Living on the north side of the DMZ myself, I'm curious as to the section of the Criminal Code that says unattended guns on a cart are a violation.
I just returned from the range where I 'owned' the place - not a soul on the property besides me. This is not an uncommon thing any given morning during the week. With me were my Tavor and AR15, the former non-restricted, the latter restricted. For the benefit of this who live south of the DMZ, that means one can go anywhere you can take a hunting rifle, the other must be registered, transported as a handgun and discharged only on an "approved range".
Club policy requires locking the gate behind you, but people can and have walked under the gate from the highway. Some are members who have forgotten their gate key, others not.
I walked out to 200m several times to patch paper and paint steel over a two hour period. On every occasion my firearms were "unattended" by any definition. My only option would have been to apply trigger locks, put them in locked cases and lock my vehicle each and every time I went downrange.
I have also had occasion to leave my .44 M29 (and other handguns) "unattended" when going downrange to score and/or patch. Any shooter NOT going down range could scoop a gun and be gone in the time it would take for me to come back from 100m.
We have tried to convince our Exec that the only safe place for a handgun is in a holster, but the only people who can do so are the IPSC/IDPA/CAS shooters and those who have been checked out as "holster certified". On the 500m rifle range (the only range where you can shoot past 100m), holsters are not allowed - period.
It has also been decreed that NO mags may be carried (loaded or unloaded) in a "SAFE" area, unless it is at a sanctioned match.
It it's a practice or club level shoot, the rule applies. It has yet to be determined how that will apply to a CAS shooter with 25 rds on his belt and a bandolier of 12 ga shells.
IPSC says that NO live ammo or dummies may be handled in a "SAFE" area. Empty mags may be inserted to drop test, etc.
Local rules aside, when the law requires more restrictive measures, I think there will be many guilty of violations in the name of common sense and efficiency. Bad law will encourage people to shoot on Crown land or private property instead of an "approved range".
At any CAS event I have attended, I have been very casual about leaving my long guns in my cart "unattended" during breaks, but either lock up my handguns or wear them, depending upon the level of paranoia of the host club.