Garmin Alpha 300i HandheldWhat's the difference between Garmin Alpha 300 vs 300i? The Garmin Alpha 300i Handheld is identical in function and size to the Garmin Alpha 300 Handheld. The difference is the Garmin Alpha 300i has InReach Capability with messaging and SOS service options. An inReach Subscription is required to use inReach. If you do not activate the subscription, the Handheld works just like normal. Garmin Alpha 300i Handheld Features The Alpha 300i handheld