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$ 19.99

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Free shipping from
3-5 business days
Orders are shipped from our warehouse in the bonded area in Shenzhen, China.
Warehouse opening hours: Monday through Friday, except holidays, from 8:30 – 17:30 CST.

Orders placed before 12:00 (mid-day) will be processed and shipped out the same day. Orders placed after 12:00 will be processed and shipped out in the next business day. Once your package has been processed, it is ready for shipment and you will receive a Shipping Confirmation Email confirming the number of days the shipping carrier needs to deliver your package.

Below you will find an estimate of the number of working days (Mon-Fri) required to ship our products to you. This estimate starts from the moment you receive the shipping confirmation email with your tracking number. Delivery time depends on the delivery location and we will be able to deliver the shipment to most major metropolitan areas within the estimated range, however, to other areas (remote location), in very rare occasions, it could take up to 3 weeks to deliver the products.

There will not be any additional charges as orders are shipped according to Incoterm Delivered Duty Paid (DDP). This means that we collect and pay any import duties that may be charged in designated country of delivery. Any additional import charges will be covered by us for custom clearing in order to deliver your package. Please contact us through the chat or contact form for more information if you are unsure what this means to you.
Delivery Method
DHL Express
Cost
19.99 USD
Delivery Time
2 - 7 business days.
3-5 business days
Free Shipping From
75 USD
Return policy
Of course you can return your Marshall product if you are unhappy. We offer a 30 day return policy to all our customers.

When exercising your right of withdrawal, you as the customer are responsible for the return shipping. The cost of the item will be reimbursed from us.

Read more about our Return policy here.
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Adyen is fully PCI Level 1 (the highest level) compliant and monitored by Trustwave, an ASV and a QSA for the Payment Card Industry Security Standards Council. This means we hold to the highest industry standards for data protection and network security, and card data is safe with us.
Read about our Terms of purchase policy here.

Buying Guide for GPS Units

Buying Guide | GPS Units


Before we dive into the types of navigation systems and buying advice, it's always good to get a little background on the technology and have a basic understanding of how it works. Originally developed in 1973 by the U.S. Department of Defense for military purposes, the NAVSTAR GPS network consists of 30 satellites orbiting the earth every 12 hours, and five ground stations that monitor the satellites' position in space and operational status. To determine your location and other data accurately, such as current and average speed, directional heading, and elevation, GPS devices use a receiver to acquire signals from at least four of these satellites. This is known as a 3D fix and it's why GPS antennas require an unobstructed view of the sky to work correctly.

Armed with your precise latitude, longitude, and other location data, the GPS receiver can overlay this information onto map files stored on the unit, revealing your current position on the map as well as where you've been. Since the receiver is constantly recalculating your position relative to the satellite's position, the GPS unit can track your location in real time. A typical GPS device contains a 12-channel receiver and an antenna to capture satellite signals, and a CPU to process the data. The quality of the receiver and your geographic location will determine how long it takes the device to acquire a 3D fix. For example, it's harder for the receiver to lock onto and hold a signal if you're traveling through a dense forest or an urban area with tall buildings.

The first time you fire up your GPS, it collects certain satellite information to determine your whereabouts. Known as a cold start, the receiver is essentially blank and needs to know what time it is, where the satellites are in their orbital patterns, and where it is in relation to the satellites. Most systems take around one to two minutes to acquire a 3D fix during a cold start, while some can take a few minutes. Thereafter, it can take as little as 3 to 4 seconds to lock in since the unit already has your coordinates and a general location of the satellites. A good receiver will instantly recover from a complete signal loss when you drive through a tunnel, for instance, while weaker units will require more time to reacquire a 3D fix. In some cases, you'll have to stop the car to give the receiver a chance to lock on to the requisite signals.

How well a GPS unit will work in your car depends on the location of the antenna. If your vehicle has a factory installed in-dash unit, chances are the antenna is integrated into the dashboard in a place where it has an unobstructed view of the sky, which is ideal. Many portable models are designed to be positioned directly on the windshield via a suction cup mounting device, giving the antenna a wide sky view. There are also add-on antennas available for GPS units that allow you to keep the receiver close to the front seat for easy viewing without sacrificing signal quality.