UNAUTH PENETRATION OF FOREIGN AIRSPACE.

Narrative

I WAS CLRED FOR TKOF ON RWY 27R FOR A L DOWNWIND DEP TO THE SE FROM GILLESPIE ARPT (SEE); SAN DIEGO; CA. MY GENERAL PLAN WAS TO FLY TO BARRETT (76 DEG RADIAL OF POGG AT 13 DME); THEN NE TO LAKE BARRETT; THEN ALPINE AND RETURN TO SEE. I PASSED E OF THE 3566 FT MOUNTAIN WHICH IS ABOUT 8 NM E OF BROWN FIELD AND MISTAKENLY IDENTED IT AS SAN MIGUEL PEAK. I ALTERED COURSE MORE SE AND CONTINUED UNTIL A TOWN MUCH LARGER THAN I EXPECTED CAME INTO VIEW. I OVERFLEW THE TOWN BEFORE REALIZING THAT IT MUST BE MEXICO. WITHOUT IDENTING THE TOWN (TECATE) AT THE TIME I IMMEDIATELY TURNED N; RETURNED TO GILLESPIE AND LANDED WITHOUT INCIDENT. AT THE SAME TIME I REALIZED THE INTRUSION; I ALSO REALIZED WHY THE MOUNTAIN I THOUGHT WAS SAN MIGUEL SEEMED LARGER THAN INDICATED ON THE MAP. WITHIN MOMENTS THE MESSAGE LIGHT ON MY GPS INDICATED TIJUANA AIRSPACE. I HAVE A NEW JPS MIXTURE CTL SYS THAT I AM GETTING USED TO AND WAS USING LOWER PWR SETTINGS THAN USUAL FOR CRUISE WHICH TOOK MY ATTN FROM NAV. THIS IS AN AREA INTO WHICH I HAD FLOWN ONLY ONCE BEFORE AND THEN WITH ANOTHER PLT SHARING THE DUTIES AND WITH SUBSTANTIAL PREPLANNING. MORE PREPLANNING WAS IN ORDER HERE.