mobile phone GPS capabilities VS. Garmin Nuvi 750, TomTom GPS models. you may want to know about using phones as car navigation? How good are they at pedestrian navigation? compared to the Garmin Nuvi series.
Phones can be used for car navigation but they are not as accurate as a stand alone device like the garmin Nuvi. Another drawback is the small screen. Nothing beats a dedicated navigation device. I have an Apple iphone 3G and it has a GPS system that is identical to that of a Garmin or …

A GPS beginners guide/mannual help you know more about GPS:

what is gps
what is Differential GPS (DGPS)?
What is aGPS?
what is gps wass(gps wass definition)
how does gps wass work
GPS receivers accuracy comparison
GPS chipset comparison
GPS receiver drawbacks
what is GPS Utility
how to install gps utility
how to use GPS unit
New GPS Receiver Initialization
GPS power supply and GPS battery capabilities
GPS no signal problem

New GPS Receiver Initialization. When your GPS unit is turned on for the first time, it does not know where it is, the date or the time. To initialize a GPS unit is to basically tell the receiver where it is, what the date is, and what the time is. This allows it to know which satellites should be overhead, so it can start searching for them to lock onto them. When a new GPS receiver is first powered-up, even if it is not initialized, it can still determine its …

how to use mobile phone with a TomTom gps navigation device. Many TomTom gps navigation devices can connect to a Bluetooth-enabled mobile phone,like iphone, BlackBerry,nokia,samsung, htc,etc. you can enjoy hands-free calling, SMS messaging, direct calls to POI’s & emergency numbers, TomTom services like traffic, weather & buddies and more.To use TomTom gps Services, your mobile phone needs full GPRS, EDGE or UMTS. as I know, tomtom provide three service: TomTom MOBILE 5 ,TomTom MOBILE and TomTom NAVIGATOR 6 for popular mobile phones.

GPS no signal or it take GPS time to find a signal, these are two major problems when we use GPS device. Many factors will affect GPS receivers to receive satellite signals. some barriers or parking deck will interrupt GPS to start receiving a signal. like:
Method (code) to identify each satellite.
The location of the satellite or some information on how to determine it.
Information regarding the amount of time elapsed since the signal left the satellite.
Details on the satellite clock status, etc.
Most GPS receivers allow you to set up a margin …

How to make Garmin GPS to speak street names.if your Garmin Nuvi 255 does not speak the street names during the real time travel directions, you can update it. For example, it says “Turn left in 500 feet,” if you have the old gamrin nuvi, you need upgrade to a Garmin Nuvi 350 or 360 (older models), or 205 0r 255 (newer models). for example If you purchased a Garmin Nuvi 360 gps, you can make it speak and say the street names with simple steps: …