Buying guide: GPS units and sat navs

Need help shopping for a GPS unit? Deciding between sat navs from Garmin, TomTom and Navman? Read our handy buying guide

Jargon Busters: GPS units

Atomic clock: Atomic clocks are the basis of a GPS navigation system. The GPS master clocks are atomic clocks at the ground stations, and each of the GPS satellites has an on-board atomic clock.

Geographic location: A geographic coordinate system enables every location on the Earth to be specified by the three coordinates of a spherical coordinate system that is aligned with the spin axis of the Earth.

GPS: GPS stands for Global Positioning System. More than 24 GPS satellites orbit the Earth, transmitting signals that allow GPS receivers to determine the receiver's location, speed and direction.

Latitude: Latitude gives the location of a place on Earth north or south of the equator. Latitude is an angular measurement in degrees, ranging from 0° at the Equator (low latitude) to 90° at the poles (high latitude).

Longitude: Longitude describes the location of a place on Earth east or west of a north-south line called the Prime Meridian. Longitude is given as an angular measurement ranging from 0° at the Prime Meridian to +180° eastward and -180° westward.

MicroSD card: A miniature version of an SD card, most commonly used in mobile phones, smartphones and some portable GPS units.

POI: POI Stands for Point of Interest. A POI is a specific point location that someone may find useful or interesting. The term is widely used in GPS navigation software.

Satellite: A satellite is any object that orbits another object. Satellites can be manmade (such as those used for GPS) or may be naturally occurring.

SD card: SD stands for Secure Digital. An SD card is a flash memory card format developed by Matsushita, SanDisk and Toshiba for use in portable devices. An SD card can be used in a number of digital cameras and GPS units.

SUNA Traffic Channel: The SUNA Traffic Channel broadcasts live traffic information directly to a compatible GPS navigation system. This enables users to be redirected around accidents or traffic build-up.

Touch screen: A touch screen is a display that has the ability to both display and receive information. This allows display to be used as an input device, eliminating the need for physical buttons.

Tags notebooksmobiles phonessat navGPSbuying guidesmartphones

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

GoodGearGuide Staff

Good Gear Guide




GPS maps for Navman iCN320

Need some assistance with map finding for my 2nd hand Navman iCN320. It appears it is an older GPS and I'm not sure what or where I need to be looking to purchase maps for it. I would also like to know what type of maps it would require or what other applications are compatible with it. A comparison site would be good, both listing prices and applications. Please advise.



GPS maps and or applications

I require some assistance with a 2nd hand Navman iCN320 I have purchased. It does not come with maps and I would like some guidance as to what and where to look in order to purchase one. I would like to know what system or applications I need to look for and would ideally like a comparison site for applications, compatibility and pricing if possible. Look forward to a reply.

Brian Garvin


When I was in the military we used GPS systems. Now they are everywhere including vehicles. I'm sure eventually they'll have the technology to plant them in people so they can be located if they are ever lost. That would end up solving a lot of crimes.

Brian Garvin









Which GPS? None of the above!
Navig8r (hard to find) does so much: The major benefits . . .swap out the 4Gb database SDHD card, and watch a movie on one of your other cards to wind down in yr motel, listen to MP3 when you're out of range, verbal directions in an Aussie accent (yah, I can understand it), database maintained in Newcastle, and there are free on-line updates 3-4 times a year, speed/school warnings separate & also updated, big screen for a small screen price.
Only drawback so far: no speed restriction warnings up bush - too many councils not willing to keep others in the loop.

Recommended. About to buy another.

West Marine Coupons


Thanks for sharing such a good opinion, piece of writing is good, thats why i have
read it completely

Comments are now closed.

Most Popular Reviews

Follow Us

Best Deals on GoodGearGuide

Latest News Articles


GGG Evaluation Team

Kathy Cassidy


First impression on unpacking the Q702 test unit was the solid feel and clean, minimalist styling.

Anthony Grifoni


For work use, Microsoft Word and Excel programs pre-installed on the device are adequate for preparing short documents.

Steph Mundell


The Fujitsu LifeBook UH574 allowed for great mobility without being obnoxiously heavy or clunky. Its twelve hours of battery life did not disappoint.

Andrew Mitsi


The screen was particularly good. It is bright and visible from most angles, however heat is an issue, particularly around the Windows button on the front, and on the back where the battery housing is located.

Simon Harriott


My first impression after unboxing the Q702 is that it is a nice looking unit. Styling is somewhat minimalist but very effective. The tablet part, once detached, has a nice weight, and no buttons or switches are located in awkward or intrusive positions.

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?