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Globaltop HG-100 Bluetooth GPS HUD Review 2 July 2007

Review by Darren Griffin


Globaltop HG-100 GPS HUD Speedmeter

Globaltop HG-100 Bluetooth HUD GPS Speedometer

It has been a while since a bluetooth GPS truly brought a new feature to the table. So when I first saw Globaltop's HG-100 at CeBIT in Hannover back in March it immediately caught my eye.


Although unremarkable as a GPS it offers one new function never before seen, a Head Up Display (HUD) speedometer and the demonstration model, set up in a small briefcase with an angled pane of glass representing the windscreen gave a good example of how this would be seen by the driver. It is also a standard bluetooth GPS of course and as it contains a rechargeable battery it can be used away from the vehicle to provide GPS location information to a laptop, Pocket or Smart phone.


Now my car is an Australian Spec vehicle and as such the speedometer is in KMH (no inner MPH Scale like we get here) so the opportunity to have a nice clear speedometer readout in MPH was one not to be missed and I must confess that being a gadget obsessive had some bearing on it too so I requested a review sample as soon as production units were available.


What's In The Box?

Open the box and you'll find everything you need and a few extras that you may not immediately recognise.


HG-100 Package Contents


A. User Manual on CD
B. Hardware Quick Installation Guide
C. Two pieces of window film
D. Double side sticker
E. Mounting Plate
G. Car Charger


To enable the HUD display to focus on the windscreen and to improve contrast a sheet of tinted window film needs to be applied to the inside of the screen at the location that you choose to mount the HUD GPS. Globaltop helpfully supply two pieces because if you're like me you'll rush the first installation and bodge the application of the film! If you follow the very thorough installation guide you'll get a great result, I did the second time around!


Globaltop also supply a mounting plate and adhesive pad. The base of the HG-100 contains a magnet and once the mounting plate has been stuck to the dash it can be installed and removed very quickly and more importantly will not slide across the dash.


Also supplied is a comprehensive printed installation guide, it's nice to see a printed guide here, whilst I can just about accept an electronic manual, for this device with the added complexity of the installation a printed guide is very welcome, just take my advice and read it first!


MediaTek Chipset

The SiRFStarIII Chipset has been discussed in depth many times but Mediatek (MTK) are fast becoming a viable competitor with their latest chipset's being equally capable and more importantly cheaper for the manufacturers to implement.


In use it was difficult to tell this MTK chipset apart from a SiRFStarIII unit I was testing. It did occasionally take a few seconds more to acquire on a cold or warm start but hot starts were immediate. I'm told that the MTK chipset is also less prone to multi path errors than SiRFIII but have not had the opportunity to test and verify this.




NMEA 0183 v3.01 (Default?GGA,GSA,GSV,RMC,VTG)
MTK NMEA Command
Baud Rate
38400,N,8,1 (Default)
Update Rate 5 Hz
Datum WGS84
Channel 32-channel satellites all-in-view tracking


L1, 1575.42MHz
Hot Start 1 second (Average)

Warm Start

34 seconds (Average)

Cold Start 36 seconds (Average)
Reacquisition Time Less than 1 sec (Typical)
Position Accuracy < 3m CEP (50%) without SA (Horizontal)
Sensitivity Tracking?-158 dBm
Power Supply


Power Consumption 100mA(Average)
Battery Life 7~9 hrs with rechargeable Li-Ion Battery
Antenna Type Built-in low noise patch antenna
Bluetooth Class 2, distance up to 10 meters
Dimensions 104.08(W)x20(L)x41.06(H) mm
LED Indicator

Red LED?GPS is fixed or not fixed / Power On

Green LED?Battery Indicator

Blue LED?Bluetooth is connected or not connected

Operating Temperature -10C to + 65C
Storage Temperature -40C to + 85C
Operation Humidity 5%~95%, Non-Condensing
HUD Function Vehicle Speed, Heading, Speed Warning
Availability of HUD DC 5V Plug-in Car charger


HUD Technology

For those of you who don't know, it might be worth a short explanation of what a Head Up display (HUD) actually does. Previously only seen in jet fighters and a few top end BMW's, a HUD allows you to keep your eyes pointed where they should be, through the windscreen, whilst still supplying essential information.


HUD Explained


The technology that enables this in a jet fighter is naturally vastly more complicated involving a complicated arrangement of optics and projectors that presents the data such that to the pilot it appears to 'float' in mid air focused at infinity so that hid eyes don't need to re-adjust to read the data.


