No, the dimension of garmin overlander is 7.84" W x 4.79" H x 0.93" D (19.9 x 12.2 x 2.4 cm), and this RZR Tablet Holder will fit for mobile phones, tablets and GPS with a length or width within the range of 130mm (5.1inch)-204mm (8inch) and thickness within 18mm (0.7inch), the thickness is not big enough for Garmin overlander.