It looks like the OP is flying in Canada. However, if he wants to fly in the US, he'll of course need to follow the same rules as other hobbyists in the US.
Per the Special Rule for Model Aircraft, the aircraft must be flown within visual line of sight of the person operating the aircraft. That means
(1) the aircraft must be visible at all times to the operator;
(2) that the operator must use his or her own natural vision to observe the aircraft; and
(3) people other than the operator may not be used in lieu of the operator for maintaining visual line of sight. Under the criteria above, visual line of sight would mean that the operator has an unobstructed view of the model aircraft. To ensure that the operator has the best view of the aircraft, the statutory requirement would preclude the use of vision-enhancing devices, such as binoculars, night vision
goggles, powered vision magnifying devices, and
goggles designed to provide a “first-person view” from the model. If interested, you can find more details
here.
The only way to legally fly with a spotter is if you have a Section 333 Exemption, a Certificate of Waiver or Authorization
(COA), are flying commercially under FAA Part 107, or you're flying indoors
(which is not regulated by the FAA).