The difference between the GPS version and the cellular version is mainly in the function of wireless connection. The gps version refers to wireless access only through WiFi. The cellular version has a built-in mobile module that can access the cellular mobile network.

　　The difference between gps and cellular version

　　1. The difference between the GPS and the cellular version. The former means that this device can only use WiFi as the wireless connection signal and has the gps positioning function; The latter means that on the basis of the former's wireless connection function, it also has a cellular wireless network, which supports the use of eSIM and other methods to access the Internet;

　　2. Generally speaking, there is no difference between the GPS version and the cellular version of the iPad in terms of hardware, except for the network part. In terms of appearance, because the antenna of the mobile network is required, there will be a plastic part or an injection molded separator strip, which is required for the mobile cellular network antenna;

　　3. As for the GPS version of Apple Watch, it can't be used completely without iPhone, so you need to use iPhone network to download updated software and data; In addition, in terms of hardware, the cellular network version has more than 16GB of memory besides being able to access the Internet through eSIM;

　　Analyzing the Advantages and Disadvantages of GPS Positioning from the Working Principle of GPS

　　(1) Advantages:

　　Compared with inertial navigation, GPS navigation does not need to install an inertial platform and its control system. It does not have such high requirements for the working environment. It only requires space satellites, ground base stations, and user terminal equipment to achieve navigation. Moreover, the location covered by the navigation is global, with low civil price, short observation time, no intervisibility between stations, simple instrument operation, and low environmental requirements.

　　Characteristics of GPS compared with other navigation systems

　　Global continuous ground coverage;

　　Multiple functions and high precision;

　　Fast real-time positioning speed;

　　Good anti-interference performance and strong confidentiality.

　　(2) Disadvantages:

　　Since GPS navigation transmits signals through radio, it includes all the disadvantages of radio. It will be affected by many signals, such as radio waves, tall buildings, etc. GPS will be obstructed and reflected by walls, so it cannot directly conduct indoor positioning. There are many errors in GPS navigation: caused by space satellites: satellite clock error, ephemeris error; Signal propagation: ionospheric propagation delay, tropospheric propagation delay, multipath effect error; Receiver generation: receiver noise; Earth rotation; System error;

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