Garmin GPSmap 741xs (M3BPGT00)

Per the FCC photos...
 * The device is using a Texas Instruments SoC
 * There is a Marvell 88E6060 FE Switch onboard
 * The WLAN chip is modularized, perhaps 88W8688 or Broadcom based

On TheGPSStore.com
 * Garmin GPSMAP 741xs Touch Screen GPS Sounder