My Garmin GPS provides these 3 options when navigating to a destination. The 3rd option being the best. The Simrad will follow the first 2 routes but not the 3rd. Garmin tech support confirmed I need a Garmin AP for that. If anyone has gotten that to work, let me know. Seems like it should since all the data is there, but I haven't gotten it to.
Go-To is the standard option for navigating to a destination. When Go To is chosen, the chartplotter or sounder will provide a straight line (as the crow flies) to the destination that may run over land and other obstacles.
Route To is used to create a route to the destination. This option will provide a straight line to the destination and add turns into the route that will avoid land and other obstacles. The route is limited to a certain amount of turns based on the chartplotter or sounder's limitations.
Guide To is only available when using a BlueChart g3 Vision card in a compatible chartplotter or sounder. The Guide To option will turn the navigation line to the destination, avoiding land and other obstacles. This navigation line will be based on the BlueChart g3 mapping data and three user-defined settings on the chartplotter. The three settings are Safe Depth, Safe Height, and Shoreline Distance. The chartplotter will look at all of this information and provide a navigation line avoiding any area that cannot be navigated to the destination.