pin dock connector.
It doesn't apply to the current Lightning or USB-C leads...

I use Amazon Basic Lighning leads, work fine...
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Old 20th Jun 2019, 13:46
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Aren't stand-alone satnavs rather obsolescent now? A good navigation app e.g. TomTom running on a smartphone does the job equally well.

(I could have specified an optional satnav built into my car, but the costs of purchase and map updates were ridiculous)
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Old 20th Jun 2019, 14:15
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Originally Posted by Nige321 View Post
That info is 9 years out of date, and applied to the 30 pin dock connector.
It doesn't apply to the current Lightning or USB-C leads...

I use Amazon Basic Lighning leads, work fine...
Just checked a six month old iPhone SE. That seems to have the USB D+ and D- lines shorted together to indicate to the phone that it's a genuine Apple lead/charger, so it seems that Apple are still doing a variation of this. A quick look around shows that other manufacturers seem to have their own variation on using the unused USB data pins to signal to their equipment too.

Edited to add:

Just found the standard for USB charging leads, and the variations from a couple of different manufacturers. Looking at this diagram it seems that Apple have now adopted the "dedicated charger" configuration, with D+ and D- shorted and connected to +5V and 0V with high value resistors:


Last edited by VP959; 20th Jun 2019 at 16:32. Reason: Added info
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Old 21st Jun 2019, 12:15
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SA - data limits!
I had this issue with a Garmin satnav recently: thought it was just me being old, dumb and forgetful. Switching it off and on seemed to do it.
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