Is there any difference as far as one being more accurate than the other when comparing the GPS that comes in the Helix 10 SI Gen.1, to I-Pilot link 2015 before the new spot lock upgrade. Trying to decide which would be the best place to pull my GPS info from; I do not have the external puck, but the internal GPS on the helix and the I-pilot Link are no more than three feet away from my transducer.