B737-700
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 205
Communication Breakdown; Situational Awareness
ATC Issue All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance
Human Factors
We were cleared to JAYXX and we read back GHATS. Both are on the route and they both sound very similar. The Controller never said we read back the wrong waypoint; and we never thought twice. We were asked (after a period of time) our last assigned waypoint. It was at this point we told ATC GHATS and she told us we read the wrong one back; probably; but it was ok. After discussing this with the Captain we both agreed they sound very similar and probably shouldn't be so close. Nonetheless it was my responsibility and I was wrong.Preventative Measures: New waypoint name or not so close they sound very similar.
B737-700 FO reported navigating to the wrong (similar-sounding) fix because of a misunderstanding with ATC.