[Skimmer]

For this you should use either streamer or IsPlayerInRangeOfPoint function.

Example

pawn Код:

public OnPlayerEnterCheckpoint(playerid)
{
    if(IsPlayerInRangeOfPoint(playerid, 5.0, X, Y, Z))
    {
        DisablePlayerCheckpoint(playerid);
        SendClientMessage(playerid,COLOR_ORANGE,"Drive back to docks!");
        SetPlayerCheckpoint(playerid,2462.9810,-2097.6760,13.5469, 5.0);
    }
    if(IsPlayerInRangeOfPoint(playerid, 5.0, X, Y, Z))
    {
        DisablePlayerCheckpoint(playerid);
        GivePlayerMoney(playerid,1000);
        SendClientMessage(playerid,COLOR_ORANGE,"You have finished delivery!");
        DestroyVehicle(GetPlayerVehicleID(playerid));
    }
    return 1;
}