The actual frequencies for the ISS REPEATER are.
Uplink (your transmit freq) 145.990 tone 67.0hz
Downlink (your receive freq) 437.800

The thing is, you will need to compensate for the Doppler effect.
When ISS comes above horizon       437.900 — 145.987
Next.                                                     437.850 — 145.989
Midway through pass. (Highest)       437.800 — 145.990
Next.                                                     437.750 — 145.991
When ISS gets Down to the horizon 437.700 — 145.993

Ron Mahn KI5FR

Here is how to locate the next ISS flyover: