1. Bluetooth GPS receiver: To display routes and maps the Bluetooth GPS receiver requires a PDA, laptop or even a Smartphone. In fact the receiver does not have a display screen, and can work in unison with another device, provided the display device is loaded with the requisite software.

However its performance is so excellent. That is why it became increasingly popular with the tech-savvy generation. Even it can interface with different types of Bluetooth-enabled computers and provide high quality voice directions, color screens and color maps also. In fact it is ideal for steering and driving instructions, but not for cross-country hiking.

2. Standalone GPS receiver: There are diverse shapes and sizes and range of the standalone GPS receivers available in form of basic monochrome screen types to full-color handheld and car navigation systems. They are most appropriate to work in tough and trying conditions.

These receivers can be used during hiking expeditions and in water sports like sailing due to water resistant. You can also these devices for activities like jogging and cycling. The biggest advantage of these receivers is that it can be used to monitor time, distance, speed and heart rate. Even you can employ them to drop weight or improve your fitness.

Make sure that you should be checked about the memory of a standalone GPS receiver while buying them. There are different types of memory capacity like Receivers with 1 MB to 4 MB and receiver with 2 MB to 5 MB of space. But it will be good idea to choose receiver with 2 MB to 5 MB of space because it has more space than other.

3. Compact Flash GPS expansion cards: Before the arrival of Bluetooth GPS receivers these cards were very popular that time. You can plug into the Compact Flash card slots on handhelds and notebook computers. However these cards were available affordably, and can perform most of the functions that Bluetooth receivers can do.

They will effective with those devices that had a Compact Flash slot. The advantage of this card was that they worked very well with PDAs, especially when the aerial pointed skywards. However the popularity of GPS expansion cards has been going down in recent days because their availability was constraint.

4. Combo devices: There are some manufacturers who have introduced GPS chipsets for devices like Pocket PC like Mitac, Holux and even Garmin. This makes these devices similar to standalone GPS receivers but more versatile. You can use this as a personal diary as well as a GPS receiver.