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GPS trackers show you the best routes to avoid traffic congestion. They also prevent you from getting lost by giving you directions to your destination. Interested to learn how GPS works? Read on below to find out.

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Garmin Oregon 650
HK$ 3,822.00 HK$ 3,902.00
BigBigPlace

Garmin Oregon 650, NMEA 0183, 7.62 cm (3"), 240 x 400 pixels, TFT, 63.5 x 38.1 mm (2.5 x 1.5"), microSD (TransFlash)

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Garmin GPSMAP 64s
HK$ 2,741.00 HK$ 2,799.00
BigBigPlace

Garmin GPSMAP 64s, World, 2D/3D, 6.6 cm (2.6"), 160 x 240 pixels, TFT, Vertical

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Garmin eTrex Touch 35
HK$ 2,879.00
Onsport

Garmin eTrex Touch 35, Eastern Europe, 6.6 cm (2.6"), 160 x 240 pixels, TFT, 65536 colours, MicroSD (TransFlash)

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Garmin eTrex 30
HK$ 2,599.00
BigBigPlace

Garmin Etrex 30, 5.59 cm (2.2"), 176 x 220 pixels, TFT, 43.2 x 35.6 mm (1.7 x 1.4"), 65536 colours, Handheld

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Garmin eTrex Touch 25
HK$ 2,327.00
Onsport

Garmin eTrex Touch 25, Western Europe, 6.6 cm (2.6"), 160 x 240 pixels, TFT, 65536 colours, MicroSD (TransFlash)

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Garmin Approach G8
HK$ 3,247.00
Onsport

Garmin Approach G8, 7.62 cm (3"), 240 x 400 pixels, TFT, 38.1 x 66 mm (1.5 x 2.6"), Handheld, Black

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Personal Mini GPS Trackers Locator for Kids Chidren Pets Cats Dogs Vehicle With Google Map SOS Alarm GSM GPRS Tracker
HK$ 313.00 HK$ 392.00
Mini In The Box

What's in the box:GPS Tracker1; Function:Electronic Fence,SOS,Vibration Alarm,Over Speed Alarm,Geo Fence Alarm,Location Record; Compatibility:Car Anti Theft,Pet Anti Lost,Child Anti Lost; Product type:GPS Tracker; Net Weight(kg):0.3; Network type:GPRS,GSM

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−61%
Tidebuy T58 Smart Watch Phone Support GSM GPS Tracker SIM Card for Teens
HK$ 360.00 HK$ 924.00
Tidebuy
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TK102 GPS Tracker Real Time Universal GPS/GSM/GPRS Tracking Device
HK$ 105.00
Zapals

The K102 GPS Tracking device has been designed for advanced tracking and monitoring methods.

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A9 Mini GPS Tracker Anti-lost Locator with SOS Panic Button
HK$ 197.00
Zapals

The miniature size of the A9 Mini GPS Tracker enables it to easily be carried anywhere at anytime to keep track of your valuables.

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−33%
Q50G GPS Tracker Watch Children Safety Monitoring Portable GPS Intelligent Smart Watch Telephone Built-in Battery
HK$ 180.00 HK$ 270.00
Mini In The Box

Model:Q50-G; Languages:Multi-language,English; What's in the box:1 USB Cable Lead,1 Operation Manual; Rom:128Mb; Screen Type:LCD; Sensor:Gravity Sensor; Supported Operating Systems:Android; Connection:Bluetooth; Standby Time (hrs):72-100; Capacity (mAh):400-450; Type:Smart Watch; Material:ABS,Silicone; SIM Card Type:SIM Card; 2G:gsm (850/900/1800/MHz); Fitness Wellness:Sleep Tracker,Activity Tracker,Call Reminder,Pedometer,Alarm Clock; Cpu:mtk6261; Ram:128Mb; Charging Time(h):2; Waterproof Level:IP67; Features:Multi-functional,GPS; Listing Date:11/22/2017; Production mode:External produce; Instructions:English

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−48%
Caterpillar Pets Dog GPS Collar / GPS tracker Mini Bluetooth Wireless Smart Anti-Lost GPS Electronic/Electric Bluetooth 4.0 Solid Plastic White
HK$ 40.00 HK$ 76.00
Mini In The Box

Type:GPS Collar / GPS tracker; Material:Plastic; Function:Bluetooth 4.0,Smart Anti-Lost,Mini,Bluetooth,Electronic/Electric,GPS,Wireless; Compatibility:Dog,Pets,Cat; Item Type:Button Battery; Pattern:Solid; Net Dimensions(cm):531; Listing Date:10/08/2016

