I assume you mean Minnkota Spotlock.
iPilot has Spotlock with its built-in GPS and works with no sonar unit attached or even on the boat. It is not sonar based.
iPilot LINK is the same but can be connected to a Humminbird compatible unit to have Follow-the-Contour with added Lakemaster mapping. Link also gives you more memory space for iTracks and Spotlocks (waypoints).
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, SOLIX 12 SI, 360, RC-1