Hi - when you say "LAP" I assume you mean laptop or notebook computer. Some computer USB ports do not have sufficient power to charge (or operate) devices like cellphones, GPS, large external hard drives, etc. You may be able to charge if you disconnect all other USB devices that aren't needed to run the computer. In order to get around the problem without having to do all that, either purchase an external charger for the GPS (which may be fairly expensive) or purchase a powered USB hub.
An external powered USB hub looks like a traditional USB hub, except for the fact that it has a power cord to connect to your home power outlets. The power cord will often look like AC adapter. The powered USB hub is ideal because they provide additional USB ports, are fairly inexpensive, they provide all the power for the USB devices that are connect to them (the computer's internal power supply is not used) and it can power or charge devices connected to them
without needed the computer to be powered on. Simply plug the USB hub into a USB port, and AC power source - then connect the devices that need a large amount of power to the hub's USB ports instead of the computer's USB ports.
The parts included with powered USB hub (clockwise from left): USB hub, USB connecting cable and AC power adapter.Many powered hubs will work without the power adapter - however they will supply power to the devices connected from the computer's internal power supply.
I hope this helps and good luck! Please rate my reply. Thank you.
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