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−39%
Caterpillar Dog GPS Collar / GPS tracker Wireless GPS Electronic/Electric Bluetooth 4.0 Solid Plastic Black Green Blue Pink Black
HK$ 47.00 HK$ 79.00
Mini In The Box

Type:GPS Collar / GPS tracker; Material:Plastic; Function:Bluetooth 4.0,Electronic/Electric,GPS,Wireless; Compatibility:Cat,Dog; Pattern:Solid; Net Dimensions(cm):3.630.7; Listing Date:10/08/2016

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Portable GPS Tracker Tracking Device Positioning Travel Keychain Outdoor Hiking Climbing Outdoor Sports Handheld Keychain
HK$ 164.00
Zapals

Tiny and lightweight, this professional GPS receiver is designed for outdoor sports.

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−23%
Mini Global GPS Tracker Real Time Locator LBS/GSM/GPRS 4 Bands Tracking Anti-theft for Car Vehicle
HK$ 102.00 HK$ 133.00
Mini In The Box

What's in the box:GPS Tracker1; Powered by:Power Supply; Function:Vibration Alarm,Main Power Off Alarm,Location Record; Product type:GPS Tracker; Net Weight(kg):2.6,0.26; Listing Date:05/30/2016; Network type:GPRS,GSM

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−23%
JSBP 520 GPS Tracker Kids watch for Girl Boy Student Child Smart Wristwatch Location Device SOS Call Alarm Smartwatch for IOS Android
HK$ 141.00 HK$ 184.00
Mini In The Box

Model:JSBP520; Languages:Multi-language,English; What's in the box:Body,Charging Cable,User manual - English; Screen Type:LCD; Sensor:Gyro Sensor,Gravity Sensor; Supported Operating Systems:IPhone,Android,iOS; Connection:2G,WIFI,Bluetooth4.0; Standby Time (hrs):150-200; Capacity (mAh):350; Type:Kids' Watches; Material:Silicon; SIM Card Type:Micro SIM Card; 2G:GSM(850/900/1800/1900MHz); Fitness Wellness:Pedometer; Cpu:mtk6260; Charging Time(h):1; Waterproof Level:IPX-1; Brand:JSBP; Features:Information,Pedometers,GPS,APP Control,SOS,Hands-Free Calls; Listing Date:10/17/2017; Production mode:External produce; Talk time(h):5; Instructions:English

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Mini SPY GPS Tracker Car Vehicle Anti-Lost Tracking Alarm Locator Device
HK$ 384.00
Tomtop

Mini SPY GPS Tracker Car Vehicle Anti-Lost Tracking Alarm Locator Device

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Mini Portable GPS Tracker Long Time Standby Waterproof IPX6 GPS Tracking Device
HK$ 292.00
Zapals

Portable and fashionable design, super mini GSM tracker, fast positioning, low-power chips design.

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Guaranteed Waterproof Car GPS Tracker
HK$ 108.00
Zapals

24 hours providing car position, driving direction, driving speed and mileage information.

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−33%
GPS Tracker Watch Bracelet for Elderly Mobile App Google Map Call Button Take-off alarm GSM GPRS Tracker
HK$ 306.00 HK$ 462.00
Mini In The Box

What's in the box:GPS Tracker1; Function:SOS,Geo Fence Alarm,Location Record; Product type:GPS Tracker; Brand:lekemi; Net Weight(kg):0.04; Listing Date:11/07/2017

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GSM Real Time Tracker Mini GPS Tracker Quad Band GPRS Tracking SOS Communicator
HK$ 315.00
Zapals

Portable and fashionable design, super mini GSM tracker, fast positioning, low-power chips design.

