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***Tom - Raymarine - Moderator***

Hello natedawgsem,

There's not a lot of difference in performance between them. Having the GPS receiver electronics away from the display is a bit of a lower-noise environment which will probably give slightly higher (even higher) fix accuracy than using GA150 (when you use a GA150 you're attaching a passive antenna, effectively an aerial, to the internal receiver in the display), and the RS150's STNG cable is probably easier to run through the boat (don't ever cut and re-terminate the GA150's cable, and its connector is bigger), but the RS150 is more expensive.

A 3rd alternative for you: the AR200 (http://www.raymarine.com.au/gps/ar200/) combines RS150-quality GPS with the heading sensor from an EV autopilot, also enables ClearCruise Augmented Reality overlay on connected CAM210, CAM220 and M232 video cameras (http://www.raymarine.com.au/clearcruise/), and is not that big a step up from RS150. If you'd thought of adding a visible-light or thermal camera, or don't have heading data from an autopilot, then the AR200 is well worth looking at.

Regards,
Tom