I first bought their inreach version 1 when they were first launched which I found a bit frustrating due to the slow speed of sending messages. I upgraded to the mk2 which I gave to my daughter who hunts in remote wilderness areas. Again it's slow and you really need clear view of the sky to get the messages out.
I also bought a 67i when they first came out a couple of years ago. Apparently the power is the same, however messages are normally sent within 15 seconds. I own various Garmin products which interact with the inreach such as my 8412 and 8410 while in my boat.
There are a few features which really made the 67i worth the extra money.
Firstly 160hrs battery time.
Door to door road and off-road mapping.
Detailed marine charts, with marine park boundaries.
State and national park boundaries, ideal for hunting.
The biggest winner for me is being able to download free aerial maps like those found on google earth.
When I travel on friends boats Im able to take my own gps and all my fishing marks from my own units.
I also do remote offshore boating trips where I have no phone or radio reception for several weeks at a time, so being able to get detailed weather forecasts for my exact location allow me to avoid cyclones or any other extreme weather.
Im about to do a remote mountain river trip which should take around 4 days, which Ive downloaded the entire river section, showing all the sets of rapids, areas that look ok to camp and hunt from, even pre planned where I will target fish.
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