Posted: Thu Jul 31, 2008 6:16 pm-
On your NEXUS card:
On your first entry to the US - land, sea or air, you MUST use your passport and your F-1 to enter the US instead of your NEXUS card. Your F-1 has to be stamped, along with your passport, as if you were entering the US on an F-1 under normal circumstances (i.e. without your NEXUS).
(Note that your NEXUS card will most likely be suspended as you obtain your F-1 visa. You have to go to the NEXUS office to reactivate your card with the newly obtained F-1 status - see below.)
DO NOT enter the US on a NEXUS card and then proceed to secondary inspection and get your F-1 stamped. (This means you can't use the NEXUS lanes on land and air at all - you have to line up

) Doing so will most likely have your NEXUS card revoked as they treat this as a NEXUS term violation.
You are then REQUIRED to go to a NEXUS office at your earliest opportunity to show them the stamped F-1 visa and your passport so that they can register you as having an F-1 visa on your NEXUS card. You MUST do this before you use your NEXUS card, or your next entry they're going to treat you as a regular visitor and not a student (i.e. if your NEXUS card hasn't been suspended yet) - and if you go to school with the visitor status, you are in violation with immigration laws. Don't forget to also change your address to that in the US if you are going there to start school.
Note that you still need to have your Passport, I-94 and your F-1 visa in your possession at the time you are using your NEXUS card. Not having them in your possession and the NEXUS guys find that out, you can be denied entry to the US for not possessing proper immigration documentation, and your NEXUS card will be revoked on the spot.
When your F-1 visa expires (i.e. not being renewed), you have to DEPART the US within 30 days of your F-1 expiration so that your F-1 status will be formally removed (i.e. surrender I-94, not doing so = immigration violation). After that, you again have to go to the NEXUS office and let them know that you no longer have an F-1 status.
Hope this (complicated thing) helps.
P.S. if you are flying to a place where there is no NEXUS office around, and an NEXUS office is around your home area and the US border is close by, (say you live in Toronto (go to Buffalo via Peace Bridge for F-1, return to Fort Erie to update NEXUS) or Vancouver (go to Blaine via Pacific Highway for F-1 and update NEXUS) and you are flying to, say, Arizona for school (where there is no NEXUS facilities)), go to the land borders and get your F-1 visa first, and notify the NEXUS guys, before you fly down to the US. That way you can also use your NEXUS card at the airports if they are offered. I believe you can get your F-1 visa up to 30 days in advance of your program start date. If you're flying, you can have your F-1 authorized in the pre-inspection area in Canadian airports, but I don't think they'll let you get out of that area and go to the NEXUS office to update your status before you fly.