You can purchase a GPS receiver antenna from a list of electronic venders including: Wal-mart, Sears, Target, and Radio Shack. Remember to always check pricing to ensure you get the best deal.
It depends on what brand of gps you own, and the model fo the gps system which you have to purchase the receiver antenna for; each model will have different costs.
the size of the gps receiver antenna is generally just a few inches high. a website describes it as coffee cup sized or smaller. http://www.hartrao.ac.za/geodesy/slr/files/gps.pdf
You need both a radar antenna and a GPS radar if this is marine then the radar antenna will perhaps include a Receiver and Transmitter as well and the GPS maybe a mushroom shape
For a Garmin Etrex GPS system, a receiver is not required. You can simply just buy a Garmin Etrex GPS and use it without having to buy any other accessories such as the receiver.
There is nothing to set. If the GPS receiver is actually indicating the wrong location ... more than a couple hundred yards/meters from where it really is ... then either the receiver or its installation is defective. -- Find a place that has an open, unobstructed view of a large part of the sky, without a lot of buildings surrounding it. Check the location as indicated by the GPS in that place. If it's wrong, then you have two major things to address: 1). The antenna system. The GPS antenna is somewhere on the outside of the car, and connects to the receiver through a shielded 'coaxial' cable. You have to inspect and verify that the antenna and cable are not damaged. If you can confirm that the antenna, the cable connection to the antenna, the cable itself, and the cable connection to the receiver, are all in good condition, and the receiver indicates the wrong location, then you have identified the problem: 2). The receiver is defective. It's as simple as that. See the dealer for replacement. With a BMW, this should not be a problem.
You would be able to purchase tomtom GPS antennas at radio shack, best buy, target and other electronic stores. You may also be able to find a tomtom GPS antenna at www.amazon.com/tomtom
According to most reviews and ratings by customers and experts, a GPS receiver is a better buy than a GPS cradle. This is true not only for quality but for the price difference as well.
While all GPS systems come with an internal antenna with which it uses to contact the satellites in orbit, there are accessories available. If you buy a antenna attachment, it can improve your signal quality.
If you have a two-frequency GPS receiver with an external antenna and you are on a hill with no trees, the accuracy of your position can be within a centimeter or less. (An area the size of a sugar cube, or less)
You can purchase a gps receiver chip whereever you can purchase a gps system. you can go to walmart, target, best buy, outdoor world, or online as well.
Lowrance GPS antenna is the most desired brand of GPS antenna. They are reliable, and excellent when compared to other brands, and cost the same as the lower quality brands.
The original GPS system was invented and put together by the US military. Orginally, it required huge radio receivers, big power supplies, and substantial antennas.With the miniaturization of electronic parts and computer chips, GPS receivers were invented that put the power supply (batteries) and the radio receiver in a backpack. The antenna became easier to carry, and looked like a saucer on top of a pole.Today, all of the above are so small that they can be put in a tiny space . . . battery, antenna and receiver. This is a 'Stand-alone' GPS receiver . . . it works all by itself and needs no other equipment.