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Mini A8 Global GPS Tracker Locator Gsm/gprs 4 Bands Tracking SOS Button for Cars Kids Elder Pets
HK$ 118.00
Tomtop

Features:Mini global Gsm/gprs real time GPS tracker, use standard GSM SIM card (Not included).GSM Frequency suppport 850/900/1800/1900Mhz.Location Inquiry: If no one is authorized, any mobile phone can send DW to check the tracker's location (you will receive a SMS with address or Url). Once any authorization is done, only the authorized users are able to obtain the location info.Platform Inquiry: Authorized mobile numbers can use the device ID and password in the authorization message to login the platform and query the position/path/electric quantity, etc. Also, users can go to //e5ex.com to download APP.Voice Callback: Call the SIM card number in the tracker, hear the sounds for 3s after get through, then hang up, and the number is set successfully. When there is a sound above 45db within 10 meters around the tracker, it will automatically call the number which you set before.Emergency Alarm: Send SOS to the device, once it is set successfully, press SOS key for more than 3 seconds, the device will call the set number directly.Maximum 4 cell phone numbers are allowed to admin the tracker.Mini size and ultra light weight.Simple operation and stable performance.Built-in rechargeable Li-battery, low power consumption and long standby time.Widely used for household monitoring, children/the elder/pets' care, the trace for cars or other possessions.

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iPS 1.44'' Touch Screen Smart Watch Kids GPS Tracker Anti-lost SOS Children Smart Bracelet Finder Remote Safety Monitor Flashlight
HK$ 196.00 HK$ 265.00
Mini In The Box

Model:iPS-16G; Languages:Chinese,English; What's in the box:Body,1 USB Charging Cable,User manual - English; Screen Type:OLED; Sensor:Finger sensor,Gyro Sensor,Accelerometer,Gravity Sensor; Supported Operating Systems:Android,iOS; Connection:Bluetooth2.0,USB; Standby Time (hrs):72-100; Capacity (mAh):400; Type:Kids' Watches; Material:ABS,Silicone; SIM Card Type:Micro SIM Card; 2G:gsm (850/900/1800/MHz); Fitness Wellness:Calendar,Alarm Clock,Find My Device,Sleep Tracker,Activity Tracker; Cpu:mtk6261; Ram:128Mb; Charging Time(h):2.5; Waterproof Level:IPX-1; Features:GPS,Anti-lost,Message Control,Hands-Free Calls,Distance Tracking,Pedometers,Long Standby,Touch Screen; Listing Date:03/06/2017; Production mode:Self-produce; Talk time(h):2

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Mini GPS Tracker Portable Keychain Locator
HK$ 235.00
Tomtop

Features: Fit for:climbing/hiking/camping/cycling/outdoor sports Provide accurate speed measurement. Provide the direction and distance to the destination. Provide current position: longitude, latitude, and altitude information. Display accurate time synchronized by satellite . Built-in lithium-ion battery. Mini shape design, easy to carry.

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Mini GPS Tracker Waterproof Smart Location Free APP for Kids
HK$ 242.00
Tomtop

Features: SMS and Gprs dual mode or switch; Real-time location tracking. Vibration alarm, handset search function and cross-border alarm. Electronic fence, you can set a fixed area, it will alarm if one is beyond this fixed area. SOS alarm: Press SOS once you are in emergency, it will alarm by sending message to the authorized number. Overspeed alarm: You can set up a speed range to monitor the target. It will alarm if the target speed is over the set speed.

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−25%
YY D69 Mini Pet GPS Tracker for PET Dog GPS Tracker Locator WiFi Anti-lost GSM GPRS Locator
HK$ 274.00 HK$ 370.00
Mini In The Box

Model:YY-D69; What's in the box:Body,User Manual; Connection:other; Voltage (V):5V; Type:Bread Makers; Style:Animals; Material:ABS; Features:GPS Watch; Listing Date:12/28/2017; Production mode:External produce; Instructions:English

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GPS Tracker Smart Watch Phone Call SOS Wristband GSM WiFiLBS Wristwatch Intelligent Monitor Alarm for Kid Elderly
HK$ 313.00 HK$ 407.00
Mini In The Box

Model:T58; Languages:Multi-language,Simplified Chinese,English; What's in the box:Body,Charging Cable,English and Chinese Manual; Screen Type:OLED; Sensor:Gravity Sensor; Supported Operating Systems:Android,iOS; Connection:Bluetooth4.0; Standby Time (hrs):>480; Capacity (mAh):500; Type:Kids' Watches; Material:Silicone; SIM Card Type:Micro SIM Card; Fitness Wellness:Call Reminder,Alarm Clock; Features:APP Control,SOS,Electronic Fence,Hands-Free Calls,Distance Tracking,Long Standby,GPS; Listing Date:09/10/2017; Production mode:External produce; Instructions:English

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Mini Waterproof Pet GPS Tracker
HK$ 290.00
Tomtop

Features: SMS and Gprs dual mode or switch; Real-time location tracking. Vibration alarm, handset search function and cross-border alarm. Electronic fence, you can set a fixed area, it will alarm if pet is beyond this fixed area. Shift alarm: The tracker will set up defense when it stops. Once it is shifted, it will alarm by sending message to the authorized number. Overspeed alarm: You can set up a speed range to monitor the target. It will alarm if the target speed is over the set speed.

