Linkifun™ MT21 7インチ Android 13 オートバイ用ナビゲーション画面（ワイヤレスCarPlay／Android Auto、外部GPS、Wi-Fi対応）

I bought this product because I was looking for a device that natively ran that ran MyRoute App planning and navigation application suite. I live in the UK but ride a motorcycle all over Central and Western Europe and was looking for an alternative navigation device to my Garmin Zumo XT which always insists on altering routes from that planned. To a motorcyclist the route to be followed is at least as important as the destination, if not more so. The Garmin is always a fight to get it to follow the pre-planned route even when it is a track!
So, I was looking for a navigation device that did not involve my smart phone. After some research I found the Linkifun website and ordered the MT21. It was delivered quickly and well packaged, the only hiccup being they are limited to delivering to the UK mainland and not the extremities so alternatives may be needed depending where you live. The device is solidly made, comes with all the parts described including the very useful free add-ons of a microSD card and USB (A) microSD card holder for PC connection.
The device runs one of the later versions of the Android operating system and once logged into a Google account has full access to the Google store, providing access to the full range of Android compatible applications. I tried Car Play and that works really well.
The internet connection works very well, at least on WiFi 5, I have not tried the later variants
I haven't any experience of the other pre-installed applications or any other downloadable apps. As I said above I wanted this to run MyRoute app and that downloaded and ran without any problems at all. Once I logged in to MyRoute app it immediately had access to all my existing routes and favourites. As long as you either have off-line maps downloaded or are prepared to use a phone as an internet connection then the navigation features all work faultlessly.
The screen brightness is perfect and the ability for it to change to a night mode automatically is very helpful.
Now for the negative side of my experience.
The unit is big! I know it says 7" but that refers to the visible screen, there is a border around the screen and the overall devices is 8" diagonally. It comes pre-fitted with a 1" RAM ball for mounting which due to the unit's size seriously limits possible mounting positions so it doesn't obscure any part of the motorcycle standard instrumentation.
It should be possible to power the device via its built-in USB (C) port, the specifications say 5v and 3 amps is required, but I couldn't get this to work as the device stuck on the Android splash screen. It also requires the cover over the USB port and microSD card to be left off if this is the planned way of using the device. Otherwise for use off the motorcycle you access to a 12v power source.
The device is delivered with all the cables needed, and they are definitely long enough with good quality connectors. The unit is specified to be permanently connected to the battery with a 3rd lead that connects to somewhere after the ignition which then starts the device when the ignition is turned on and causes the unit to shutdown when the ignition is turned off. The only strange behaviour is that if the power lead is disconnected from the unit and then re-connected, the device starts up irrespective of the ignition position. This is frustrating. It means that if you do dismount the device for overnight hotel stops you have to undo the mount and disconnect the power and GPS connectors. Re-connecting everything the following morning then means the unit powers up before you are necessarily ready to leave.
I note that though the item description says "built-in GPS" it does come with an external GPS aerial and long lead that needs to be connected to the device for the GPS to work.
The unit also takes around 30 seconds from being turned on to being ready to use, which tends to mean either waiting with the ignition on, or not operating until on the move! Also if you have a motorcycle that takes a big electrical effort to crank the engine the unit can switch off and then start up again once the voltage comes back up.
The touch screen is sensitive and can be used with motorcycle gloves but the screen as delivered is very 'soft'. Mine has scratched quite badly after just a few days use. It is not hindering visibility at the moment but I am reluctant to try and polish these out as it may make the problem worse.
The last challenge I have may be a combination of the Linkifun and MyRoute app but the offline maps take an age to download. The download appears to run at around 0.083 Mbytes per second which is well below my internet connection which is around 10 Mbytes per second.

After watching a couple of reviews I took the plunge and ordered the MT21. It is very generic with the case and you see this design marketed by many other companies. I tested the unit connected to a 12 volt battery first so I could connect to the WI-FI and my phone in comfort. I downloaded Waze and DMD2 apps plus some offline maps so I didn't have to rely on WiFi whilst navigating. It was all easy to do especially for someone who isn't very tech savvy. I went to install it on my bike and the first issue was the handlebar clamp was not big enough for my bars so I tried it on my GPS mount behind the screen on my Himalayan 450. It was too bulky and cumbersome and would not fit plus the ram arm was too long and quite flimsy. In short the mount is very poor compared with the one supplied with my Aoocci C7. I ordered a more suitable mount and started on the wiring. The wiring harness and GPS aerial have really long cables which are difficult to stow away on the bike. The instructions are rudimental and basic with no mention of how to wire it in but with three marked cables you cannot go wrong. Well I wired the black to the battery negative,the yellow(fused) to the battery positive and the red to an ignition switched live. It powered up and I turned off the ignition but the unit remained powered up and the only way I could shut it off was to connect both the red and yellow together and connect both to a switch live so I couldn't see any point to the permanent live wire. Moan over the unit itself is very good and the screen is quick,responsive and bright at 700 nits. The apps work well and although I have no bluetooth headset yet to test voice commands,phone function and music it all looks like it will work seamlessly. The main reason I went for this unit was it's stand alone navigation ability which works fantastic and I can finally get away from expensive Garmin and Tomtom units and use my own choice of navigation apps and plan my own way points and routes in the comfort of my living room. You can also use the free supplied memory card to import GPX route files. All in all I am delighted with my purchase especially at the price. The unit was well packed and sent very quickly.