Garmin (GRMN, news, chart, volatility) is seeing bullish order flow. 7,800 calls have traded the day, compared to 1,200 put options. The jump in options volume appears to be related to takeover chatter, with Microsoft (MSFT) being mentioned as a possible suitor. GRMN shares aren’t doing much, trading down 45 cents to $22 and off 3.6 percent from the best levels of the day ($22.83). In the options marekt, some premium buying is being seen. 3,660 of the November 25 calls have traded, with 79 percent trading offerside. Implied volatility is also higher, up 88 from 80 on Friday.