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Tencent Kids Locator Q7S-06 Portable Mini GPS Tracker SOS Button GEO-Fence Alarm GPS LBS WiFi 3 Ways Accurate Positioning for Kids
HK$ 332.00
Tomtop

Features: Wide Using: Suitable for kid, elder, pet, car and package. After School Monitoring: Tracking your kids, see them walking on map, safe and convenient. SOS Button: In case of emergency, elders and kids can press SOS button, preset phone number will be connected automatically. 3 Ways Accurate Positioning: LBS+GPS+WiFi three ways accurate positioning, Tencent kids locator auto adopts quickest locating mode according to environment. GEO-Fence Alarm: Your phone will alert when pets out of the circle on map. Easy Operation: Operates only on smartphones, simple and convenient operation, no SMS commands. Long-lasting Battery: 500mAh big battery capacity, smart auto saving power, offers about 7 days long life standby.

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Mini GPS Tracker Real Time Monitoring System for Car Motorcycle Truck
HK$ 159.00
Tomtop

Features: Obtain location information via SMS or Gprs. Real-time tracking, upload location information intelligently (support for Android IOS web system). Historical trajectory can be checked for six months. Built-in vibration sensor, realization vehicle anti-theft intelligently. ACC the ignition signal detection, vehicle status prompted; Multiple electronic fences can be set.

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Bicycle Luggage GPS Tracker Anti-theft Car GPS Supplies Real Time Tracking Device GSM Alarm Locator
HK$ 188.00 HK$ 286.00
Mini In The Box

What's in the box:GPS Tracker1; Function:Electronic Fence,Vibration Alarm,Geo Fence Alarm,Location Record; Compatibility:Car Anti Theft,Pet Anti Lost; Product type:GPS Tracker; Net Weight(kg):0.018; Listing Date:11/20/2017

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GPS Tracker Digit Portable Anti Lost Reminder Multi-function For Kids For Dog / Cat Luggage Accessory For Wallet Luggage Key Kids Pets 1
HK$ 102.00 HK$ 274.00
Mini In The Box

Category:GPS Tracker; Gender:Unisex; Supported Operating Systems:iOS,Android; Connection:Bluetooth4.0; Activity:Travel,Outdoor; Quantity:1 pc; Shape:Square; Power Supply:Battery; Primary Application:Pets,Kids,Wallet,Key,Luggage; Function:Anti Lost Reminder,Multi-function,For Kids,For Dog / Cat,Luggage Accessory,Portable; Standby Time (hours):4-6; Net Weight(kg):0.01; Listing Date:09/23/2016

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Accurate GPS Tracker Locator GPS Personal Locator TK102b Smart Positioners
HK$ 157.00 HK$ 196.00
Mini In The Box

What's in the box:GPS Tracker1; Powered by:Battery; GPS Card Slot:TF Card; Function:Vibration Alarm,Over Speed Alarm,Location Record,Smart Anti-Lost; Compatibility:Car Anti Theft,Pet Anti Lost,Child Anti Lost; Product type:GPS Tracker; Net Weight(kg):0.05,0.05; Listing Date:05/30/2016; Network type:GPRS,GSM

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New Mini GSM Gprs GPS Tracker Anti-Lost Tracking Locator Device Alarm for Pets Elders Children Cars
HK$ 376.00
Tomtop

New Mini GSM Gprs GPS Tracker Anti-Lost Tracking Locator Device Alarm for Pets Elders Children Cars

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Tencent Kids Locator Q7S-06 Portable Mini GPS Tracker SOS Button GEO-Fence Alarm GPS LBS WiFi 3 Ways Accurate Positioning for Kids
HK$ 332.00
Tomtop

Features: Wide Using: Suitable for kid, elder, pet, car and package. After School Monitoring: Tracking your kids, see them walking on map, safe and convenient. SOS Button: In case of emergency, elders and kids can press SOS button, preset phone number will be connected automatically. 3 Ways Accurate Positioning: LBS+GPS+WiFi three ways accurate positioning, Tencent kids locator auto adopts quickest locating mode according to environment. GEO-Fence Alarm: Your phone will alert when pets out of the circle on map. Easy Operation: Operates only on smartphones, simple and convenient operation, no SMS commands. Long-lasting Battery: 500mAh big battery capacity, smart auto saving power, offers about 7 days long life standby.

