When you select GOTO Waypoint, it will use the coordinates created from the hummingbird unit which are routed to the Link. The TM will use the TM GPS receiver and position it at those coordinates so boat position may not be same as when the original waypoint was created. It can also be affected by whether you were using an external GPS receiver with the console unit positioned near the transducer location. Without a bow unit and AS GPS HS receiver, it could be difficult to position the boat accurately if fishing a brush pile or specific point.

https://www.humminbird.com/support/f...510.1538326595