Such technology is expensive and of course impossible to implement in a portable after market solution such as that reviewed here but Globaltop have done a great job of ensuring the fundamentals work. The LED display on the top of the unit is reversed and when placed on top of the dash at the base of the windscreen you can see the speed display in the windscreen. It also appears to float but the distance it appears to be outside the screen is dependent on the distance the unit is from the glass itself and so the effect will vary from car to car.


Globaltop HG-100 Diagram


HG-100 Diagram



The HUD functionality has had a large bearing on the design here with a large LED display on the top and the internal GPS antenna to the right.


HG-100 Top View
1. Compass
2. Light Sensor
3. Speed Display
4. KPH/MPH Indicator



HG-100 End View
5. Function Switch (used to set speed units and speed alert)
6. Power socket
7. Power ON/OFF Switch


HG-100 Side View
Status LEDs
Red LED GPS Status
Green LED Power Status
Blue LED Bluetooth Status


HG-100 Bottom View
Magnet Location


The HG-100 has two distinct modes, in-car HUD/Bluetooth GPS and Bluetooth GPS only. The HUD/Bluetooth mode requires external power to function and so can only practically be used in-car when connected to 12v using the supplied power adapter. The HG-100 has an internal non-user replaceable battery and this will power the unit when in Bluetooth GPS mode.


To the left of the speed readout the HG-100 also has a rudimentary compass display which indicates N, E, S & W as well as intermediate points. To the right is a small M or K to indicate MPH or KMH.


A nice feature is the speed alert function. You can easily configure a maximum speed and when this is exceeded the speed readout flashes to alert you.



The first thing you need to do is experiment with the positioning of the unit, ideally it should be directly ahead of the driver and low enough that the display is 'on the bonnet' rather than higher up where it might obstruct your view of the road.


The most crucial part of the installation process here is the application of the tinted window film itself. The simplest and best method of installation is that explained in the installation guide and one which professionals have always used to apply decals. You simply apply a very week solution of water and washing up liquid to the sticky side of the file and the window using an atomiser or spray. Then slide the film into place and when happy with them location use a squeegee or the back of a credit card to remove the water and bubbles. Once done the film will be stuck fast and most importantly air bubble free.


In Use

Press the power button for two seconds to switch the HG-100 on. If external power is available the HUD will illuminate, otherwise just the Bluetooth GPS will operate. Setting the speedometer units to MPH is s simple process using the function button. a 0.5 second press switched between KPH and MPH, a 1 second press shoes the current speed alert setting and a two second press allows you to set the speed at which you wish to be alerted by cycling through with an option to disable this if wished. It would have been nice to also have the option of an audible alert but this is not available.


HG-100 Startup Display
Startup Display


The display is bright enough for any situation and has a light sensor which automatically reduces brightness in darker conditions at night etc. Even on the sunniest day I had no problem clearly reading the display and found it very much quicker to glance at the HUD than to look down at the instrument console.


HG-100 GPS Fix


The only thing that I really missed was the ability to have the unit power ON automatically with the ignition when external power is used. In reality what happens is you switch it on, drive and then when you stop and turn off the ignition the HUD switches off but the Bluetooth GPS continues to operate. If you return to the vehicle before the battery in the unit has completely discharged the HUD will automatically switch back on when ignition power is re-applied. If however, the internal battery has depleted then you have to manually switch it on.


It could I suppose be argued that in the current climate such a device should not be left in the car but i would still prefer the option to have ignition power auto activate the unit.


I also used the HG-100 to drive Memory-Map on my laptop and this worked perfectly.


Short demonstration video



To download and review the quick installation guide click this link (6mb).

To download and review the user manual click this link (1Mb).


NOTE: Adobe Reader Required




The HG-100 is a novel device, as a bluetooth receiver it functions as expected and is small enough to carry in your pocket. As a HUD Speedometer it is superb and functions far better than I had anticipated with a bright clear display that can be easily read in all conditions.


At time of writing this review no UK distributor had been agreed but I will update this as soon as one is appointed.


  • Clear speed readout
  • Compass display
  • MPH/KPH configurable
  • Speed Alert


  • The HG-100 requires external power for the HUD to operate. The device has to be manually switched ON each time you use it. It would be better if it could auto power ON/OFF when external power was supplied/removed i.e. ignition ON/OFF
  • The speed alert function would benefit from an audio alert option
  • The battery is not user replaceable



Manufacturers Web site http://www.gtop-tech.com
Pocket GPS Contributor Darren Griffin


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