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Mini Pet GPS Tracker Ip66 Waterproof Smart Location Free APP with Collar for Pets and Cars
HK$ 266.00
Tomtop

Features: SMS and Gprs dual mode or switch; Real-time location tracking. GPS history route record, can the real-time view in map; A-Gps function, receive GPS signals faster. Vibration alarm, handset search function and cross-border alarm. Electronic fence, you can set a fixed area, it will alarm if pet is beyond this fixed area. Overspeed alarm: You can set up a speed range to monitor the target. It will alarm if the target speed is over the set speed.

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Car GPS Tracker Magnetic GPS Locator Voice Monitoring Standby 90 Days for Person and Vehicle
HK$ 253.00
Tomtop

Features: Long Standby Time: With a 3.7V 3400mAh Li-ion battery, can standby up to 90 days. Powerful Magnetic: Built-in powerful magnets, can be very easily installed. Remote Voice Monitoring: Touch the voice icon, it will call you to monitor the voice around the device! Shake Alarm: It will send message to the admin number when the device get shocked. History Route Playback: You can track the history route of the device up to 3 months via both the web platform and App!

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Mini Global GPS Tracker Real Time Locator Lbs/gsm/gprs 4 BandsTracking Anti-theft for Motorcycle
HK$ 100.00
Tomtop

Features:Mini global Lbs/gsm/gprs real time tracker for motorcycle, use standard GSM SIM card (Not included).GSM Frequency suppport 850/900/1800/1900Mhz (global use).Support both Gprs LBS (Location based service) positioning.SMSWeb portal tracking available.Bulid-in vibration sensor, smart anti-theft.Moving alarm and monitoring.Wide input voltage range: DC 9-24V.Simple operation and stable performance.Mini size and ultra lightweight.

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Intelligent Mini GPS Tracker
HK$ 204.00
Tomtop

Intelligent Mini GPS Tracker

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How Does the GPS System Work

GPS has become a staple service that many Hong Kongns are utilising today. Many Hong Kongn drivers use GPS devices to guide them on the best routes to use to reach a designated destination. GPS systems are accessible via our smartphones and a variety of handheld GPS devices. Some cars also have come with built-in GPS systems for you to navigate your trips easily.

Despite being used almost every day, not many people know how the GPS works. Most people know that GPS, short for Global Position System, basically uses satellites to determine the position of your location and the destination you are heading to. Here is an in-depth insight into how the global positioning system (GPS) works:

Founding of the Global Positioning System

The Global Positioning System, also known as NavStar was built by the US military system and has been fully operational since 1995. The system was initially developed for military navigation but now anyone with a GPS device, be it a mobile phone or a handheld GPS unit, can receive the radio signals broadcasted by the satellites from outer space. The GPS system currently has 31 active satellites orbiting the Earth from 20,000 kilometres away, making two complete orbits a day. Not all are used though as some are spare satellites in case one malfunctions.

Concept Behind the GPS System

GPS uses a lot of complex technology to operate but the concept is relatively simple to understand. The satellites are arranged in such a way that no matter where you are on the planet, there will be at least four GPS satellites that are “visible” at any point of time. Each of these satellites will transmit information about its position and the current time at regular intervals. Your GPS receiver which will analyse and calculate the high-frequency radio signals emitted by the GPS satellites to determine the distance of the satellite based on how long it took for the messages to arrive. Once your device is able to calculate how far away at least three satellites are, it can pinpoint your location through a simple mathematical principle known as trilateration.

Trilateration

To understand trilateration, you need to imagine yourself standing somewhere on Earth with three satellites in the sky above you. If you are able to know the distance you are from one satellite, say Satellite A, then you will be able to build an imaginary circle with the distance you are from the satellite as the radius. By doing the same thing for satellite B and C, you can work out your location by defining a point where these three circles intersect. This is how your GPS receiver determines your location with the only difference is that it uses overlapping spheres instead of circles.

Although an approximate position can be determined with only three satellites but to improve accuracy and obtain precise altitude accuracy, having information from four or more satellites will be ideal. Planning to get yourself a GPS tracker? Brands like Garmin and OEM manufacture reliable GPS units that you can use to ensure that you reach your destination without any hassle.